├── .gitignore
├── CollectionViewStickyHeaders.xcodeproj
    ├── project.pbxproj
    └── project.xcworkspace
    │   └── contents.xcworkspacedata
├── CollectionViewStickyHeaders
    ├── AppDelegate.swift
    ├── Base.lproj
    │   ├── LaunchScreen.xib
    │   └── Main.storyboard
    ├── CollectionViewController.swift
    ├── HeaderView.swift
    ├── Images.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Info.plist
    └── StickyHeaderFlowLayout.swift
└── README.markdown


/.gitignore:
--------------------------------------------------------------------------------
 1 | # OSX
 2 | .DS_Store
 3 | 
 4 | # Xcode
 5 | #
 6 | build/
 7 | *.pbxuser
 8 | !default.pbxuser
 9 | *.mode1v3
10 | !default.mode1v3
11 | *.mode2v3
12 | !default.mode2v3
13 | *.perspectivev3
14 | !default.perspectivev3
15 | xcuserdata
16 | *.xccheckout
17 | *.moved-aside
18 | DerivedData
19 | *.hmap
20 | *.ipa
21 | *.xcuserstate
22 | 
23 | # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control?
24 | Pods/
25 | Attached/InfoPlist.h


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
  1 | // !$*UTF8*$!
  2 | {
  3 | 	archiveVersion = 1;
  4 | 	classes = {
  5 | 	};
  6 | 	objectVersion = 46;
  7 | 	objects = {
  8 | 
  9 | /* Begin PBXBuildFile section */
 10 | 		B5601F691A6131F8009BA1DA /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5601F681A6131F8009BA1DA /* AppDelegate.swift */; };
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 12 | 		B5601F6E1A6131F8009BA1DA /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = B5601F6C1A6131F8009BA1DA /* Main.storyboard */; };
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 15 | 		B5601F891A6133EE009BA1DA /* StickyHeaderFlowLayout.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5601F881A6133EE009BA1DA /* StickyHeaderFlowLayout.swift */; };
 16 | 		B5601F8B1A6138B9009BA1DA /* HeaderView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5601F8A1A6138B9009BA1DA /* HeaderView.swift */; };
 17 | /* End PBXBuildFile section */
 18 | 
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 21 | 		B5601F671A6131F8009BA1DA /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 22 | 		B5601F681A6131F8009BA1DA /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 23 | 		B5601F6A1A6131F8009BA1DA /* CollectionViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CollectionViewController.swift; sourceTree = "<group>"; };
 24 | 		B5601F6D1A6131F8009BA1DA /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
 25 | 		B5601F6F1A6131F8009BA1DA /* Images.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Images.xcassets; sourceTree = "<group>"; };
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 27 | 		B5601F881A6133EE009BA1DA /* StickyHeaderFlowLayout.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StickyHeaderFlowLayout.swift; sourceTree = "<group>"; };
 28 | 		B5601F8A1A6138B9009BA1DA /* HeaderView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = HeaderView.swift; sourceTree = "<group>"; };
 29 | /* End PBXFileReference section */
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 31 | /* Begin PBXFrameworksBuildPhase section */
 32 | 		B5601F601A6131F8009BA1DA /* Frameworks */ = {
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 34 | 			buildActionMask = 2147483647;
 35 | 			files = (
 36 | 			);
 37 | 			runOnlyForDeploymentPostprocessing = 0;
 38 | 		};
 39 | /* End PBXFrameworksBuildPhase section */
 40 | 
 41 | /* Begin PBXGroup section */
 42 | 		B5601F5A1A6131F8009BA1DA = {
 43 | 			isa = PBXGroup;
 44 | 			children = (
 45 | 				B5601F651A6131F8009BA1DA /* CollectionViewStickyHeaders */,
 46 | 				B5601F641A6131F8009BA1DA /* Products */,
 47 | 			);
 48 | 			sourceTree = "<group>";
 49 | 		};
 50 | 		B5601F641A6131F8009BA1DA /* Products */ = {
 51 | 			isa = PBXGroup;
 52 | 			children = (
 53 | 				B5601F631A6131F8009BA1DA /* CollectionViewStickyHeaders.app */,
 54 | 			);
 55 | 			name = Products;
 56 | 			sourceTree = "<group>";
 57 | 		};
 58 | 		B5601F651A6131F8009BA1DA /* CollectionViewStickyHeaders */ = {
 59 | 			isa = PBXGroup;
 60 | 			children = (
 61 | 				B5601F681A6131F8009BA1DA /* AppDelegate.swift */,
 62 | 				B5601F6A1A6131F8009BA1DA /* CollectionViewController.swift */,
 63 | 				B5601F8A1A6138B9009BA1DA /* HeaderView.swift */,
 64 | 				B5601F881A6133EE009BA1DA /* StickyHeaderFlowLayout.swift */,
 65 | 				B5601F6C1A6131F8009BA1DA /* Main.storyboard */,
 66 | 				B5601F6F1A6131F8009BA1DA /* Images.xcassets */,
 67 | 				B5601F711A6131F8009BA1DA /* LaunchScreen.xib */,
 68 | 				B5601F661A6131F8009BA1DA /* Supporting Files */,
 69 | 			);
 70 | 			path = CollectionViewStickyHeaders;
 71 | 			sourceTree = "<group>";
 72 | 		};
 73 | 		B5601F661A6131F8009BA1DA /* Supporting Files */ = {
 74 | 			isa = PBXGroup;
 75 | 			children = (
