├── .gitignore
├── README.md
├── TaskSwitcherDemo.xcodeproj
    ├── project.pbxproj
    └── project.xcworkspace
    │   └── contents.xcworkspacedata
├── TaskSwitcherDemo
    ├── AppDelegate.h
    ├── AppDelegate.m
    ├── Base.lproj
    │   ├── LaunchScreen.xib
    │   └── Main.storyboard
    ├── Images.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── InfiniteScrollView.h
    ├── InfiniteScrollView.m
    ├── Info.plist
    ├── TaskSwitcherViewController.h
    ├── TaskSwitcherViewController.m
    └── main.m
└── TaskSwitcherDemoTests
    ├── Info.plist
    └── TaskSwitcherDemoTests.m


/.gitignore:
--------------------------------------------------------------------------------
 1 | .DS_Store
 2 | *.swp
 3 | *~.nib
 4 | 
 5 | build/
 6 | xcuserdata/
 7 | *.pbxuser
 8 | *.perspective
 9 | *.perspectivev3
10 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # TaskSwitcherDemo
2 | iOS 9 task switcher animation demo
3 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo.xcodeproj/project.pbxproj:
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385 | 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
386 | 				PRODUCT_NAME = "$(TARGET_NAME)";
387 | 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/TaskSwitcherDemo.app/TaskSwitcherDemo";
388 | 			};
389 | 			name = Debug;
390 | 		};
391 | 		FAF48BBF1B75A8120086C0F5 /* Release */ = {
392 | 			isa = XCBuildConfiguration;
393 | 			buildSettings = {
394 | 				BUNDLE_LOADER = "$(TEST_HOST)";
395 | 				FRAMEWORK_SEARCH_PATHS = (
396 | 					"$(SDKROOT)/Developer/Library/Frameworks",
397 | 					"$(inherited)",
398 | 				);
399 | 				INFOPLIST_FILE = TaskSwitcherDemoTests/Info.plist;
400 | 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
401 | 				PRODUCT_NAME = "$(TARGET_NAME)";
402 | 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/TaskSwitcherDemo.app/TaskSwitcherDemo";
403 | 			};
404 | 			name = Release;
405 | 		};
406 | /* End XCBuildConfiguration section */
407 | 
408 | /* Begin XCConfigurationList section */
409 | 		FAF48B921B75A8120086C0F5 /* Build configuration list for PBXProject "TaskSwitcherDemo" */ = {
410 | 			isa = XCConfigurationList;
411 | 			buildConfigurations = (
412 | 				FAF48BB81B75A8120086C0F5 /* Debug */,
413 | 				FAF48BB91B75A8120086C0F5 /* Release */,
414 | 			);
415 | 			defaultConfigurationIsVisible = 0;
416 | 			defaultConfigurationName = Release;
417 | 		};
418 | 		FAF48BBA1B75A8120086C0F5 /* Build configuration list for PBXNativeTarget "TaskSwitcherDemo" */ = {
419 | 			isa = XCConfigurationList;
420 | 			buildConfigurations = (
421 | 				FAF48BBB1B75A8120086C0F5 /* Debug */,
422 | 				FAF48BBC1B75A8120086C0F5 /* Release */,
423 | 			);
424 | 			defaultConfigurationIsVisible = 0;
425 | 		};
426 | 		FAF48BBD1B75A8120086C0F5 /* Build configuration list for PBXNativeTarget "TaskSwitcherDemoTests" */ = {
427 | 			isa = XCConfigurationList;
428 | 			buildConfigurations = (
429 | 				FAF48BBE1B75A8120086C0F5 /* Debug */,
430 | 				FAF48BBF1B75A8120086C0F5 /* Release */,
431 | 			);
432 | 			defaultConfigurationIsVisible = 0;
433 | 		};
434 | /* End XCConfigurationList section */
435 | 	};
436 | 	rootObject = FAF48B8F1B75A8120086C0F5 /* Project object */;
437 | }
438 | 


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


--------------------------------------------------------------------------------
/TaskSwitcherDemo/AppDelegate.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.h
 3 | //  TaskSwitcherDemo
 4 | //
 5 | //  Created by ltebean on 15/8/8.
 6 | //  Copyright (c) 2015年 glow. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface AppDelegate : UIResponder <UIApplicationDelegate>
12 | 
13 | @property (strong, nonatomic) UIWindow *window;
14 | 
15 | 
16 | @end
17 | 
18 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/AppDelegate.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.m
 3 | //  TaskSwitcherDemo
 4 | //
 5 | //  Created by ltebean on 15/8/8.
