├── BidirectionalCollection ├── Demo.gif ├── ViewController.h ├── AppDelegate.h ├── main.m ├── Images.xcassets │ └── AppIcon.appiconset │ │ └── Contents.json ├── Info.plist ├── AppDelegate.m ├── ViewController.m └── Base.lproj │ ├── LaunchScreen.xib │ └── Main.storyboard ├── BidirectionalCollection.xcodeproj ├── project.xcworkspace │ ├── contents.xcworkspacedata │ └── xcshareddata │ │ ├── BidirectionalCollection.xcscmblueprint │ │ └── BidirectionalCollection.xccheckout └── project.pbxproj ├── README.md ├── BidirectionalCollectionLayout ├── BidirectionCollectionLayout.h └── BidirectionCollectionLayout.m ├── BidirectionalCollectionTests ├── Info.plist └── BidirectionalCollectionTests.m ├── LICENSE └── .gitignore /BidirectionalCollection/Demo.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/akashraje/BidirectionalCollectionViewLayout/HEAD/BidirectionalCollection/Demo.gif -------------------------------------------------------------------------------- /BidirectionalCollection.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /BidirectionalCollection/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // BidirectionalCollection 4 | // 5 | // Created by Akash Raje on 18/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | 13 | 14 | @end 15 | 16 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # BidirectionalCollectionViewLayout 2 | An example with Custom CollectionViewLayout which will allow CollectionView to scroll in both Directions. Persisting the CollectionView's cell reusability. 3 | Also includes the option capability of floating headers. 4 | 5 | ![Demo](https://github.com/akashraje/BidirectionalCollectionViewLayout/blob/master/BidirectionalCollection/Demo.gif "Demo") 6 | -------------------------------------------------------------------------------- /BidirectionalCollection/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // BidirectionalCollection 4 | // 5 | // Created by Akash Raje on 18/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface AppDelegate : UIResponder 12 | 13 | @property (strong, nonatomic) UIWindow *window; 14 | 15 | 16 | @end 17 | 18 | -------------------------------------------------------------------------------- /BidirectionalCollection/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // BidirectionalCollection 4 | // 5 | // Created by Akash Raje on 18/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import 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 | -------------------------------------------------------------------------------- /BidirectionalCollectionLayout/BidirectionCollectionLayout.h: -------------------------------------------------------------------------------- 1 | // 2 | // BidirectionCollectionLayout.h 3 | // BidirectionalCollectionView 4 | // 5 | // Created by Akash Raje on 14/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @protocol BidirectionalCollectionLayoutDelegate 12 | @optional 13 | - (BOOL)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout shouldFloatSectionAtIndex:(NSInteger)section; 14 | 15 | @end 16 | 17 | @interface BidirectionCollectionLayout : UICollectionViewFlowLayout 18 | 19 | @end 20 | -------------------------------------------------------------------------------- /BidirectionalCollectionTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | com.akashraje.