 76 | 				B5601F671A6131F8009BA1DA /* Info.plist */,
 77 | 			);
 78 | 			name = "Supporting Files";
 79 | 			sourceTree = "<group>";
 80 | 		};
 81 | /* End PBXGroup section */
 82 | 
 83 | /* Begin PBXNativeTarget section */
 84 | 		B5601F621A6131F8009BA1DA /* CollectionViewStickyHeaders */ = {
 85 | 			isa = PBXNativeTarget;
 86 | 			buildConfigurationList = B5601F821A6131F8009BA1DA /* Build configuration list for PBXNativeTarget "CollectionViewStickyHeaders" */;
 87 | 			buildPhases = (
 88 | 				B5601F5F1A6131F8009BA1DA /* Sources */,
 89 | 				B5601F601A6131F8009BA1DA /* Frameworks */,
 90 | 				B5601F611A6131F8009BA1DA /* Resources */,
 91 | 			);
 92 | 			buildRules = (
 93 | 			);
 94 | 			dependencies = (
 95 | 			);
 96 | 			name = CollectionViewStickyHeaders;
 97 | 			productName = CollectionViewStickyHeaders;
 98 | 			productReference = B5601F631A6131F8009BA1DA /* CollectionViewStickyHeaders.app */;
 99 | 			productType = "com.apple.product-type.application";
100 | 		};
101 | /* End PBXNativeTarget section */
102 | 
103 | /* Begin PBXProject section */
104 | 		B5601F5B1A6131F8009BA1DA /* Project object */ = {
105 | 			isa = PBXProject;
106 | 			attributes = {
107 | 				LastUpgradeCheck = 0610;
108 | 				ORGANIZATIONNAME = "Dative Studios";
109 | 				TargetAttributes = {
110 | 					B5601F621A6131F8009BA1DA = {
111 | 						CreatedOnToolsVersion = 6.1.1;
112 | 					};
113 | 				};
114 | 			};
115 | 			buildConfigurationList = B5601F5E1A6131F8009BA1DA /* Build configuration list for PBXProject "CollectionViewStickyHeaders" */;
116 | 			compatibilityVersion = "Xcode 3.2";
117 | 			developmentRegion = English;
118 | 			hasScannedForEncodings = 0;
119 | 			knownRegions = (
120 | 				en,
121 | 				Base,
122 | 			);
123 | 			mainGroup = B5601F5A1A6131F8009BA1DA;
124 | 			productRefGroup = B5601F641A6131F8009BA1DA /* Products */;
125 | 			projectDirPath = "";
126 | 			projectRoot = "";
127 | 			targets = (
128 | 				B5601F621A6131F8009BA1DA /* CollectionViewStickyHeaders */,
129 | 			);
130 | 		};
131 | /* End PBXProject section */
132 | 
133 | /* Begin PBXResourcesBuildPhase section */
134 | 		B5601F611A6131F8009BA1DA /* Resources */ = {
135 | 			isa = PBXResourcesBuildPhase;
136 | 			buildActionMask = 2147483647;
137 | 			files = (
138 | 				B5601F6E1A6131F8009BA1DA /* Main.storyboard in Resources */,
139 | 				B5601F731A6131F8009BA1DA /* LaunchScreen.xib in Resources */,
140 | 				B5601F701A6131F8009BA1DA /* Images.xcassets in Resources */,
141 | 			);
142 | 			runOnlyForDeploymentPostprocessing = 0;
143 | 		};
144 | /* End PBXResourcesBuildPhase section */
145 | 
146 | /* Begin PBXSourcesBuildPhase section */
147 | 		B5601F5F1A6131F8009BA1DA /* Sources */ = {
148 | 			isa = PBXSourcesBuildPhase;
149 | 			buildActionMask = 2147483647;
150 | 			files = (
151 | 				B5601F6B1A6131F8009BA1DA /* CollectionViewController.swift in Sources */,
152 | 				B5601F691A6131F8009BA1DA /* AppDelegate.swift in Sources */,
153 | 				B5601F891A6133EE009BA1DA /* StickyHeaderFlowLayout.swift in Sources */,
154 | 				B5601F8B1A6138B9009BA1DA /* HeaderView.swift in Sources */,
155 | 			);
156 | 			runOnlyForDeploymentPostprocessing = 0;
157 | 		};
158 | /* End PBXSourcesBuildPhase section */
159 | 
160 | /* Begin PBXVariantGroup section */
161 | 		B5601F6C1A6131F8009BA1DA /* Main.storyboard */ = {
162 | 			isa = PBXVariantGroup;
163 | 			children = (
164 | 				B5601F6D1A6131F8009BA1DA /* Base */,
165 | 			);
166 | 			name = Main.storyboard;
167 | 			sourceTree = "<group>";
168 | 		};
169 | 		B5601F711A6131F8009BA1DA /* LaunchScreen.xib */ = {
170 | 			isa = PBXVariantGroup;
171 | 			children = (
172 | 				B5601F721A6131F8009BA1DA /* Base */,
173 | 			);
174 | 			name = LaunchScreen.xib;
175 | 			sourceTree = "<group>";
176 | 		};
177 | /* End PBXVariantGroup section */
178 | 
179 | /* Begin XCBuildConfiguration section */
180 | 		B5601F801A6131F8009BA1DA /* Debug */ = {
181 | 			isa = XCBuildConfiguration;
182 | 			buildSettings = {
183 | 				ALWAYS_SEARCH_USER_PATHS = NO;
184 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
185 | 				CLANG_CXX_LIBRARY = "libc++";
186 | 				CLANG_ENABLE_MODULES = YES;
187 | 				CLANG_ENABLE_OBJC_ARC = YES;
188 | 				CLANG_WARN_BOOL_CONVERSION = YES;
189 | 				CLANG_WARN_CONSTANT_CONVERSION = YES;
190 | 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
191 | 				CLANG_WARN_EMPTY_BODY = YES;
192 | 				CLANG_WARN_ENUM_CONVERSION = YES;
193 | 				CLANG_WARN_INT_CONVERSION = YES;
194 | 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
195 | 				CLANG_WARN_UNREACHABLE_CODE = YES;
196 | 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
197 | 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
198 | 				COPY_PHASE_STRIP = NO;
199 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
200 | 				GCC_C_LANGUAGE_STANDARD = gnu99;
