From 2888d43ef04a9149569e3c84f716b2460277b055 Mon Sep 17 00:00:00 2001
From: Andrea Mazzini <andrea.mazzini@gmail.com>
Date: Thu, 7 Aug 2014 16:03:43 +0200
Subject: [PATCH 1/4] Updated sample to show NSInternalInconsistencyException

---
 .../CSStickyHeaderFlowLayoutDemo.xccheckout      | 16 ++++++++--------
 .../CSParallaxHeaderViewController.m             | 12 ++++++------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/Project/CSStickyHeaderFlowLayoutDemo.xcworkspace/xcshareddata/CSStickyHeaderFlowLayoutDemo.xccheckout b/Project/CSStickyHeaderFlowLayoutDemo.xcworkspace/xcshareddata/CSStickyHeaderFlowLayoutDemo.xccheckout
index 8082dae..ecd6a08 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo.xcworkspace/xcshareddata/CSStickyHeaderFlowLayoutDemo.xccheckout
+++ b/Project/CSStickyHeaderFlowLayoutDemo.xcworkspace/xcshareddata/CSStickyHeaderFlowLayoutDemo.xccheckout
@@ -5,36 +5,36 @@
 	<key>IDESourceControlProjectFavoriteDictionaryKey</key>
 	<false/>
 	<key>IDESourceControlProjectIdentifier</key>
-	<string>48E17D25-39A0-4DEC-83D6-22CE1C0C0217</string>
+	<string>3F83CD62-5795-4D2C-B544-27696BCFCC55</string>
 	<key>IDESourceControlProjectName</key>
 	<string>CSStickyHeaderFlowLayoutDemo</string>
 	<key>IDESourceControlProjectOriginsDictionary</key>
 	<dict>
-		<key>9FCEA6B4-6BFD-40A1-97AA-77294F4A62B7</key>
-		<string>https://github.com/jamztang/CSStickyHeaderFlowLayout.git</string>
+		<key>5187E190-6F2C-4DE6-BFD9-C50E3089CF95</key>
+		<string>ssh://github.com/andreamazz/CSStickyHeaderFlowLayout.git</string>
 	</dict>
 	<key>IDESourceControlProjectPath</key>
 	<string>Project/CSStickyHeaderFlowLayoutDemo.xcworkspace</string>
 	<key>IDESourceControlProjectRelativeInstallPathDictionary</key>
 	<dict>
-		<key>9FCEA6B4-6BFD-40A1-97AA-77294F4A62B7</key>
+		<key>5187E190-6F2C-4DE6-BFD9-C50E3089CF95</key>
 		<string>../..</string>
 	</dict>
 	<key>IDESourceControlProjectURL</key>
-	<string>https://github.com/jamztang/CSStickyHeaderFlowLayout.git</string>
+	<string>ssh://github.com/andreamazz/CSStickyHeaderFlowLayout.git</string>
 	<key>IDESourceControlProjectVersion</key>
 	<integer>110</integer>
 	<key>IDESourceControlProjectWCCIdentifier</key>
-	<string>9FCEA6B4-6BFD-40A1-97AA-77294F4A62B7</string>
+	<string>5187E190-6F2C-4DE6-BFD9-C50E3089CF95</string>
 	<key>IDESourceControlProjectWCConfigurations</key>
 	<array>
 		<dict>
 			<key>IDESourceControlRepositoryExtensionIdentifierKey</key>
 			<string>public.vcs.git</string>
 			<key>IDESourceControlWCCIdentifierKey</key>
-			<string>9FCEA6B4-6BFD-40A1-97AA-77294F4A62B7</string>
+			<string>5187E190-6F2C-4DE6-BFD9-C50E3089CF95</string>
 			<key>IDESourceControlWCCName</key>
-			<string>CSStickyHeaderFlowLayout</string>
+			<string>sticky</string>
 		</dict>
 	</array>
 </dict>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
index 34c939c..be84599 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
@@ -24,11 +24,7 @@ - (id)initWithCoder:(NSCoder *)aDecoder {
     if (self) {
         self.sections = @[
                           @{@"Twitter":@"http://twitter.com"},
-                          @{@"Facebook":@"http://facebook.com"},
-                          @{@"Tumblr":@"http://tumblr.com"},
-                          @{@"Pinterest":@"http://pinterest.com"},
-                          @{@"Instagram":@"http://instagram.com"},
-                          @{@"Github":@"http://github.com"},
+                          @{@"Facebook":@"http://facebook.com"}
                           ];
         
         self.headerNib = [UINib nibWithNibName:@"CSParallaxHeader" bundle:nil];
@@ -59,7 +55,11 @@ - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
 }
 
 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
-    return 1;
+    if (section == 0) {
+        return 1;
+    }
+    
+    return 4;
 }
 
 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

From 5d3d38da88ebb474c246a9bda9dda6b31273be78 Mon Sep 17 00:00:00 2001
From: James Tang <j@jamztang.com>
Date: Wed, 17 Sep 2014 08:22:42 +0800
Subject: [PATCH 2/4] fixes #25 Add BaseCell to fix Xcode 6 GM auto layout
 warning