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | BNDL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | 24 | 25 | -------------------------------------------------------------------------------- /BidirectionalCollectionTests/BidirectionalCollectionTests.m: -------------------------------------------------------------------------------- 1 | // 2 | // BidirectionalCollectionTests.m 3 | // BidirectionalCollectionTests 4 | // 5 | // Created by Akash Raje on 18/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import 10 | #import 11 | 12 | @interface BidirectionalCollectionTests : XCTestCase 13 | 14 | @end 15 | 16 | @implementation BidirectionalCollectionTests 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 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015 akashraje 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | 23 | -------------------------------------------------------------------------------- /BidirectionalCollection/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 | "idiom" : "ipad", 35 | "size" : "29x29", 36 | "scale" : "1x" 37 | }, 38 | { 39 | "idiom" : "ipad", 40 | "size" : "29x29", 41 | "scale" : "2x" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "size" : "40x40", 46 | "scale" : "1x" 47 | }, 48 | { 49 | "idiom" : "ipad", 50 | "size" : "40x40", 51 | "scale" : "2x" 52 | }, 53 | { 54 | "idiom" : "ipad", 55 | "size" : "76x76", 56 | "scale" : "1x" 57 | }, 58 | { 59 | "idiom" : "ipad", 60 | "size" : "76x76", 61 | "scale" : "2x" 62 | } 63 | ], 64 | "info" : { 65 | "version" : 1, 66 | "author" : "xcode" 67 | } 68 | } -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 4 | 5 | ## Build generated 6 | build/ 7 | DerivedData/ 8 | 9 | ## Various settings 10 | *.pbxuser 11 | !default.pbxuser 12 | *.mode1v3 13 | !default.mode1v3 14 | *.mode2v3 15 | !default.mode2v3 16 | *.perspectivev3 17 | !default.perspectivev3 18 | xcuserdata/ 19 | 20 | ## Other 21 | *.moved-aside 22 | *.xcuserstate 23 | 24 | ## Obj-C/Swift specific 25 | *.hmap 26 | *.ipa 27 | *.dSYM.zip 28 | *.dSYM 29 | 30 | # CocoaPods 31 | # 32 | # We recommend against adding the Pods directory to your .gitignore. However 33 | # you should judge for yourself, the pros and cons are mentioned at: 34 | # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control 35 | # 36 | # Pods/ 37 | 38 | # Carthage 39 | # 40 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 41 | # Carthage/Checkouts 42 | 43 | Carthage/Build 44 | 45 | # fastlane 46 | # 47 | # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 48 | # screenshots whenever they are needed. 49 | # For more information about the recommended setup visit: 50 | # https://github.com/fastlane/fastlane/blob/master/fastlane/docs/Gitignore.md 51 | 52 | fastlane/report.xml 53 | fastlane/screenshots 54 | 55 | # Code Injection 56 | # 57 | # After new code Injection tools there's a generated folder /iOSInjectionProject 58 | # https://github.com/johnno1962/injectionforxcode 59 | 60 | iOSInjectionProject/ -------------------------------------------------------------------------------- /BidirectionalCollection/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | com.akashraje.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | UISupportedInterfaceOrientations~ipad 40 | 41 | UIInterfaceOrientationPortrait 42 | UIInterfaceOrientationPortraitUpsideDown 43 | UIInterfaceOrientationLandscapeLeft 44 | UIInterfaceOrientationLandscapeRight 45 | 46 | 47 | 48 | -------------------------------------------------------------------------------- /BidirectionalCollection.xcodeproj/project.xcworkspace/xcshareddata/BidirectionalCollection.xcscmblueprint: -------------------------------------------------------------------------------- 1 | { 2 | "DVTSourceControlWorkspaceBlueprintPrimaryRemoteRepositoryKey" : "92B8CBFD77C99B68CD66E5B93D1E6503BBA53123", 3 | "DVTSourceControlWorkspaceBlueprintWorkingCopyRepositoryLocationsKey" : { 4 | 5 | }, 6 | "DVTSourceControlWorkspaceBlueprintWorkingCopyStatesKey" : { 7 | "13E080F07A96198B9F431262607FD27AA7D84BF1" : 0, 8 | "92B8CBFD77C99B68CD66E5B93D1E6503BBA53123" : 0 9 | }, 10 | "DVTSourceControlWorkspaceBlueprintIdentifierKey" : "86056711-C572-4D34-A0C0-7056EAFB6F74", 11 | "DVTSourceControlWorkspaceBlueprintWorkingCopyPathsKey" : { 12 | "13E080F07A96198B9F431262607FD27AA7D84BF1" : "BidirectionCollectionView", 13 | "92B8CBFD77C99B68CD66E5B93D1E6503BBA53123" : "BidirectionalCollectionViewLayout" 