201 | 				GCC_DYNAMIC_NO_PIC = NO;
202 | 				GCC_OPTIMIZATION_LEVEL = 0;
203 | 				GCC_PREPROCESSOR_DEFINITIONS = (
204 | 					"DEBUG=1",
205 | 					"$(inherited)",
206 | 				);
207 | 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
208 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
209 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
210 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
211 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
212 | 				GCC_WARN_UNUSED_FUNCTION = YES;
213 | 				GCC_WARN_UNUSED_VARIABLE = YES;
214 | 				IPHONEOS_DEPLOYMENT_TARGET = 8.1;
215 | 				MTL_ENABLE_DEBUG_INFO = YES;
216 | 				ONLY_ACTIVE_ARCH = YES;
217 | 				SDKROOT = iphoneos;
218 | 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
219 | 			};
220 | 			name = Debug;
221 | 		};
222 | 		B5601F811A6131F8009BA1DA /* Release */ = {
223 | 			isa = XCBuildConfiguration;
224 | 			buildSettings = {
225 | 				ALWAYS_SEARCH_USER_PATHS = NO;
226 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
227 | 				CLANG_CXX_LIBRARY = "libc++";
228 | 				CLANG_ENABLE_MODULES = YES;
229 | 				CLANG_ENABLE_OBJC_ARC = YES;
230 | 				CLANG_WARN_BOOL_CONVERSION = YES;
231 | 				CLANG_WARN_CONSTANT_CONVERSION = YES;
232 | 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
233 | 				CLANG_WARN_EMPTY_BODY = YES;
234 | 				CLANG_WARN_ENUM_CONVERSION = YES;
235 | 				CLANG_WARN_INT_CONVERSION = YES;
236 | 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
237 | 				CLANG_WARN_UNREACHABLE_CODE = YES;
238 | 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
239 | 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
240 | 				COPY_PHASE_STRIP = YES;
241 | 				ENABLE_NS_ASSERTIONS = NO;
242 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
243 | 				GCC_C_LANGUAGE_STANDARD = gnu99;
244 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
245 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
246 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
247 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
248 | 				GCC_WARN_UNUSED_FUNCTION = YES;
249 | 				GCC_WARN_UNUSED_VARIABLE = YES;
250 | 				IPHONEOS_DEPLOYMENT_TARGET = 8.1;
251 | 				MTL_ENABLE_DEBUG_INFO = NO;
252 | 				SDKROOT = iphoneos;
253 | 				VALIDATE_PRODUCT = YES;
254 | 			};
255 | 			name = Release;
256 | 		};
257 | 		B5601F831A6131F8009BA1DA /* Debug */ = {
258 | 			isa = XCBuildConfiguration;
259 | 			buildSettings = {
260 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
261 | 				INFOPLIST_FILE = CollectionViewStickyHeaders/Info.plist;
262 | 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
263 | 				PRODUCT_NAME = "$(TARGET_NAME)";
264 | 			};
265 | 			name = Debug;
266 | 		};
267 | 		B5601F841A6131F8009BA1DA /* Release */ = {
268 | 			isa = XCBuildConfiguration;
269 | 			buildSettings = {
270 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
271 | 				INFOPLIST_FILE = CollectionViewStickyHeaders/Info.plist;
272 | 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
273 | 				PRODUCT_NAME = "$(TARGET_NAME)";
274 | 			};
275 | 			name = Release;
276 | 		};
277 | /* End XCBuildConfiguration section */
278 | 
279 | /* Begin XCConfigurationList section */
280 | 		B5601F5E1A6131F8009BA1DA /* Build configuration list for PBXProject "CollectionViewStickyHeaders" */ = {
281 | 			isa = XCConfigurationList;
282 | 			buildConfigurations = (
283 | 				B5601F801A6131F8009BA1DA /* Debug */,
284 | 				B5601F811A6131F8009BA1DA /* Release */,
285 | 			);
286 | 			defaultConfigurationIsVisible = 0;
287 | 			defaultConfigurationName = Release;
288 | 		};
289 | 		B5601F821A6131F8009BA1DA /* Build configuration list for PBXNativeTarget "CollectionViewStickyHeaders" */ = {
290 | 			isa = XCConfigurationList;
291 | 			buildConfigurations = (
292 | 				B5601F831A6131F8009BA1DA /* Debug */,
293 | 				B5601F841A6131F8009BA1DA /* Release */,
294 | 			);
295 | 			defaultConfigurationIsVisible = 0;
296 | 		};
297 | /* End XCConfigurationList section */
298 | 	};
299 | 	rootObject = B5601F5B1A6131F8009BA1DA /* Project object */;
300 | }
301 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:CollectionViewStickyHeaders.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Created by Pete Callaway on 10/01/2015.
 3 | //  Copyright (c) 2015 Dative Studios. All rights reserved.
 4 | //
 5 | 
 6 | import UIKit
 7 | 
 8 | @UIApplicationMain
 9 | class AppDelegate: UIResponder, UIApplicationDelegate {
10 | 
11 |     var window: UIWindow?
12 | }
13 | 
14 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/Base.lproj/LaunchScreen.xib:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6214" systemVersion="14A314h" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6207"/>
 5 |         <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
 6 |     </dependencies>
 7 |     <objects>