---
 .../project.pbxproj                           |  6 +++++
 .../CSAlwaysOnTopHeader.h                     |  4 +++-
 .../CSAlwaysOnTopHeader.xib                   | 23 +++++++------------
 .../CSBaseCollectionViewCell.h                | 13 +++++++++++
 .../CSBaseCollectionViewCell.m                | 18 +++++++++++++++
 Project/CSStickyHeaderFlowLayoutDemo/CSCell.h |  3 ++-
 .../CSGrowHeader.xib                          | 12 ++++++----
 .../CSParallaxHeader.xib                      | 14 +++++++----
 .../CSSearchBarHeader.xib                     | 14 +++++++----
 .../CSSectionHeader.xib                       | 14 +++++++----
 10 files changed, 85 insertions(+), 36 deletions(-)
 create mode 100644 Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.h
 create mode 100644 Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.m

diff --git a/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj b/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj
index 990cfcb..16295b2 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj
+++ b/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj
@@ -12,6 +12,7 @@
 		1A14657818F13832003B643B /* CSStickyParallaxHeaderViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A14657718F13832003B643B /* CSStickyParallaxHeaderViewController.m */; };
 		1A18AE5518F18764003DC8CF /* CSAlwaysOnTopHeader.xib in Resources */ = {isa = PBXBuildFile; fileRef = 1A18AE5418F18764003DC8CF /* CSAlwaysOnTopHeader.xib */; };
 		1A18AE5818F1947B003DC8CF /* CSAlwaysOnTopHeader.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A18AE5718F1947B003DC8CF /* CSAlwaysOnTopHeader.m */; };
+		1A7557EA19C8FE95006F894E /* CSBaseCollectionViewCell.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A7557E919C8FE95006F894E /* CSBaseCollectionViewCell.m */; };
 		1AC0D88518AA38380072B3F1 /* CSParallaxHeader.xib in Resources */ = {isa = PBXBuildFile; fileRef = 1AC0D88418AA38380072B3F1 /* CSParallaxHeader.xib */; };
 		1AC0D88718AA39B50072B3F1 /* MapKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1AC0D88618AA39B50072B3F1 /* MapKit.framework */; };
 		1AC0D88918AA3AF80072B3F1 /* CSSearchBarHeader.xib in Resources */ = {isa = PBXBuildFile; fileRef = 1AC0D88818AA3AF80072B3F1 /* CSSearchBarHeader.xib */; };
@@ -55,6 +56,8 @@
 		1A18AE5418F18764003DC8CF /* CSAlwaysOnTopHeader.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CSAlwaysOnTopHeader.xib; sourceTree = "<group>"; };
 		1A18AE5618F1947B003DC8CF /* CSAlwaysOnTopHeader.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CSAlwaysOnTopHeader.h; sourceTree = "<group>"; };
 		1A18AE5718F1947B003DC8CF /* CSAlwaysOnTopHeader.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = CSAlwaysOnTopHeader.m; sourceTree = "<group>"; };
+		1A7557E819C8FE95006F894E /* CSBaseCollectionViewCell.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CSBaseCollectionViewCell.h; sourceTree = "<group>"; };
+		1A7557E919C8FE95006F894E /* CSBaseCollectionViewCell.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = CSBaseCollectionViewCell.m; sourceTree = "<group>"; };
 		1AC0D88418AA38380072B3F1 /* CSParallaxHeader.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CSParallaxHeader.xib; sourceTree = "<group>"; };
 		1AC0D88618AA39B50072B3F1 /* MapKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MapKit.framework; path = System/Library/Frameworks/MapKit.framework; sourceTree = SDKROOT; };
 		1AC0D88818AA3AF80072B3F1 /* CSSearchBarHeader.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CSSearchBarHeader.xib; sourceTree = "<group>"; };
@@ -207,6 +210,8 @@
 		1AFE098F187D685200CA880A /* Cell */ = {
 			isa = PBXGroup;
 			children = (
+				1A7557E819C8FE95006F894E /* CSBaseCollectionViewCell.h */,
+				1A7557E919C8FE95006F894E /* CSBaseCollectionViewCell.m */,
 				1AFE0990187D688300CA880A /* CSCell.h */,
 				1AFE0991187D688300CA880A /* CSCell.m */,
 				1A18AE5618F1947B003DC8CF /* CSAlwaysOnTopHeader.h */,
@@ -367,6 +372,7 @@
 				1A0117F418AD036800AC836F /* CSGrowHeaderViewController.m in Sources */,
 				1A14657818F13832003B643B /* CSStickyParallaxHeaderViewController.m in Sources */,
 				1AC0D88C18AA3B300072B3F1 /* CSLockedHeaderViewController.m in Sources */,
+				1A7557EA19C8FE95006F894E /* CSBaseCollectionViewCell.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.h b/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.h
index 935c6bd..d72a7c1 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.h
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.h
@@ -7,10 +7,12 @@
 //
 
 #import "CSCell.h"
+#import "CSBaseCollectionViewCell.h"
 
-@interface CSAlwaysOnTopHeader : CSCell
+@interface CSAlwaysOnTopHeader : CSBaseCollectionViewCell
 
 @property (weak, nonatomic) IBOutlet UILabel *titleLabel;
 @property (weak, nonatomic) IBOutlet UISearchBar *searchBar;
 