 6 | //  Copyright (c) 2015年 glow. All rights reserved.
 7 | //
 8 | 
 9 | #import "AppDelegate.h"
10 | 
11 | @interface AppDelegate ()
12 | 
13 | @end
14 | 
15 | @implementation AppDelegate
16 | 
17 | 
18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
19 |     // Override point for customization after application launch.
20 |     return YES;
21 | }
22 | 
23 | - (void)applicationWillResignActive:(UIApplication *)application {
24 |     // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
25 |     // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
26 | }
27 | 
28 | - (void)applicationDidEnterBackground:(UIApplication *)application {
29 |     // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
30 |     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
31 | }
32 | 
33 | - (void)applicationWillEnterForeground:(UIApplication *)application {
34 |     // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
35 | }
36 | 
37 | - (void)applicationDidBecomeActive:(UIApplication *)application {
38 |     // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
39 | }
40 | 
41 | - (void)applicationWillTerminate:(UIApplication *)application {
42 |     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
43 | }
44 | 
45 | @end
46 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/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="7531" systemVersion="14A388b" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7520"/>
 5 |     </dependencies>
 6 |     <objects>
 7 |         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
 8 |         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
 9 |         <view contentMode="scaleToFill" id="iN0-l3-epB">
10 |             <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
11 |             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
12 |             <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
13 |             <nil key="simulatedStatusBarMetrics"/>
14 |             <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
15 |             <point key="canvasLocation" x="548" y="455"/>
16 |         </view>
17 |     </objects>
18 | </document>
19 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/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="7531" systemVersion="14A388b" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="vXZ-lx-hvc">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7520"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--Task Switcher View Controller-->
 8 |         <scene sceneID="ufC-wZ-h7g">
 9 |             <objects>
10 |                 <viewController id="vXZ-lx-hvc" customClass="TaskSwitcherViewController" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="jyV-Pf-zRb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="2fi-mo-0CV"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="kh9-bI-dsS">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
18 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
19 |                     </view>
20 |                 </viewController>
21 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="x5A-6p-PRh" sceneMemberID="firstResponder"/>
22 |             </objects>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/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 | }


--------------------------------------------------------------------------------
/TaskSwitcherDemo/InfiniteScrollView.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  LTInfiniteScrollView.h
 3 | //  LTInfiniteScrollView
 4 | //
 5 | //  Created by ltebean on 14/11/21.
 6 | //  Copyright (c) 2014年 ltebean. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | typedef enum ScrollDirection {
11 |     ScrollDirectionRight,
12 |     ScrollDirectionLeft,
13 | } ScrollDirection;
14 | 
15 | @protocol InfiniteScrollViewDelegate <NSObject>
16 | - (void)updateView:(UIView *)view withProgress:(CGFloat)progress scrollDirection:(ScrollDirection)direction;
17 | @end
18 | 
19 | @protocol InfiniteScrollViewDataSource <NSObject>
20 | - (UIView *)viewAtIndex:(NSInteger)index reusingView:(UIView *)view;
21 | - (NSInteger)numberOfViews;
22 | - (NSInteger)numberOfVisibleViews;
23 | @end
24 | 
25 | @interface InfiniteScrollView : UIView
26 | @property (nonatomic, readonly) NSInteger currentIndex;
27 | @property (nonatomic, weak) id<InfiniteScrollViewDataSource> dataSource;
28 | @property (nonatomic, weak) id<InfiniteScrollViewDelegate> delegate;
29 | @property (nonatomic) BOOL scrollEnabled;
30 | @property (nonatomic) BOOL pagingEnabled;
31 | @property (nonatomic) NSInteger maxScrollDistance;
32 | 
33 | - (void)reloadData;
34 | - (void)scrollToIndex:(NSInteger)index animated:(BOOL)animated;
35 | - (UIView *)viewAtIndex:(NSInteger)index;
36 | - (NSArray *)allViews;
37 | @end
38 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/InfiniteScrollView.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  LTInfiniteScrollView.m
  3 | //  LTInfiniteScrollView
  4 | //
  5 | //  Created by ltebean on 14/11/21.
  6 | //  Copyright (c) 2014年 ltebean. All rights reserved.