 8 |         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
 9 |         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
10 |         <view contentMode="scaleToFill" id="iN0-l3-epB">
11 |             <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
12 |             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
13 |             <subviews>
14 |                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="  Copyright (c) 2015 Dative Studios. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
15 |                     <rect key="frame" x="20" y="439" width="441" height="21"/>
16 |                     <fontDescription key="fontDescription" type="system" pointSize="17"/>
17 |                     <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
18 |                     <nil key="highlightedColor"/>
19 |                 </label>
20 |                 <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="CollectionViewStickyHeaders" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
21 |                     <rect key="frame" x="20" y="140" width="441" height="43"/>
22 |                     <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
23 |                     <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
24 |                     <nil key="highlightedColor"/>
25 |                 </label>
26 |             </subviews>
27 |             <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
28 |             <constraints>
29 |                 <constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="5cJ-9S-tgC"/>
30 |                 <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
31 |                 <constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
32 |                 <constraint firstItem="8ie-xW-0ye" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="MfP-vx-nX0"/>
33 |                 <constraint firstAttribute="centerX" secondItem="8ie-xW-0ye" secondAttribute="centerX" id="ZEH-qu-HZ9"/>
34 |                 <constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
35 |             </constraints>
36 |             <nil key="simulatedStatusBarMetrics"/>
37 |             <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
38 |             <point key="canvasLocation" x="548" y="455"/>
39 |         </view>
40 |     </objects>
41 | </document>
42 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6254" systemVersion="14B25" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="k8S-eu-ph0">
  3 |     <dependencies>
  4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6247"/>
  5 |     </dependencies>
  6 |     <scenes>
  7 |         <!--Navigation Controller-->
  8 |         <scene sceneID="lsM-gw-jmz">
  9 |             <objects>
 10 |                 <navigationController id="k8S-eu-ph0" sceneMemberID="viewController">
 11 |                     <navigationBar key="navigationBar" contentMode="scaleToFill" id="PvP-If-sZ1">
 12 |                         <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
 13 |                         <autoresizingMask key="autoresizingMask"/>
 14 |                     </navigationBar>
 15 |                     <connections>
 16 |                         <segue destination="7aI-BD-ECc" kind="relationship" relationship="rootViewController" id="jwE-Ls-tJE"/>
 17 |                     </connections>
 18 |                 </navigationController>
 19 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="J7k-rT-Fxg" userLabel="First Responder" sceneMemberID="firstResponder"/>
 20 |             </objects>
 21 |             <point key="canvasLocation" x="434" y="730"/>
 22 |         </scene>
 23 |         <!--Sticky Headers-->
 24 |         <scene sceneID="Y7e-HK-0Qc">
 25 |             <objects>
 26 |                 <collectionViewController id="7aI-BD-ECc" customClass="CollectionViewController" customModule="CollectionViewStickyHeaders" customModuleProvider="target" sceneMemberID="viewController">
 27 |                     <collectionView key="view" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" id="cS0-4H-hCp">
 28 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
 29 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
 30 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
 31 |                         <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="oec-GL-zaQ" customClass="StickyHeaderFlowLayout" customModule="CollectionViewStickyHeaders" customModuleProvider="target">
 32 |                             <size key="itemSize" width="100" height="100"/>
 33 |                             <size key="headerReferenceSize" width="50" height="44"/>
 34 |                             <size key="footerReferenceSize" width="0.0" height="0.0"/>
 35 |                             <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="10"/>