14 | }, 15 | "DVTSourceControlWorkspaceBlueprintNameKey" : "BidirectionalCollection", 16 | "DVTSourceControlWorkspaceBlueprintVersion" : 204, 17 | "DVTSourceControlWorkspaceBlueprintRelativePathToProjectKey" : "BidirectionalCollection.xcodeproj", 18 | "DVTSourceControlWorkspaceBlueprintRemoteRepositoriesKey" : [ 19 | { 20 | "DVTSourceControlWorkspaceBlueprintRemoteRepositoryURLKey" : "https:\/\/github.com\/akashraje\/BidirectionCollectionView.git", 21 | "DVTSourceControlWorkspaceBlueprintRemoteRepositorySystemKey" : "com.apple.dt.Xcode.sourcecontrol.Git", 22 | "DVTSourceControlWorkspaceBlueprintRemoteRepositoryIdentifierKey" : "13E080F07A96198B9F431262607FD27AA7D84BF1" 23 | }, 24 | { 25 | "DVTSourceControlWorkspaceBlueprintRemoteRepositoryURLKey" : "https:\/\/github.com\/akashraje\/BidirectionalCollectionViewLayout.git", 26 | "DVTSourceControlWorkspaceBlueprintRemoteRepositorySystemKey" : "com.apple.dt.Xcode.sourcecontrol.Git", 27 | "DVTSourceControlWorkspaceBlueprintRemoteRepositoryIdentifierKey" : "92B8CBFD77C99B68CD66E5B93D1E6503BBA53123" 28 | } 29 | ] 30 | } -------------------------------------------------------------------------------- /BidirectionalCollection/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // BidirectionalCollection 4 | // 5 | // Created by Akash Raje on 18/07/15. 6 | // Copyright (c) 2015 Akash Raje. 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 | -------------------------------------------------------------------------------- /BidirectionalCollection.xcodeproj/project.xcworkspace/xcshareddata/BidirectionalCollection.xccheckout: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDESourceControlProjectFavoriteDictionaryKey 6 | 7 | IDESourceControlProjectIdentifier 8 | 86056711-C572-4D34-A0C0-7056EAFB6F74 9 | IDESourceControlProjectName 10 | BidirectionalCollection 11 | IDESourceControlProjectOriginsDictionary 12 | 13 | 13E080F07A96198B9F431262607FD27AA7D84BF1 14 | https://github.com/akashraje/BidirectionCollectionView.git 15 | 92B8CBFD77C99B68CD66E5B93D1E6503BBA53123 16 | https://github.com/akashraje/BidirectionalCollectionViewLayout.git 17 | 18 | IDESourceControlProjectPath 19 | BidirectionalCollection.xcodeproj 20 | IDESourceControlProjectRelativeInstallPathDictionary 21 | 22 | 13E080F07A96198B9F431262607FD27AA7D84BF1 23 | ../../../BidirectionCollectionView 24 | 92B8CBFD77C99B68CD66E5B93D1E6503BBA53123 25 | ../.. 26 | 27 | IDESourceControlProjectURL 28 | https://github.com/akashraje/BidirectionalCollectionViewLayout.git 29 | IDESourceControlProjectVersion 30 | 111 31 | IDESourceControlProjectWCCIdentifier 32 | 92B8CBFD77C99B68CD66E5B93D1E6503BBA53123 33 | IDESourceControlProjectWCConfigurations 34 | 35 | 36 | IDESourceControlRepositoryExtensionIdentifierKey 37 | public.vcs.git 38 | IDESourceControlWCCIdentifierKey 39 | 92B8CBFD77C99B68CD66E5B93D1E6503BBA53123 40 | IDESourceControlWCCName 41 | BidirectionalCollectionViewLayout 42 | 43 | 44 | IDESourceControlRepositoryExtensionIdentifierKey 45 | public.vcs.git 46 | IDESourceControlWCCIdentifierKey 47 | 13E080F07A96198B9F431262607FD27AA7D84BF1 48 | IDESourceControlWCCName 49 | BidirectionCollectionView 50 | 51 | 52 | 53 | 54 | -------------------------------------------------------------------------------- /BidirectionalCollection/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // BidirectionalCollection 4 | // 5 | // Created by Akash Raje on 18/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | 11 | @interface CollectionCell : UICollectionViewCell 12 | { 13 | 14 | __weak IBOutlet UILabel *_lblIndex; 15 | } 16 | @property (nonatomic, strong) NSString* index; 17 | @end 18 | 19 | @implementation CollectionCell 20 | 21 | - (void)setIndex:(NSString *)index { 22 | _index = index; 23 | _lblIndex.text = index; 24 | } 25 | @end 26 | 27 | 28 | @interface ViewController () 29 | { 30 | __weak IBOutlet UICollectionView *_collectionView; 31 | 32 | } 33 | @end 34 | 35 | @implementation ViewController 36 | 37 | - (void)viewDidLoad { 38 | [super viewDidLoad]; 39 | // Do any additional setup after loading the view, typically from a nib. 40 | } 41 | 42 | - (void)didReceiveMemoryWarning { 43 | [super didReceiveMemoryWarning]; 44 | // Dispose of any resources that can be recreated. 