  7 | //
  8 | 
  9 | 
 10 | 
 11 | #import "InfiniteScrollView.h"
 12 | 
 13 | @interface InfiniteScrollView()<UIScrollViewDelegate>
 14 | @property (nonatomic) CGSize viewSize;
 15 | @property (nonatomic, strong) UIScrollView *scrollView;
 16 | @property (nonatomic, strong) NSMutableArray *views;
 17 | @property (nonatomic) NSInteger visibleViewCount;
 18 | @property (nonatomic) NSInteger totalViewCount;
 19 | @property (nonatomic) CGFloat preContentOffsetX;
 20 | @property (nonatomic) CGFloat totalWidth;
 21 | @property (nonatomic) BOOL dragging;
 22 | @property (nonatomic) ScrollDirection scrollDirection;
 23 | @end
 24 | 
 25 | @implementation InfiniteScrollView
 26 | 
 27 | - (instancetype)initWithFrame:(CGRect)frame
 28 | {
 29 |     self = [super initWithFrame:frame];
 30 |     if (self) {
 31 |         [self setup];
 32 |     }
 33 |     return self;
 34 | }
 35 | 
 36 | - (instancetype)initWithCoder:(NSCoder *)aDecoder
 37 | {
 38 |     self = [super initWithCoder:aDecoder];
 39 |     if (self) {
 40 |         [self setup];
 41 |     }
 42 |     return self;
 43 | }
 44 | 
 45 | - (void)setup
 46 | {
 47 |     self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.bounds), CGRectGetHeight(self.bounds))];
 48 |     self.scrollView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleHeight;
 49 |     self.scrollView.showsHorizontalScrollIndicator = NO;
 50 |     self.scrollView.delegate = self;
 51 |     self.scrollView.clipsToBounds = NO;
 52 |     self.scrollView.pagingEnabled = self.pagingEnabled;
 53 |     [self addSubview:self.scrollView];
 54 | }
 55 | 
 56 | #pragma mark - public methods
 57 | 
 58 | - (void)setPagingEnabled:(BOOL)pagingEnabled
 59 | {
 60 |     _pagingEnabled = pagingEnabled;
 61 |     self.scrollView.pagingEnabled = pagingEnabled;
 62 | }
 63 | 
 64 | - (void)setScrollEnabled:(BOOL)scrollEnabled
 65 | {
 66 |     _scrollEnabled = scrollEnabled;
 67 |     self.scrollView.scrollEnabled = scrollEnabled;
 68 | }
 69 | 
 70 | - (void)reloadData
 71 | {
 72 | 
 73 |     for (UIView *view in self.views) {
 74 |         [view removeFromSuperview];
 75 |     }
 76 |     
 77 |     self.visibleViewCount = [self.dataSource numberOfVisibleViews];
 78 |     self.totalViewCount = [self.dataSource numberOfViews];
 79 |     
 80 |     CGFloat viewWidth = CGRectGetWidth(self.bounds)/self.visibleViewCount;
 81 |     CGFloat viewHeight = CGRectGetHeight(self.bounds);
 82 |     self.viewSize = CGSizeMake(viewWidth, viewHeight);
 83 |     
 84 |     self.totalWidth = viewWidth * self.totalViewCount;
 85 |     
 86 |     self.scrollView.contentSize = CGSizeMake(self.totalWidth, CGRectGetHeight(self.bounds));
 87 |     
 88 |     self.views = [NSMutableArray array];
 89 |     
 90 |     int begin = -ceil(self.visibleViewCount / 2.0f);
 91 |     int end = ceil(self.visibleViewCount / 2.0f);
 92 |     _currentIndex = 0;
 93 |     
 94 |     self.scrollView.contentOffset = CGPointMake(self.totalWidth / 2-CGRectGetWidth(self.bounds) / 2, 0);
 95 |     
 96 |     CGFloat currentCenter = [self currentCenter].x;
 97 |     
 98 |     for (int i = begin; i<= end;i++) {
 99 |         UIView *view = [self.dataSource viewAtIndex:i reusingView:nil];
100 |         view.center = [self centerForViewAtIndex:i];
101 |         view.tag = i;
102 |         [self.views addObject:view];
103 |         [self.scrollView addSubview:view];
104 |         CGFloat progress = (view.center.x - currentCenter) / CGRectGetWidth(self.bounds) * self.visibleViewCount;
105 |         [self.delegate updateView:view withProgress:progress scrollDirection:self.scrollDirection];
106 |     }
107 | }
108 | 
109 | - (void)scrollToIndex:(NSInteger)index animated:(BOOL)animated
110 | {
111 |     self.dragging = YES;
112 |     [self.scrollView setContentOffset:[self contentOffsetForIndex:index] animated:animated];
113 | }
114 | 
115 | - (UIView *)viewAtIndex:(NSInteger)index
116 | {
117 |     CGPoint center = [self centerForViewAtIndex:index];
118 |     for (UIView *view in self.views) {