 36 |                         </collectionViewFlowLayout>
 37 |                         <cells>
 38 |                             <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="TESTCELL" id="ajj-1V-Zf7">
 39 |                                 <rect key="frame" x="0.0" y="0.0" width="50" height="50"/>
 40 |                                 <autoresizingMask key="autoresizingMask"/>
 41 |                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
 42 |                                     <rect key="frame" x="0.0" y="0.0" width="100" height="100"/>
 43 |                                     <autoresizingMask key="autoresizingMask"/>
 44 |                                     <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
 45 |                                 </view>
 46 |                                 <color key="backgroundColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
 47 |                             </collectionViewCell>
 48 |                         </cells>
 49 |                         <collectionReusableView key="sectionHeaderView" opaque="NO" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="TESTHEADER" id="VMB-W0-Dzo" customClass="HeaderView" customModule="CollectionViewStickyHeaders" customModuleProvider="target">
 50 |                             <rect key="frame" x="0.0" y="64" width="600" height="44"/>
 51 |                             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
 52 |                             <subviews>
 53 |                                 <visualEffectView opaque="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="mth-th-CGp">
 54 |                                     <rect key="frame" x="0.0" y="-1" width="600" height="45"/>
 55 |                                     <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="5fV-HP-rym">
 56 |                                         <rect key="frame" x="0.0" y="0.0" width="600" height="45"/>
 57 |                                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
 58 |                                         <subviews>
 59 |                                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="6kY-Bm-jk3">
 60 |                                                 <rect key="frame" x="8" y="12" width="584" height="21"/>
 61 |                                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
 62 |                                                 <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
 63 |                                                 <nil key="highlightedColor"/>
 64 |                                             </label>
 65 |                                             <visualEffectView opaque="NO" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="blQ-wZ-iKc">
 66 |                                                 <rect key="frame" x="0.0" y="0.0" width="600" height="45"/>
 67 |                                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="3VH-eK-R0f">
 68 |                                                     <rect key="frame" x="0.0" y="0.0" width="600" height="45"/>
 69 |                                                     <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
 70 |                                                     <subviews>
 71 |                                                         <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="abh-yp-6Ww" userLabel="Top line">
 72 |                                                             <rect key="frame" x="0.0" y="0.0" width="600" height="1"/>
 73 |                                                             <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
 74 |                                                             <constraints>
 75 |                                                                 <constraint firstAttribute="height" constant="1" id="NnL-pc-mbd"/>
 76 |                                                             </constraints>
 77 |                                                         </view>
 78 |                                                         <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="sNx-Ds-TUD" userLabel="Bottom line">
 79 |                                                             <rect key="frame" x="0.0" y="44" width="600" height="1"/>
 80 |                                                             <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
 81 |                                                             <constraints>
 82 |                                                                 <constraint firstAttribute="height" constant="1" id="IeV-10-azY"/>
 83 |                                                             </constraints>