45 | } 46 | 47 | #pragma --mark CollectionView DataSource 48 | 49 | - (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section 50 | { 51 | return 10; 52 | } 53 | 54 | - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { 55 | return 10; 56 | } 57 | 58 | - (CGSize)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath 59 | { 60 | return (indexPath.section == 0) ? CGSizeMake(200, 80) : CGSizeMake(200, 200); 61 | } 62 | 63 | - (BOOL)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout shouldFloatSectionAtIndex:(NSInteger)section 64 | { 65 | return (section == 0); 66 | } 67 | 68 | - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section 69 | { 70 | return 10.f; 71 | } 72 | 73 | - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section 74 | { 75 | return 10.f; 76 | } 77 | 78 | - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section 79 | { 80 | return UIEdgeInsetsMake(10, 10, 10, 10); 81 | } 82 | 83 | - (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath { 84 | 85 | CollectionCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"CollectionCellId" forIndexPath:indexPath]; 86 | cell.index = [NSString stringWithFormat:@"%ld - %ld",(long)indexPath.section, (long)indexPath.row]; 87 | if (indexPath.section == 0) { 88 | cell.backgroundColor = [UIColor orangeColor]; 89 | } else { 90 | cell.backgroundColor = [UIColor whiteColor]; 91 | } 92 | return cell; 93 | } 94 | @end 95 | 96 | -------------------------------------------------------------------------------- /BidirectionalCollection/Base.lproj/LaunchScreen.xib: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 20 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | -------------------------------------------------------------------------------- /BidirectionalCollection/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | -------------------------------------------------------------------------------- /BidirectionalCollectionLayout/BidirectionCollectionLayout.m: -------------------------------------------------------------------------------- 1 | // 2 | // BidirectionCollectionLayout.m 3 | // BidirectionalCollectionView 4 | // 5 | // Created by Akash Raje on 14/07/15. 6 | // Copyright (c) 2015 Akash Raje. All rights reserved. 7 | // 8 | 9 | #import "BidirectionCollectionLayout.h" 10 | 11 | @interface BidirectionCollectionLayout () 12 | 13 | @end 14 | 15 | @implementation BidirectionCollectionLayout 16 | { 17 | NSDictionary *_layoutInfo; 18 | UIEdgeInsets maxInsets; 19 | CGFloat maxRowsWidth; 20 | CGFloat maxColumnHeight; 21 | __weak id delegate; 22 | } 23 | 24 | - (void)prepareLayout 25 | { 26 | delegate = (id) self.collectionView.delegate; 27 | //Calculate max values 28 | maxInsets = [self maxInsets]; 29 | maxRowsWidth = [self maxRowWidth]; 30 | maxColumnHeight = [self maxColumnHeight]; 31 | 32 | //Store calculated frames for cells in the dictionary 33 | NSMutableDictionary *cellLayoutInfo = [NSMutableDictionary dictionary]; 34 | 35 | //Calculate Frame for a cell, per values from DataSource 36 | CGFloat originY = 0; 37 | CGFloat floatingSectionOriginY = self.collectionView.contentOffset.y; 38 | BOOL sectionIsFloating = NO; 39 | 40 | for (NSInteger section = 0; section < [self.collectionView numberOfSections]; section++) { 41 | 42 | UIEdgeInsets itemInsets = UIEdgeInsetsZero; 43 | if ([delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) { 44 | itemInsets = [delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:section]; 45 | originY += itemInsets.top; 46 | } 47 | 48 | CGFloat height = 0; 49 | NSInteger itemCount = [self.collectionView numberOfItemsInSection:section]; 50 | CGFloat originX = itemInsets.left; 51 | 52 | if ([delegate respondsToSelector:@selector(collectionView:layout:shouldFloatSectionAtIndex:)]) { 53 | sectionIsFloating = [delegate collectionView:self.collectionView layout:self shouldFloatSectionAtIndex:section]; 54 | } 55 | for (NSInteger item = 0; item < itemCount; item++) { 56 | NSIndexPath *indexPath = [NSIndexPath indexPathForItem:item inSection:section]; 57 | 58 | UICollectionViewLayoutAttributes *itemAttributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath]; 59 | CGSize itemSize = CGSizeZero; 60 | if ([delegate respondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)]) { 61 | itemSize = [delegate collectionView:self.collectionView layout:self sizeForItemAtIndexPath:indexPath]; 62 | 63 | float selectedOriginY = originY; 64 | if (sectionIsFloating) { 65 | if (floatingSectionOriginY >= originY) { 66 | selectedOriginY = floatingSectionOriginY; 67 | } 68 | itemAttributes.zIndex = 1000;//any value greater than '0' 69 | } 70 | 71 | itemAttributes.frame = CGRectMake(originX, selectedOriginY, itemSize.width, itemSize.height); 72 | } 73 | cellLayoutInfo[indexPath] = itemAttributes; 74 | 75 | CGFloat interItemSpacingX = 0; 76 | if ([delegate respondsToSelector:@selector(collectionView:layout:minimumInteritemSpacingForSectionAtIndex:)]) { 77 | interItemSpacingX = [delegate collectionView:self.collectionView layout:self minimumInteritemSpacingForSectionAtIndex:section]; 78 | } 79 | 80 | originX += floorf(itemSize.width + interItemSpacingX); 81 | height = height > itemSize.height ? height : itemSize.height; 82 | } 83 | 84 | CGFloat interItemSpacingY = 0; 85 | if ([delegate respondsToSelector:@selector(collectionView:layout:minimumLineSpacingForSectionAtIndex:)]) { 86 | interItemSpacingY = [delegate collectionView:self.collectionView layout:self minimumLineSpacingForSectionAtIndex:section]; 87 | } 88 | 89 | originY += floor(height + interItemSpacingY); 90 | if (sectionIsFloating) { 91 | floatingSectionOriginY += height; 92 | } 93 | } 94 | 95 | _layoutInfo = cellLayoutInfo; 96 | } 97 | 98 | - (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect 99 | { 100 | NSMutableArray *allAttributes = [NSMutableArray arrayWithCapacity:_layoutInfo.count]; 101 | 102 | [_layoutInfo enumerateKeysAndObjectsUsingBlock:^(NSIndexPath *indexPath, 103 | UICollectionViewLayoutAttributes *attributes, 104 | BOOL *innerStop) { 105 | if (CGRectIntersectsRect(rect, attributes.frame)) { 106 | [allAttributes addObject:attributes]; 107 | } 108 | }]; 109 | 110 | return allAttributes; 111 | } 112 | 113 | - (BOOL) shouldInvalidateLayoutForBoundsChange:(CGRect)newBound 114 | { 115 | return YES; 116 | } 117 | 118 | - (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath 119 | { 120 | return _layoutInfo[indexPath]; 121 | } 122 | 123 | - (CGSize)collectionViewContentSize 124 | { 125 | CGFloat width = maxInsets.left 126 | + maxRowsWidth 127 | + maxInsets.right; 128 | 129 | CGFloat height = maxInsets.top 130 | + maxColumnHeight 131 | + maxInsets.bottom; 132 | 133 | return CGSizeMake(width, height); 134 | } 135 | 136 | //Maximum width of perticular section in CollectionView 137 | - (CGFloat)maxRowWidth 138 | { 139 | NSInteger sectionCount = [self.collectionView numberOfSections]; 140 | CGFloat maxRowWidth = 0; 141 | for (NSInteger section = 0; section < sectionCount; section++) { 142 | CGFloat maxWidth = 0; 143 | NSInteger itemCount = [self.collectionView numberOfItemsInSection:section]; 144 | 145 | //Find total width of this section. 