 @end
+
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.xib b/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.xib
index 99281b7..684d1d7 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.xib
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSAlwaysOnTopHeader.xib
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="5053" systemVersion="13C64" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6245" systemVersion="14A361c" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
+        <deployment defaultVersion="1792" identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
@@ -15,22 +16,18 @@
                 <subviews>
                     <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="baby-blur" translatesAutoresizingMaskIntoConstraints="NO" id="3y9-9q-T6E">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="404"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                     </imageView>
                     <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="twt-q2-bnj">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="404"/>
-                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <subviews>
                             <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Success Baby" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="4Hg-Bk-Mdr">
                                 <rect key="frame" x="95" y="26" width="130" height="25"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <fontDescription key="fontDescription" name="HelveticaNeue-Light" family="Helvetica Neue" pointSize="21"/>
                                 <color key="textColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                 <nil key="highlightedColor"/>
                             </label>
                             <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="infoLight" showsTouchWhenHighlighted="YES" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="O1O-Nr-Erp">
                                 <rect key="frame" x="283" y="28" width="22" height="22"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <color key="tintColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                             </button>
                         </subviews>
@@ -38,37 +35,30 @@
                     </view>
                     <view clipsSubviews="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="rQM-dq-2oY">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="426"/>
-                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <subviews>
                             <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="A9v-QW-9fF">
                                 <rect key="frame" x="0.0" y="60" width="320" height="366"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <subviews>
                                     <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Success Baby" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="5dP-Im-gAY">
                                         <rect key="frame" x="20" y="204" width="280" height="37"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="27"/>
                                         <color key="textColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                         <nil key="highlightedColor"/>
                                     </label>
                                     <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="12345 FOLLOWERS BY SOMEBODY" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="3Zp-qf-qfV">
                                         <rect key="frame" x="49" y="276" width="223" height="17"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="13"/>
                                         <color key="textColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                         <nil key="highlightedColor"/>
                                     </label>
                                     <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleAspectFill" fixedFrame="YES" image="baby-clear" translatesAutoresizingMaskIntoConstraints="NO" id="hfE-49-EbU">
                                         <rect key="frame" x="90" y="56" width="140" height="140"/>
-                                        <autoresizingMask key="autoresizingMask"/>
                                     </imageView>
                                     <pageControl opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" numberOfPages="3" translatesAutoresizingMaskIntoConstraints="NO" id="DTs-fp-mqw">
                                         <rect key="frame" x="141" y="287" width="39" height="37"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                     </pageControl>
                                     <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="ABz-uU-Hc5">
                                         <rect key="frame" x="123" y="244" width="74" height="24"/>
-                                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="12"/>
                                         <inset key="titleEdgeInsets" minX="0.0" minY="2" maxX="0.0" maxY="0.0"/>
                                         <state key="normal" title="FOLLOW" backgroundImage="border">
@@ -80,7 +70,6 @@
                                     </button>
                                     <searchBar contentMode="redraw" fixedFrame="YES" searchBarStyle="minimal" placeholder="Search" translatesAutoresizingMaskIntoConstraints="NO" id="SPW-Vr-XZC">
                                         <rect key="frame" x="20" y="0.0" width="280" height="44"/>
-                                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMaxY="YES"/>
                                         <color key="barTintColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                         <textInputTraits key="textInputTraits"/>
                                     </searchBar>
@@ -101,7 +90,6 @@
                     </view>
                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="QhM-hK-CzL">
                         <rect key="frame" x="40" y="383" width="240" height="44"/>
-                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <color key="backgroundColor" red="0.51462384379228143" green="0.83999645709991455" blue="0.05969499998924066" alpha="1" colorSpace="calibratedRGB"/>
                         <constraints>
                             <constraint firstAttribute="height" constant="44" id="wrB-5J-3fl"/>
@@ -150,4 +138,9 @@
         <image name="baby-clear" width="400" height="400"/>
         <image name="border" width="24" height="24"/>
     </resources>
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4"/>
+    </simulatedMetricsContainer>
 </document>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.h b/Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.h
new file mode 100644
index 0000000..4c0f64b
--- /dev/null
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.h
@@ -0,0 +1,13 @@
+//
+//  CSBaseCollectionViewCell.h
+//  CSStickyHeaderFlowLayoutDemo
+//
+//  Created by James Tang on 17/9/14.
+//  Copyright (c) 2014 Jamz Tang. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface CSBaseCollectionViewCell : UICollectionViewCell
+
+@end
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.m b/Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.m
new file mode 100644
index 0000000..c5456c6
--- /dev/null
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSBaseCollectionViewCell.m
@@ -0,0 +1,18 @@
+//
+//  CSBaseCollectionViewCell.m
+//  CSStickyHeaderFlowLayoutDemo
+//
+//  Created by James Tang on 17/9/14.
+//  Copyright (c) 2014 Jamz Tang. All rights reserved.
+//
+
+#import "CSBaseCollectionViewCell.h"
+
+@implementation CSBaseCollectionViewCell
+
+- (void)setBounds:(CGRect)bounds {
+    [super setBounds:bounds];
+    self.contentView.frame = bounds;
+}
+
+@end
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSCell.h b/Project/CSStickyHeaderFlowLayoutDemo/CSCell.h
index 68c8e5b..5085a86 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSCell.h
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSCell.h
@@ -7,8 +7,9 @@
 //
 
 #import <UIKit/UIKit.h>
+#import "CSBaseCollectionViewCell.h"
 
-@interface CSCell : UICollectionViewCell
+@interface CSCell : CSBaseCollectionViewCell
 
 @property (weak, nonatomic) IBOutlet UILabel *textLabel;
 