 84 |                                                         </view>
 85 |                                                     </subviews>
 86 |                                                     <constraints>
 87 |                                                         <constraint firstAttribute="bottom" secondItem="sNx-Ds-TUD" secondAttribute="bottom" id="DqS-hC-MnS"/>
 88 |                                                         <constraint firstItem="abh-yp-6Ww" firstAttribute="leading" secondItem="3VH-eK-R0f" secondAttribute="leading" id="O1t-Vd-jn3"/>
 89 |                                                         <constraint firstAttribute="trailing" secondItem="abh-yp-6Ww" secondAttribute="trailing" id="Omn-9N-caW"/>
 90 |                                                         <constraint firstItem="abh-yp-6Ww" firstAttribute="top" secondItem="3VH-eK-R0f" secondAttribute="top" id="dGL-ZW-b8a"/>
 91 |                                                         <constraint firstItem="sNx-Ds-TUD" firstAttribute="leading" secondItem="3VH-eK-R0f" secondAttribute="leading" id="o45-NV-N2P"/>
 92 |                                                         <constraint firstAttribute="trailing" secondItem="sNx-Ds-TUD" secondAttribute="trailing" id="qFF-cj-hR2"/>
 93 |                                                     </constraints>
 94 |                                                 </view>
 95 |                                                 <vibrancyEffect>
 96 |                                                     <blurEffect style="light"/>
 97 |                                                 </vibrancyEffect>
 98 |                                             </visualEffectView>
 99 |                                         </subviews>
100 |                                         <constraints>
101 |                                             <constraint firstAttribute="trailing" secondItem="blQ-wZ-iKc" secondAttribute="trailing" id="2SF-Mi-Ai4"/>
102 |                                             <constraint firstItem="blQ-wZ-iKc" firstAttribute="leading" secondItem="5fV-HP-rym" secondAttribute="leading" id="JKH-nA-N5Z"/>
103 |                                             <constraint firstAttribute="bottom" secondItem="blQ-wZ-iKc" secondAttribute="bottom" id="LVh-bm-Azd"/>
104 |                                             <constraint firstItem="blQ-wZ-iKc" firstAttribute="top" secondItem="5fV-HP-rym" secondAttribute="top" id="zHx-tI-xOI"/>
105 |                                         </constraints>
106 |                                     </view>
107 |                                     <blurEffect style="extraLight"/>
108 |                                 </visualEffectView>
109 |                             </subviews>
110 |                             <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
111 |                             <constraints>
112 |                                 <constraint firstAttribute="bottom" secondItem="mth-th-CGp" secondAttribute="bottom" id="BHw-AL-Waq"/>
113 |                                 <constraint firstItem="mth-th-CGp" firstAttribute="leading" secondItem="VMB-W0-Dzo" secondAttribute="leading" id="JYk-9c-ZEQ"/>
114 |                                 <constraint firstItem="mth-th-CGp" firstAttribute="top" secondItem="VMB-W0-Dzo" secondAttribute="top" constant="-1" id="PCe-6N-njR"/>
115 |                                 <constraint firstAttribute="trailing" secondItem="mth-th-CGp" secondAttribute="trailing" id="bxS-g9-6dF"/>
116 |                             </constraints>
117 |                             <connections>
118 |                                 <outlet property="label" destination="6kY-Bm-jk3" id="bCo-ks-IRB"/>
119 |                             </connections>
120 |                         </collectionReusableView>
121 |                         <connections>
122 |                             <outlet property="dataSource" destination="7aI-BD-ECc" id="WRt-99-tZe"/>
123 |                             <outlet property="delegate" destination="7aI-BD-ECc" id="lnw-KJ-eCJ"/>
124 |                         </connections>
125 |                     </collectionView>
126 |                     <navigationItem key="navigationItem" title="Sticky Headers" id="NC5-k9-7kC"/>
127 |                 </collectionViewController>
128 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="x4m-hd-85A" userLabel="First Responder" sceneMemberID="firstResponder"/>
129 |             </objects>
130 |             <point key="canvasLocation" x="1209" y="730"/>
131 |         </scene>
132 |     </scenes>
133 | </document>
134 | 


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/CollectionViewStickyHeaders/CollectionViewController.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Created by Pete Callaway on 10/01/2015.