119 |         if (fabs(center.x - view.center.x) <= self.viewSize.width / 2.0f) {
120 |             return view;
121 |         }
122 |     }
123 |     return nil;
124 | }
125 | 
126 | - (NSArray *)allViews
127 | {
128 |     return self.views;
129 | }
130 | 
131 | # pragma mark - UIScrollView delegate
132 | - (void)scrollViewDidScroll:(UIScrollView *)scrollView
133 | {
134 |     CGFloat currentCenter = [self currentCenter].x;
135 |     CGFloat offset = currentCenter - self.totalWidth / 2;
136 |     _currentIndex = ceil((offset- self.viewSize.width / 2) / self.viewSize.width);
137 | 
138 |     for (UIView *view in self.views) {
139 |         if ([self viewCanBeQueuedForReuse:view]) {
140 |             NSInteger indexNeeded;
141 |             NSInteger indexOfViewToReuse = (NSInteger)view.tag;
142 |             if (indexOfViewToReuse < self.currentIndex) {
143 |                 indexNeeded = indexOfViewToReuse + self.visibleViewCount + 2;
144 |             } else {
145 |                 indexNeeded = indexOfViewToReuse - (self.visibleViewCount + 2);
146 |             }
147 |             
148 |             if (labs(indexNeeded) <= floorf(self.totalViewCount / 2)) {
149 |                 [view removeFromSuperview];
150 |                 UIView *viewNeeded = [self.dataSource viewAtIndex:indexNeeded reusingView:view];
151 |                 viewNeeded.center = [self centerForViewAtIndex:indexNeeded];
152 |                 [self.scrollView addSubview:viewNeeded];
153 |                 viewNeeded.tag = indexNeeded;
154 |             }
155 |         };
156 |         
157 |         CGFloat progress = (view.center.x - currentCenter) / CGRectGetWidth(self.bounds) * self.visibleViewCount;
158 |         [self.delegate updateView:view withProgress:progress scrollDirection:self.scrollDirection];
159 |         
160 |     }
161 |     if (self.scrollView.contentOffset.x > self.preContentOffsetX) {
162 |         self.scrollDirection = ScrollDirectionLeft;
163 |     } else {
164 |         self.scrollDirection = ScrollDirectionRight;
165 |     }
166 |     self.preContentOffsetX = self.scrollView.contentOffset.x;
167 | }
168 | 
169 | - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
170 | {
171 |     self.dragging = YES;
172 | }
173 | 
174 | - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
175 | {
176 |     self.dragging = NO;
177 |     if (!self.pagingEnabled && !decelerate) {
178 |         [self.scrollView setContentOffset:[self contentOffsetForIndex:self.currentIndex] animated:YES];
179 |     }
180 | }
181 | 
182 | - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
183 | {
184 |     if (!self.pagingEnabled) {
185 |         [self.scrollView setContentOffset:[self contentOffsetForIndex:self.currentIndex] animated:YES];
186 |     }
187 | }
188 | 
189 | - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
190 | {
191 |     if (self.maxScrollDistance <= 0) {
192 |         return;
193 |     }
194 |     CGFloat targetX = targetContentOffset -> x;
195 |     CGFloat currentX = [self contentOffsetForIndex:self.currentIndex].x;
196 |     if (fabs(targetX - currentX) <= self.viewSize.width / 2) {
197 |         return;
198 |     } else {
199 |         NSInteger distance = self.maxScrollDistance - 1;
200 |         NSInteger currentIndex = [self currentIndex];
201 |         NSInteger targetIndex = self.scrollDirection == ScrollDirectionLeft ? currentIndex + distance : currentIndex - distance;
202 |         targetContentOffset -> x = [self contentOffsetForIndex:targetIndex].x;
203 |     }
204 | }
205 | 
206 | #pragma mark - helper methods
207 | 
208 | - (CGPoint)currentCenter
209 | {
210 |     CGFloat x = self.scrollView.contentOffset.x + CGRectGetWidth(self.bounds) / 2.0f;
211 |     CGFloat y = self.scrollView.contentOffset.y;
212 |     return  CGPointMake(x, y);
213 | }
214 | 
215 | - (CGPoint)contentOffsetForIndex:(NSInteger)index
216 | {
217 |     CGFloat x = self.totalWidth / 2 + index*self.viewSize.width - CGRectGetWidth(self.bounds) / 2;