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeader.xib b/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeader.xib
index 35c2c8a..b6a541e 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeader.xib
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeader.xib
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="5053" systemVersion="13C64" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6245" systemVersion="14A361c" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
-        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="1eT-rW-DvV">
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="1eT-rW-DvV" customClass="CSBaseCollectionViewCell">
             <rect key="frame" x="0.0" y="0.0" width="320" height="200"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
@@ -15,7 +15,6 @@
                 <subviews>
                     <imageView userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="success-baby" translatesAutoresizingMaskIntoConstraints="NO" id="QwK-rZ-0wc">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="200"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                     </imageView>
                 </subviews>
                 <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
@@ -32,4 +31,9 @@
     <resources>
         <image name="success-baby" width="640" height="425"/>
     </resources>
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4"/>
+    </simulatedMetricsContainer>
 </document>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeader.xib b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeader.xib
index 72daea1..8ad9dc2 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeader.xib
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeader.xib
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="4514" systemVersion="13B42" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6245" systemVersion="14A361c" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3747"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
-        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="FPp-yd-DCJ">
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="FPp-yd-DCJ" customClass="CSBaseCollectionViewCell">
             <rect key="frame" x="0.0" y="0.0" width="320" height="200"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
@@ -15,7 +15,6 @@
                 <subviews>
                     <mapView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" mapType="standard" translatesAutoresizingMaskIntoConstraints="NO" id="90X-AK-R19">
                         <rect key="frame" x="0.0" y="-150" width="320" height="500"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <constraints>
                             <constraint firstAttribute="height" constant="500" id="GBA-fH-0rk"/>
                         </constraints>
@@ -31,4 +30,9 @@
             <size key="customSize" width="320" height="200"/>
         </collectionViewCell>
     </objects>
-</document>
\ No newline at end of file
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4"/>
+    </simulatedMetricsContainer>
+</document>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSSearchBarHeader.xib b/Project/CSStickyHeaderFlowLayoutDemo/CSSearchBarHeader.xib
index 06f4506..160d4bb 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSSearchBarHeader.xib
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSSearchBarHeader.xib
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="4514" systemVersion="13B42" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6245" systemVersion="14A361c" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3747"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
-        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="FPp-yd-DCJ">
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="FPp-yd-DCJ" customClass="CSBaseCollectionViewCell">
             <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
@@ -15,7 +15,6 @@
                 <subviews>
                     <searchBar contentMode="redraw" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Ttm-eg-W9y">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMaxY="YES"/>
                         <textInputTraits key="textInputTraits"/>
                     </searchBar>
                 </subviews>
@@ -24,4 +23,9 @@
             <size key="customSize" width="320" height="44"/>
         </collectionViewCell>
     </objects>
-</document>
\ No newline at end of file
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4"/>
+    </simulatedMetricsContainer>
+</document>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSSectionHeader.xib b/Project/CSStickyHeaderFlowLayoutDemo/CSSectionHeader.xib
index 8173f96..ad91035 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSSectionHeader.xib
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSSectionHeader.xib
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="4514" systemVersion="13B42" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6245" systemVersion="14A361c" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3747"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
-        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="yPa-CG-7YQ" customClass="CSCell">
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="yPa-CG-7YQ" customClass="CSBaseCollectionViewCell">
             <rect key="frame" x="0.0" y="0.0" width="320" height="50"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
@@ -15,7 +15,6 @@
                 <subviews>
                     <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="m1k-yV-KgL">
                         <rect key="frame" x="20" y="14" width="280" height="21"/>
-                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                         <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                         <nil key="highlightedColor"/>
@@ -29,4 +28,9 @@
             </connections>
         </collectionViewCell>
     </objects>
-</document>
\ No newline at end of file
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4"/>
+    </simulatedMetricsContainer>
+</document>

From 14f8e79319c0ced52f3cd53caa22322fc558dc59 Mon Sep 17 00:00:00 2001
From: James Tang <j@jamztang.com>
Date: Wed, 17 Sep 2014 08:25:00 +0800
Subject: [PATCH 3/4] Swap item

---
 .../project.pbxproj                           | 14 +++++
 .../Base.lproj/Main.storyboard                | 51 ++++++++++++-------
 .../CSParallaxHeaderViewController.m          | 41 +++++++++++----
 .../NSMutableArray+NSIndexPath.h              | 15 ++++++
 .../NSMutableArray+NSIndexPath.m              | 24 +++++++++
 5 files changed, 116 insertions(+), 29 deletions(-)
 create mode 100644 Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.h
 create mode 100644 Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.m