 3 | //  Copyright (c) 2015 Dative Studios. All rights reserved.
 4 | //
 5 | 
 6 | import UIKit
 7 | 
 8 | class CollectionViewController: UICollectionViewController {
 9 | 
10 |     override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
11 |         return 10
12 |     }
13 |     
14 |     override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
15 |         return 8
16 |     }
17 |     
18 |     override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
19 |         return collectionView.dequeueReusableCellWithReuseIdentifier("TESTCELL", forIndexPath: indexPath) as UICollectionViewCell
20 |     }
21 |     
22 |     override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
23 |         if kind == UICollectionElementKindSectionHeader {
24 |             let headerView = collectionView.dequeueReusableSupplementaryViewOfKind(kind, withReuseIdentifier: "TESTHEADER", forIndexPath: indexPath) as HeaderView
25 |             headerView.label?.text = "Section \(indexPath.section)"
26 |             
27 |             return headerView
28 |         }
29 |         else {
30 |             assert(false, "Unsupported supplementary view kind")
31 |             return UICollectionReusableView()
32 |         }
33 |     }
34 |     
35 | }
36 | 
37 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/HeaderView.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Created by Pete Callaway on 10/01/2015.
 3 | //  Copyright (c) 2015 Dative Studios. All rights reserved.
 4 | //
 5 | 
 6 | import UIKit
 7 | 
 8 | class HeaderView: UICollectionReusableView {
 9 | 
10 |     @IBOutlet weak var label: UILabel?
11 |     
12 |     
13 |     class var reuseIdentifier: String {
14 |         return "HeaderView"
15 |     }
16 | }
17 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/Images.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "29x29",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "29x29",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "40x40",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "40x40",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "60x60",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "60x60",
31 |       "scale" : "3x"
32 |     }
33 |   ],
34 |   "info" : {
35 |     "version" : 1,
36 |     "author" : "xcode"
37 |   }
38 | }


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>com.dativestudios.$(PRODUCT_NAME:rfc1034identifier)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
37 | 		<string>UIInterfaceOrientationLandscapeRight</string>
38 | 	</array>
39 | </dict>
40 | </plist>
41 | 


--------------------------------------------------------------------------------
/CollectionViewStickyHeaders/StickyHeaderFlowLayout.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  Created by Pete Callaway on 10/01/2015.
  3 | //  Copyright (c) 2015 Dative Studios. All rights reserved.
  4 | //
  5 | 
  6 | import UIKit
  7 | 
  8 | 
  9 | class StickyHeaderFlowLayout: UICollectionViewFlowLayout {
 10 | 
 11 | 
 12 |     override func shouldInvalidateLayoutForBoundsChange(newBounds: CGRect) -> Bool {
 13 |         // Return true so we're asked for layout attributes as the content is scrolled
 14 |         return true
 15 |     }
 16 | 
 17 |     
 18 |     
 19 |     
 20 |     
 21 |     override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
 22 |         // Get the layout attributes for a standard UICollectionViewFlowLayout
 23 |         var elementsLayoutAttributes = super.layoutAttributesForElementsInRect(rect) as? [UICollectionViewLayoutAttributes]
 24 |         if elementsLayoutAttributes == nil {
 25 |             return nil
 26 |         }
 27 |         
 28 |         
 29 |         // Define a struct we can use to store optional layout attributes in a dictionary
 30 |         struct HeaderAttributes {
 31 |             var layoutAttributes: UICollectionViewLayoutAttributes?