218 |     return CGPointMake(x, 0);
219 | }
220 | 
221 | - (CGPoint)centerForViewAtIndex:(NSInteger)index
222 | {
223 |     CGFloat y = CGRectGetMidY(self.bounds);
224 |     CGFloat x = self.totalWidth/2 + index * self.viewSize.width;
225 |     return CGPointMake(x, y);
226 | }
227 | 
228 | - (BOOL)viewCanBeQueuedForReuse:(UIView *)view
229 | {
230 |     CGFloat distanceToCenter = [self currentCenter].x - view.center.x;
231 |     CGFloat threshold = (ceil(self.visibleViewCount / 2.0f)) * self.viewSize.width + self.viewSize.width / 2.0f;
232 |     if (self.scrollDirection == ScrollDirectionLeft) {
233 |         if (distanceToCenter < 0){
234 |             return NO;
235 |         }
236 |     } else {
237 |         if (distanceToCenter > 0) {
238 |             return NO;
239 |         }
240 |     }
241 |     if (fabs(distanceToCenter) > threshold) {
242 |         return YES;
243 |     }
244 |     return NO;
245 | }
246 | @end
247 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/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>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>com.glow.$(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 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/TaskSwitcherViewController.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  TaskSwitcherViewController.h
 3 | //  LTInfiniteScrollView
 4 | //
 5 | //  Created by ltebean on 15/8/7.
 6 | //  Copyright (c) 2015年 ltebean. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface TaskSwitcherViewController : UIViewController
12 | 
13 | @end
14 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/TaskSwitcherViewController.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  TaskSwitcherViewController.m
  3 | //  LTInfiniteScrollView
  4 | //
  5 | //  Created by ltebean on 15/8/7.
  6 | //  Copyright (c) 2015年 ltebean. All rights reserved.
  7 | //
  8 | 
  9 | #import "TaskSwitcherViewController.h"
 10 | #import "InfiniteScrollView.h"
 11 | 
 12 | #define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
 13 | #define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
 14 | #define NUMBER_OF_VISIBLE_VIEWS 5
 15 | #define COLOR [UIColor colorWithRed:0/255.0 green:175/255.0 blue:240/255.0 alpha:1]
 16 | 
 17 | @interface TaskSwitcherViewController ()<InfiniteScrollViewDelegate,InfiniteScrollViewDataSource>
 18 | @property (strong, nonatomic) InfiniteScrollView *scrollView;
 19 | 
 20 | @end
 21 | 
 22 | @implementation TaskSwitcherViewController
 23 | 
 24 | - (void)viewDidLoad {
 25 |     [super viewDidLoad];
 26 |     self.view.backgroundColor = COLOR;
 27 |     // Do any additional setup after loading the view.
 28 |     self.scrollView = [[InfiniteScrollView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
 29 |     [self.view addSubview:self.scrollView];
 30 |     
 31 |     self.scrollView.dataSource = self;
 32 |     self.scrollView.delegate = self;
 33 |     self.scrollView.maxScrollDistance = 3;
 34 | }
 35 | 
 36 | - (void)viewDidLayoutSubviews
 37 | {
 38 |     [super viewDidLayoutSubviews];
 39 |     [self.scrollView reloadData];
 40 | }
 41 | 
 42 | # pragma mark - LTInfiniteScrollView dataSource
 43 | - (NSInteger)numberOfViews
 44 | {
 45 |     return 999;
 46 | }
 47 | 
 48 | - (NSInteger)numberOfVisibleViews
 49 | {
 50 |     return NUMBER_OF_VISIBLE_VIEWS;
 51 | }
 52 | 
 53 | # pragma mark - LTInfiniteScrollView delegate
 54 | - (UIView *)viewAtIndex:(NSInteger)index reusingView:(UIView *)view;
 55 | {
 56 |     if (!view) {
 57 |         view = [self newCard];
 58 |     }
 59 |     return view;
 60 | }
 61 | 
 62 | - (UIView *)newCard
 63 | {
 64 |     CGFloat width =  SCREEN_WIDTH / 10 * 7.2;
 65 |     UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, 500)];
 66 |     
 67 |     UIView *icon = [[UIView alloc] initWithFrame:CGRectMake(20, 10, 40, 40)];
 68 |     icon.backgroundColor = [UIColor whiteColor];
 69 |     icon.layer.cornerRadius = 5;
 70 |     
 71 |     UIView *snapshot = [[UIView alloc] initWithFrame:CGRectMake(0, 60, width, 430)];