diff --git a/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj b/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj
index 16295b2..f37a478 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj
+++ b/Project/CSStickyHeaderFlowLayoutDemo.xcodeproj/project.pbxproj
@@ -13,6 +13,7 @@
 		1A18AE5518F18764003DC8CF /* CSAlwaysOnTopHeader.xib in Resources */ = {isa = PBXBuildFile; fileRef = 1A18AE5418F18764003DC8CF /* CSAlwaysOnTopHeader.xib */; };
 		1A18AE5818F1947B003DC8CF /* CSAlwaysOnTopHeader.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A18AE5718F1947B003DC8CF /* CSAlwaysOnTopHeader.m */; };
 		1A7557EA19C8FE95006F894E /* CSBaseCollectionViewCell.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A7557E919C8FE95006F894E /* CSBaseCollectionViewCell.m */; };
+		1A7557ED19C90C08006F894E /* NSMutableArray+NSIndexPath.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A7557EC19C90C08006F894E /* NSMutableArray+NSIndexPath.m */; };
 		1AC0D88518AA38380072B3F1 /* CSParallaxHeader.xib in Resources */ = {isa = PBXBuildFile; fileRef = 1AC0D88418AA38380072B3F1 /* CSParallaxHeader.xib */; };
 		1AC0D88718AA39B50072B3F1 /* MapKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1AC0D88618AA39B50072B3F1 /* MapKit.framework */; };
 		1AC0D88918AA3AF80072B3F1 /* CSSearchBarHeader.xib in Resources */ = {isa = PBXBuildFile; fileRef = 1AC0D88818AA3AF80072B3F1 /* CSSearchBarHeader.xib */; };
@@ -58,6 +59,8 @@
 		1A18AE5718F1947B003DC8CF /* CSAlwaysOnTopHeader.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = CSAlwaysOnTopHeader.m; sourceTree = "<group>"; };
 		1A7557E819C8FE95006F894E /* CSBaseCollectionViewCell.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CSBaseCollectionViewCell.h; sourceTree = "<group>"; };
 		1A7557E919C8FE95006F894E /* CSBaseCollectionViewCell.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = CSBaseCollectionViewCell.m; sourceTree = "<group>"; };
+		1A7557EB19C90C08006F894E /* NSMutableArray+NSIndexPath.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSMutableArray+NSIndexPath.h"; sourceTree = "<group>"; };
+		1A7557EC19C90C08006F894E /* NSMutableArray+NSIndexPath.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "NSMutableArray+NSIndexPath.m"; sourceTree = "<group>"; };
 		1AC0D88418AA38380072B3F1 /* CSParallaxHeader.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CSParallaxHeader.xib; sourceTree = "<group>"; };
 		1AC0D88618AA39B50072B3F1 /* MapKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MapKit.framework; path = System/Library/Frameworks/MapKit.framework; sourceTree = SDKROOT; };
 		1AC0D88818AA3AF80072B3F1 /* CSSearchBarHeader.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CSSearchBarHeader.xib; sourceTree = "<group>"; };
@@ -116,6 +119,15 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		1A7557EE19C90C0D006F894E /* Helper */ = {
+			isa = PBXGroup;
+			children = (
+				1A7557EB19C90C08006F894E /* NSMutableArray+NSIndexPath.h */,
+				1A7557EC19C90C08006F894E /* NSMutableArray+NSIndexPath.m */,
+			);
+			name = Helper;
+			sourceTree = "<group>";
+		};
 		1AFE0949187D677000CA880A = {
 			isa = PBXGroup;
 			children = (
@@ -155,6 +167,7 @@
 				1AFE0964187D677000CA880A /* AppDelegate.h */,
 				1AFE0965187D677000CA880A /* AppDelegate.m */,
 				1AFE0967187D677000CA880A /* Main.storyboard */,
+				1A7557EE19C90C0D006F894E /* Helper */,
 				1AFE098F187D685200CA880A /* Cell */,
 				1AFE098A187D67F500CA880A /* ViewControllers */,
 				1AFE096D187D677000CA880A /* Images.xcassets */,
@@ -368,6 +381,7 @@
 				1AFE096C187D677000CA880A /* CSParallaxHeaderViewController.m in Sources */,
 				1AFE0992187D688300CA880A /* CSCell.m in Sources */,
 				1AFE0966187D677000CA880A /* AppDelegate.m in Sources */,
+				1A7557ED19C90C08006F894E /* NSMutableArray+NSIndexPath.m in Sources */,
 				1AFE0962187D677000CA880A /* main.m in Sources */,
 				1A0117F418AD036800AC836F /* CSGrowHeaderViewController.m in Sources */,
 				1A14657818F13832003B643B /* CSStickyParallaxHeaderViewController.m in Sources */,
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard b/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard
index d665a6b..06d113f 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard
+++ b/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard
@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="5053" systemVersion="13C64" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="4iC-sX-8ZW">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6245" systemVersion="14A361c" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="4iC-sX-8ZW">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
+        <deployment defaultVersion="1792" identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
     </dependencies>
     <scenes>
-        <!--Parallax Header View Controller - Parallax-->
+        <!--Parallax-->
         <scene sceneID="2w0-gB-dZZ">
             <objects>
                 <collectionViewController autoresizesArchivedViewToFullSize="NO" id="8Q4-1y-1uB" customClass="CSParallaxHeaderViewController" sceneMemberID="viewController">
@@ -26,9 +27,16 @@
                                     <rect key="frame" x="0.0" y="0.0" width="320" height="80"/>
                                     <autoresizingMask key="autoresizingMask"/>
                                     <subviews>
+                                        <view alpha="0.0" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="mBK-zA-6o0" userLabel="BackgroundView">
+                                            <rect key="frame" x="0.0" y="0.0" width="320" height="80"/>
+                                            <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
+                                        </view>
+                                        <view alpha="0.0" contentMode="scaleToFill" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="cUa-gm-YIL" userLabel="SelectedBackgroundView">
+                                            <rect key="frame" x="0.0" y="0.0" width="320" height="80"/>
+                                            <color key="backgroundColor" white="0.33333333333333331" alpha="1" colorSpace="calibratedWhite"/>
+                                        </view>
                                         <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Brg-5B-k4R">
                                             <rect key="frame" x="20" y="29" width="280" height="21"/>
-                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                             <nil key="highlightedColor"/>
@@ -37,8 +45,16 @@
                                     <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
                                 </view>
                                 <color key="backgroundColor" white="0.90508097409999999" alpha="1" colorSpace="calibratedWhite"/>
+                                <constraints>
+                                    <constraint firstAttribute="trailing" secondItem="mBK-zA-6o0" secondAttribute="trailing" id="Yiq-1C-D1r"/>
+                                    <constraint firstItem="mBK-zA-6o0" firstAttribute="leading" secondItem="m8y-CO-2rM" secondAttribute="leading" id="rV6-oS-kIz"/>
+                                    <constraint firstItem="mBK-zA-6o0" firstAttribute="top" secondItem="m8y-CO-2rM" secondAttribute="top" id="ujm-RC-lO1"/>
+                                    <constraint firstAttribute="bottom" secondItem="mBK-zA-6o0" secondAttribute="bottom" id="yY1-gZ-rV7"/>