146 | for (NSInteger item = 0; item < itemCount; item++) { 147 | NSIndexPath *indexPath = [NSIndexPath indexPathForItem:item inSection:section]; 148 | 149 | if ([delegate respondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)]) { 150 | CGSize itemSize = [delegate collectionView:self.collectionView layout:self sizeForItemAtIndexPath:indexPath]; 151 | maxWidth += itemSize.width ; 152 | } 153 | } 154 | 155 | CGFloat interItemSpace = 0; 156 | if ([delegate respondsToSelector:@selector(collectionView:layout:minimumInteritemSpacingForSectionAtIndex:)]) { 157 | CGFloat interItemSpacingX = [delegate collectionView:self.collectionView layout:self minimumInteritemSpacingForSectionAtIndex:section]; 158 | UIEdgeInsets itemInsets = UIEdgeInsetsZero; 159 | if ([delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) { 160 | itemInsets = [delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:section]; 161 | } 162 | 163 | interItemSpace = interItemSpacingX * (itemCount - 1); 164 | } 165 | maxWidth += interItemSpace; 166 | maxRowWidth = maxWidth > maxRowWidth ? maxWidth : maxRowWidth; 167 | } 168 | 169 | return maxRowWidth; 170 | } 171 | 172 | //Maximum Height of perticular Column in CollectionView 173 | - (CGFloat)maxColumnHeight 174 | { 175 | NSInteger sectionCount = [self.collectionView numberOfSections]; 176 | CGFloat maxHeight = 0; 177 | for (NSInteger section = 0; section < sectionCount; section++) { 178 | NSInteger itemCount = [self.collectionView numberOfItemsInSection:section]; 179 | CGFloat maxRowHeight = 0; 180 | for (NSInteger item = 0; item < itemCount; item++) { 181 | NSIndexPath *indexPath = [NSIndexPath indexPathForItem:item inSection:section]; 182 | if ([delegate respondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)]) { 183 | CGSize itemSize = [delegate collectionView:self.collectionView layout:self sizeForItemAtIndexPath:indexPath]; 184 | maxRowHeight = itemSize.height > maxRowHeight ? itemSize.height : maxRowHeight; 185 | } 186 | } 187 | CGFloat interSectionSpacingY = 0; 188 | if ([delegate respondsToSelector:@selector(collectionView:layout:minimumLineSpacingForSectionAtIndex:)]) { 189 | interSectionSpacingY = [delegate collectionView:self.collectionView layout:self minimumLineSpacingForSectionAtIndex:section]; 190 | } 191 | 192 | UIEdgeInsets itemInsets = UIEdgeInsetsZero; 193 | if ([delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) { 194 | itemInsets = [delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:section]; 195 | } 196 | 197 | maxHeight += maxRowHeight; 198 | 199 | //Add interSectionSpacing and Insets for all sections except last. 200 | if (section != sectionCount-1) { 201 | maxHeight += interSectionSpacingY + itemInsets.top; 202 | } 203 | } 204 | 205 | return maxHeight; 206 | } 207 | 208 | - (UIEdgeInsets)maxInsets 209 | { 210 | UIEdgeInsets maxEdgeInsets = UIEdgeInsetsZero; 211 | NSInteger sectionCount = [self.collectionView numberOfSections]; 212 | if ([delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) { 213 | UIEdgeInsets topRowInsets = [delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:0]; 214 | UIEdgeInsets bottomRowInsets = [delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:sectionCount]; 215 | maxEdgeInsets.top = topRowInsets.top; 216 | maxEdgeInsets.bottom = bottomRowInsets.bottom; 217 | } 218 | 219 | for (NSInteger section = 0; section < sectionCount; section++) { 220 | if ([delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) { 221 | UIEdgeInsets itemInsets = [delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:section]; 222 | maxEdgeInsets.left = itemInsets.left; 223 | maxEdgeInsets.right = itemInsets.right; 224 | } 225 | } 226 | 227 | return maxEdgeInsets; 228 | } 229 | 230 | @end 231 | -------------------------------------------------------------------------------- /BidirectionalCollection.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 46; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 5628FFAF1B5AB1EA00D89F45 /* main.m in Sources */ = {isa = PBXBuildFile; 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