 72 |     snapshot.backgroundColor = [UIColor whiteColor];
 73 |     snapshot.layer.cornerRadius = 5;
 74 |     UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:snapshot.bounds];
 75 |     snapshot.layer.shadowColor = [UIColor blackColor].CGColor;
 76 |     snapshot.layer.shadowOffset = CGSizeMake(2.0f, 2.0f);
 77 |     snapshot.layer.shadowOpacity = .3;
 78 |     snapshot.layer.shadowPath = shadowPath.CGPath;
 79 |     
 80 |     [view addSubview:icon];
 81 |     [view addSubview:snapshot];
 82 |     return view;
 83 | }
 84 | 
 85 | - (void)updateView:(UIView *)view withProgress:(CGFloat)progress scrollDirection:(ScrollDirection)direction
 86 | {
 87 |     
 88 |     // adjust z-index of each views
 89 |     NSMutableArray *views = [[self.scrollView allViews] mutableCopy];
 90 |     [views sortUsingComparator:^NSComparisonResult(UIView *view1, UIView *view2) {
 91 |         return view1.tag > view2.tag;
 92 |     }];
 93 |     for (UIView *view in views) {
 94 |         [view.superview bringSubviewToFront:view];
 95 |     }
 96 |     
 97 |     // alpha
 98 |     if (progress >= 0) {
 99 |         view.alpha = 1;
100 |     } else {
101 |         view.alpha = 1 - fabs(progress) * 0.2;
102 |     }
103 | 
104 |     
105 |     CGAffineTransform transform = CGAffineTransformIdentity;
106 |     
107 |     // scale
108 |     CGFloat scale = 1 + (progress) * 0.03;
109 |     transform = CGAffineTransformScale(transform, scale, scale);
110 | 
111 |     // translation
112 |     CGFloat translation = 0;
113 |     if (progress > 0) {
114 |          translation = fabs(progress) * SCREEN_WIDTH / 2.2;
115 |     } else {
116 |          translation = fabs(progress) * SCREEN_WIDTH / 15;
117 |     }
118 |     
119 |     transform = CGAffineTransformTranslate(transform, translation, 0);
120 |     view.transform = transform;
121 | }
122 | 
123 | @end
124 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemo/main.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  main.m
 3 | //  TaskSwitcherDemo
 4 | //
 5 | //  Created by ltebean on 15/8/8.
 6 | //  Copyright (c) 2015年 glow. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | #import "AppDelegate.h"
11 | 
12 | int main(int argc, char * argv[]) {
13 |     @autoreleasepool {
14 |         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
15 |     }
16 | }
17 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemoTests/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>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>com.glow.$(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>BNDL</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 | </dict>
24 | </plist>
25 | 


--------------------------------------------------------------------------------
/TaskSwitcherDemoTests/TaskSwitcherDemoTests.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  TaskSwitcherDemoTests.m
 3 | //  TaskSwitcherDemoTests
 4 | //
 5 | //  Created by ltebean on 15/8/8.
 6 | //  Copyright (c) 2015年 glow. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | #import <XCTest/XCTest.h>
11 | 
12 | @interface TaskSwitcherDemoTests : XCTestCase
13 | 
14 | @end
15 | 
16 | @implementation TaskSwitcherDemoTests
17 | 
18 | - (void)setUp {
19 |     [super setUp];
20 |     // Put setup code here. This method is called before the invocation of each test method in the class.
21 | }
22 | 
23 | - (void)tearDown {
24 |     // Put teardown code here. This method is called after the invocation of each test method in the class.
25 |     [super tearDown];
26 | }
27 | 
28 | - (void)testExample {
29 |     // This is an example of a functional test case.
30 |     XCTAssert(YES, @"Pass");
31 | }
32 | 
33 | - (void)testPerformanceExample {
34 |     // This is an example of a performance test case.
35 |     [self measureBlock:^{
36 |         // Put the code you want to measure the time of here.
37 |     }];
38 | }
39 | 
40 | @end
41 | 


--------------------------------------------------------------------------------