+                                </constraints>
                                 <size key="customSize" width="320" height="80"/>
                                 <connections>
+                                    <outlet property="backgroundView" destination="mBK-zA-6o0" id="vda-TQ-ath"/>
+                                    <outlet property="selectedBackgroundView" destination="cUa-gm-YIL" id="CGm-bi-1Qu"/>
                                     <outlet property="textLabel" destination="Brg-5B-k4R" id="Sl8-WR-RS5"/>
                                 </connections>
                             </collectionViewCell>
@@ -49,7 +65,6 @@
                             <subviews>
                                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WFu-fy-Cah">
                                     <rect key="frame" x="20" y="15" width="280" height="21"/>
-                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                     <color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                                     <nil key="highlightedColor"/>
@@ -65,13 +80,19 @@
                             <outlet property="delegate" destination="8Q4-1y-1uB" id="cpa-XM-pCO"/>
                         </connections>
                     </collectionView>
-                    <navigationItem key="navigationItem" title="Parallax" id="jS5-T5-HZW"/>
+                    <navigationItem key="navigationItem" title="Parallax" id="jS5-T5-HZW">
+                        <barButtonItem key="rightBarButtonItem" title="Swap" id="O5x-zM-DO9">
+                            <connections>
+                                <action selector="swapButtonDidPress:" destination="8Q4-1y-1uB" id="6if-DQ-F53"/>
+                            </connections>
+                        </barButtonItem>
+                    </navigationItem>
                 </collectionViewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="Cud-9j-Qcf" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
             <point key="canvasLocation" x="1389" y="-298"/>
         </scene>
-        <!--Navigation Controller - Parallax-->
+        <!--Parallax-->
         <scene sceneID="EeI-38-cgl">
             <objects>
                 <navigationController definesPresentationContext="YES" id="AzM-uQ-2aj" sceneMemberID="viewController">
@@ -108,7 +129,7 @@
             </objects>
             <point key="canvasLocation" x="353" y="1080"/>
         </scene>
-        <!--Locked Header View Controller - Locked-->
+        <!--Locked-->
         <scene sceneID="DZy-2H-JvM">
             <objects>
                 <collectionViewController autoresizesArchivedViewToFullSize="NO" id="uLh-Vx-yDh" customClass="CSLockedHeaderViewController" sceneMemberID="viewController">
@@ -132,7 +153,6 @@
                                     <subviews>
                                         <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="6Kc-sQ-4xr">
                                             <rect key="frame" x="20" y="29" width="280" height="21"/>
-                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                             <nil key="highlightedColor"/>
@@ -153,7 +173,6 @@
                             <subviews>
                                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="6M6-F4-3vC">
                                     <rect key="frame" x="20" y="15" width="280" height="21"/>
-                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                     <color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                                     <nil key="highlightedColor"/>
@@ -175,7 +194,7 @@
             </objects>
             <point key="canvasLocation" x="1389" y="390"/>
         </scene>
-        <!--Navigation Controller - Locked-->
+        <!--Locked-->
         <scene sceneID="aQj-uf-yJZ">
             <objects>
                 <navigationController definesPresentationContext="YES" id="ne4-Ad-gwb" sceneMemberID="viewController">
@@ -191,7 +210,7 @@
             </objects>
             <point key="canvasLocation" x="984" y="390"/>
         </scene>
-        <!--Grow Header View Controller - Grow-->
+        <!--Grow-->
         <scene sceneID="oPl-lC-Afv">
             <objects>
                 <collectionViewController autoresizesArchivedViewToFullSize="NO" id="JiG-QR-Gdc" customClass="CSGrowHeaderViewController" sceneMemberID="viewController">
@@ -215,7 +234,6 @@
                                     <subviews>
                                         <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="5d0-fd-RNQ">
                                             <rect key="frame" x="20" y="29" width="280" height="21"/>
-                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                             <nil key="highlightedColor"/>
@@ -236,7 +254,6 @@
                             <subviews>
                                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Xb2-G6-DJm">
                                     <rect key="frame" x="20" y="15" width="280" height="21"/>
-                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                     <color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                                     <nil key="highlightedColor"/>
@@ -258,7 +275,7 @@
             </objects>
             <point key="canvasLocation" x="1389" y="1074"/>
         </scene>
-        <!--Navigation Controller - Grow-->
+        <!--Grow-->
         <scene sceneID="jBW-bg-Y93">
             <objects>
                 <navigationController definesPresentationContext="YES" id="EFv-AV-xcM" sceneMemberID="viewController">
@@ -274,7 +291,7 @@
             </objects>
             <point key="canvasLocation" x="984" y="1074"/>
         </scene>
-        <!--Sticky Parallax Header View Controller - Grow-->
+        <!--Grow-->
         <scene sceneID="c5u-NM-LES">
             <objects>
                 <collectionViewController autoresizesArchivedViewToFullSize="NO" id="dcN-xu-3st" customClass="CSStickyParallaxHeaderViewController" sceneMemberID="viewController">
@@ -297,7 +314,6 @@
                                     <subviews>
                                         <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Song 1" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="wVJ-rM-Nrh">
                                             <rect key="frame" x="20" y="9" width="280" height="21"/>
-                                            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                             <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
@@ -318,7 +334,6 @@
                             <subviews>
                                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="PLAYLIST" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="fen-S4-ztg">
                                     <rect key="frame" x="20" y="9" width="280" height="21"/>
-                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                     <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                     <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                     <nil key="highlightedColor"/>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
index be84599..20854a5 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
@@ -9,6 +9,7 @@
 #import "CSParallaxHeaderViewController.h"
 #import "CSCell.h"
 #import "CSStickyHeaderFlowLayout.h"
+#import "NSMutableArray+NSIndexPath.h"
 