 32 |         }
 33 |         var visibleSectionHeaderLayoutAttributes = [Int : HeaderAttributes]()
 34 |         
 35 |         
 36 |         // Loop through the layout attributes we have
 37 |         for (index, layoutAttributes) in enumerate(elementsLayoutAttributes!) {
 38 |             let section = layoutAttributes.indexPath.section
 39 |             
 40 |             switch layoutAttributes.representedElementCategory {
 41 |             case .SupplementaryView:
 42 |                 // If this is a set of layout attributes for a section header, replace them with modified attributes
 43 |                 if layoutAttributes.representedElementKind == UICollectionElementKindSectionHeader {
 44 |                     let newLayoutAttributes = layoutAttributesForSupplementaryViewOfKind(UICollectionElementKindSectionHeader, atIndexPath: layoutAttributes.indexPath)
 45 |                     elementsLayoutAttributes![index] = newLayoutAttributes
 46 |                     
 47 |                     // Store the layout attributes in the dictionary so we know they've been dealt with
 48 |                     visibleSectionHeaderLayoutAttributes[section] = HeaderAttributes(layoutAttributes: newLayoutAttributes)
 49 |                 }
 50 |                 
 51 |             case .Cell:
 52 |                 // Check if this is a cell for a section we've not dealt with yet
 53 |                 if visibleSectionHeaderLayoutAttributes[section] == nil {
 54 |                     // Stored a struct for this cell's section so we can can fill it out later if needed
 55 |                     visibleSectionHeaderLayoutAttributes[section] = HeaderAttributes(layoutAttributes: nil)
 56 |                 }
 57 |             
 58 |             case .DecorationView:
 59 |                 break
 60 |             }
 61 |         }
 62 |         
 63 |         // Loop through the sections we've found
 64 |         for (section, headerAttributes) in visibleSectionHeaderLayoutAttributes {
 65 |             // If the header for this section hasn't been set up, do it now
 66 |             if headerAttributes.layoutAttributes == nil {
 67 |                 let newAttributes = layoutAttributesForSupplementaryViewOfKind(UICollectionElementKindSectionHeader, atIndexPath: NSIndexPath(forItem: 0, inSection: section))
 68 |                 elementsLayoutAttributes!.append(newAttributes)
 69 |             }
 70 |         }
 71 |         
 72 |         return elementsLayoutAttributes
 73 |     }
 74 |     
 75 |     
 76 |     
 77 |     
 78 |     
 79 |     override func layoutAttributesForSupplementaryViewOfKind(elementKind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes! {
 80 |         // Get the layout attributes for a standard flow layout
 81 |         let attributes = super.layoutAttributesForSupplementaryViewOfKind(elementKind, atIndexPath: indexPath)
 82 |         
 83 |         // If this is a header, we should tweak it's attributes
 84 |         if elementKind == UICollectionElementKindSectionHeader {
 85 |             if let fullSectionFrame = frameForSection(indexPath.section) {
 86 |                 let minimumY = max(collectionView!.contentOffset.y + collectionView!.contentInset.top, fullSectionFrame.origin.y)
 87 |                 let maximumY = CGRectGetMaxY(fullSectionFrame) - headerReferenceSize.height - collectionView!.contentInset.bottom
 88 |                 
 89 |                 attributes.frame = CGRect(x: 0, y: min(minimumY, maximumY), width: collectionView!.bounds.size.width, height: headerReferenceSize.height)
 90 |                 attributes.zIndex = 1
 91 |             }
 92 |         }
 93 |         
 94 |         return attributes
 95 |     }
 96 | 
 97 |     
 98 |     
 99 |     
100 |     
101 |     // MARK: Private helper methods
102 |     
103 |     private func frameForSection(section: Int) -> CGRect? {
104 | 
105 |         // Sanity check
106 |         let numberOfItems = collectionView!.numberOfItemsInSection(section)
107 |         if numberOfItems == 0 {
108 |             return nil
109 |         }
110 |         
111 |         // Get the index paths for the first and last cell in the section
112 |         let firstIndexPath = NSIndexPath(forRow: 0, inSection: section)
113 |         let lastIndexPath = numberOfItems == 0 ? firstIndexPath : NSIndexPath(forRow: numberOfItems - 1, inSection: section)
114 |         
115 |         // Work out the top of the first cell and bottom of the last cell
116 |         var firstCellTop = layoutAttributesForItemAtIndexPath(firstIndexPath).frame.origin.y
117 |         let lastCellBottom = CGRectGetMaxY(layoutAttributesForItemAtIndexPath(lastIndexPath).frame)
118 |         
119 |         // Build the frame for the section
120 |         var frame = CGRectZero
121 | 
122 |         frame.size.width = collectionView!.bounds.size.width
123 |         frame.origin.y = firstCellTop
124 |         frame.size.height = lastCellBottom - firstCellTop
125 | 
126 |         // Increase the frame to allow space for the header
127 |         frame.origin.y -= headerReferenceSize.height
128 |         frame.size.height += headerReferenceSize.height
129 |         
130 |         // Increase the frame to allow space for an section insets
131 |         frame.origin.y -= sectionInset.top
132 |         frame.size.height += sectionInset.top
133 |         
134 |         frame.size.height += sectionInset.bottom
135 |         
136 |         return frame
137 |     }
138 | 
139 | }
140 | 


--------------------------------------------------------------------------------
/README.markdown:
--------------------------------------------------------------------------------
1 | This is the sample project to accompany the blog post '[Collection view sticky headers](http://dativestudios.com/blog/2015/01/10/collection_view_sticky_headers/)'.


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