 @interface CSParallaxHeaderViewController ()
 
@@ -17,14 +18,20 @@ @interface CSParallaxHeaderViewController ()
 
 @end
 
+
 @implementation CSParallaxHeaderViewController
 
 - (id)initWithCoder:(NSCoder *)aDecoder {
     self = [super initWithCoder:aDecoder];
     if (self) {
         self.sections = @[
-                          @{@"Twitter":@"http://twitter.com"},
-                          @{@"Facebook":@"http://facebook.com"}
+                          @[@{@"Twitter":@"http://twitter.com"}].mutableCopy,
+                          @[
+                              @{@"Facebook":@"http://facebook.com"},
+                              @{@"Facebook":@"http://facebook.com"},
+                              @{@"Facebook":@"http://facebook.com"},
+                              @{@"Facebook":@"http://facebook.com"},
+                              ].mutableCopy,
                           ];
         
         self.headerNib = [UINib nibWithNibName:@"CSParallaxHeader" bundle:nil];
@@ -48,6 +55,19 @@ - (void)viewDidLoad
     
 }
 
+- (IBAction)swapButtonDidPress:(id)sender {
+
+    [self.collectionView performBatchUpdates:^{
+
+        NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:1];
+        NSIndexPath *toIndexPath = [NSIndexPath indexPathForItem:0 inSection:0];
+        [[self mutableArrayValueForKey:@"sections"] moveItemAtIndexPath:indexPath toIndexPath:toIndexPath];
+        [self.collectionView moveItemAtIndexPath:indexPath toIndexPath:toIndexPath];
+    } completion:^(BOOL finished) {
+
+    }];
+}
+
 #pragma mark UICollectionViewDataSource
 
 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
@@ -55,16 +75,12 @@ - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
 }
 
 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
-    if (section == 0) {
-        return 1;
-    }
-    
-    return 4;
+    return [self.sections[section] count];
 }
 
 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
 
-    NSDictionary *obj = self.sections[indexPath.section];
+    NSDictionary *obj = self.sections[indexPath.section][indexPath.item];
 
     CSCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell"
                                                                            forIndexPath:indexPath];
@@ -76,13 +92,13 @@ - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cell
 
 - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
     if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {
-        
-        NSDictionary *obj = self.sections[indexPath.section];
+
+        NSDictionary *obj = self.sections[indexPath.section][indexPath.item];
 
         CSCell *cell = [collectionView dequeueReusableSupplementaryViewOfKind:kind
                                                           withReuseIdentifier:@"sectionHeader"
                                                                  forIndexPath:indexPath];
-        
+
         cell.textLabel.text = [[obj allKeys] firstObject];
 
         return cell;
@@ -96,5 +112,8 @@ - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
     return nil;
 }
 
+- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
+
+}
 
 @end
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.h b/Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.h
new file mode 100644
index 0000000..b594651
--- /dev/null
+++ b/Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.h
@@ -0,0 +1,15 @@
+//
+//  NSMutableArray+NSIndexPath.h
+//  CSStickyHeaderFlowLayoutDemo
+//
+//  Created by James Tang on 17/9/14.
+//  Copyright (c) 2014 Jamz Tang. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface NSMutableArray (NSIndexPath)
+
+- (void)moveItemAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath;
+
+@end
\ No newline at end of file
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.m b/Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.m
new file mode 100644
index 0000000..06560c0
--- /dev/null
+++ b/Project/CSStickyHeaderFlowLayoutDemo/NSMutableArray+NSIndexPath.m
@@ -0,0 +1,24 @@
+//
+//  NSMutableArray+NSIndexPath.m
+//  CSStickyHeaderFlowLayoutDemo
+//
+//  Created by James Tang on 17/9/14.
+//  Copyright (c) 2014 Jamz Tang. All rights reserved.
+//
+
+#import "NSMutableArray+NSIndexPath.h"
+
+
+@implementation NSMutableArray (NSIndexPath)
+
+- (void)moveItemAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath {
+    NSMutableArray *section = self[indexPath.section];
+    id object = section[indexPath.row];
+
+    NSMutableArray *newSection = self[newIndexPath.section];
+
+    [section removeObjectAtIndex:indexPath.row];
+    [newSection insertObject:object atIndex:newIndexPath.row];
+}
+
+@end
\ No newline at end of file

From d68300194eeef761a503bc38dc05f390db1961e5 Mon Sep 17 00:00:00 2001
From: James Tang <j@jamztang.com>
Date: Wed, 17 Sep 2014 08:36:59 +0800
Subject: [PATCH 4/4] ref #18 Toggle translucency of navigation bar to try
 replicate the problem

---
 .../Base.lproj/Main.storyboard                | 66 +++++++++++++++++++
 .../CSGrowHeaderViewController.m              |  5 ++
 .../CSParallaxHeaderViewController.m          |  5 ++
 3 files changed, 76 insertions(+)

diff --git a/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard b/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard
index 06d113f..fdce526 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard
+++ b/Project/CSStickyHeaderFlowLayoutDemo/Base.lproj/Main.storyboard
@@ -56,6 +56,7 @@
                                     <outlet property="backgroundView" destination="mBK-zA-6o0" id="vda-TQ-ath"/>
                                     <outlet property="selectedBackgroundView" destination="cUa-gm-YIL" id="CGm-bi-1Qu"/>
                                     <outlet property="textLabel" destination="Brg-5B-k4R" id="Sl8-WR-RS5"/>
+                                    <segue destination="aFc-v9-b68" kind="push" id="fJO-4g-irA"/>
                                 </connections>
                             </collectionViewCell>
                         </cells>
@@ -353,6 +354,71 @@
             </objects>
             <point key="canvasLocation" x="971" y="1756"/>
         </scene>
+        <!--Grow-->
+        <scene sceneID="c6t-c5-65d">
+            <objects>
+                <collectionViewController autoresizesArchivedViewToFullSize="NO" id="aFc-v9-b68" customClass="CSGrowHeaderViewController" sceneMemberID="viewController">
+                    <collectionView key="view" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" minimumZoomScale="0.0" maximumZoomScale="0.0" keyboardDismissMode="onDrag" dataMode="prototypes" id="tNl-Cz-qaB">
+                        <rect key="frame" x="0.0" y="64" width="320" height="519"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="Ph2-pf-WWr" customClass="CSStickyHeaderFlowLayout">
+                            <size key="itemSize" width="320" height="80"/>
+                            <size key="headerReferenceSize" width="0.0" height="50"/>
+                            <size key="footerReferenceSize" width="0.0" height="0.0"/>
+                            <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
+                        </collectionViewFlowLayout>
+                        <cells>
+                            <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="cell" id="Cic-H5-NvL" customClass="CSCell">
+                                <rect key="frame" x="0.0" y="114" width="320" height="80"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                                <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
+                                    <rect key="frame" x="0.0" y="0.0" width="320" height="80"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                    <subviews>
+                                        <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="2sB-cJ-MrM">
+                                            <rect key="frame" x="20" y="29" width="280" height="21"/>
+                                            <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                            <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
+                                            <nil key="highlightedColor"/>
+                                        </label>
+                                    </subviews>
+                                    <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
+                                </view>
+                                <color key="backgroundColor" white="0.90508097409999999" alpha="1" colorSpace="calibratedWhite"/>
+                                <size key="customSize" width="320" height="80"/>
+                                <connections>
+                                    <outlet property="textLabel" destination="2sB-cJ-MrM" id="cC8-I4-xnr"/>
+                                </connections>
+                            </collectionViewCell>
+                        </cells>
+                        <collectionReusableView key="sectionHeaderView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="sectionHeader" id="Suy-dG-dej" customClass="CSCell">
+                            <rect key="frame" x="0.0" y="64" width="320" height="50"/>
+                            <autoresizingMask key="autoresizingMask"/>
+                            <subviews>
+                                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="rrA-kv-o8w">
+                                    <rect key="frame" x="20" y="15" width="280" height="21"/>
+                                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                    <color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                                    <nil key="highlightedColor"/>
+                                </label>
+                            </subviews>
+                            <color key="backgroundColor" white="0.25" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                            <connections>
+                                <outlet property="textLabel" destination="rrA-kv-o8w" id="e73-Jw-YbD"/>
+                            </connections>
+                        </collectionReusableView>
+                        <connections>
+                            <outlet property="dataSource" destination="aFc-v9-b68" id="3l0-3k-Gie"/>
+                            <outlet property="delegate" destination="aFc-v9-b68" id="Vom-Ep-vIr"/>
+                        </connections>
+                    </collectionView>
+                    <navigationItem key="navigationItem" title="Grow" id="sdJ-Hh-EvM"/>
+                </collectionViewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="IWi-an-1ge" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="1794" y="-298"/>
+        </scene>
     </scenes>
     <simulatedMetricsContainer key="defaultSimulatedMetrics">
         <simulatedStatusBarMetrics key="statusBar"/>
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeaderViewController.m b/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeaderViewController.m
index dd2cf0f..6d7e37c 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeaderViewController.m
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeaderViewController.m
@@ -59,6 +59,11 @@ - (void)viewDidLoad
     
 }
 
+- (void)viewWillAppear:(BOOL)animated {
+    [super viewWillAppear:animated];
+    self.navigationController.navigationBar.translucent = NO;
+}
+
 #pragma mark UICollectionViewDataSource
 
 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
diff --git a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
index 20854a5..d4ca5ac 100644
--- a/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
+++ b/Project/CSStickyHeaderFlowLayoutDemo/CSParallaxHeaderViewController.m
@@ -55,6 +55,11 @@ - (void)viewDidLoad
     
 }
 
+- (void)viewWillAppear:(BOOL)animated {
+    [super viewWillAppear:animated];
+    self.navigationController.navigationBar.translucent = YES;
+}
+
 - (IBAction)swapButtonDidPress:(id)sender {
 
     [self.collectionView performBatchUpdates:^{