├── MONUniformFlowLayout-Screenshot.png ├── MONUniformFlowLayoutSample.xcodeproj ├── project.xcworkspace │ └── contents.xcworkspacedata └── project.pbxproj ├── MONUniformFlowLayoutSample ├── CollectionViewCell.m ├── CollectionFooterView.m ├── CollectionHeaderView.m ├── CollectionViewCell.h ├── InputViewController.h ├── CollectionFooterView.h ├── CollectionHeaderView.h ├── ViewController.h ├── AppDelegate.h ├── main.m ├── Images.xcassets │ └── AppIcon.appiconset │ │ └── Contents.json ├── Info.plist ├── default.json ├── AppDelegate.m ├── InputViewController.m ├── Base.lproj │ └── LaunchScreen.xib └── ViewController.m ├── .gitignore ├── MONUniformFlowLayout.podspec ├── MONUniformFlowLayoutSampleTests ├── Info.plist └── Dummy.m ├── LICENSE ├── README.md └── MONUniformFlowLayout ├── MONUniformFlowLayout.h └── MONUniformFlowLayout.m /MONUniformFlowLayout-Screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mownier/MONUniformFlowLayout/HEAD/MONUniformFlowLayout-Screenshot.png -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/CollectionViewCell.m: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionViewCell.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import "CollectionViewCell.h" 10 | 11 | @implementation CollectionViewCell 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/CollectionFooterView.m: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionFooterView.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/5/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import "CollectionFooterView.h" 10 | 11 | @implementation CollectionFooterView 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/CollectionHeaderView.m: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionHeaderView.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/3/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import "CollectionHeaderView.h" 10 | 11 | @implementation CollectionHeaderView 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/CollectionViewCell.h: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionViewCell.h 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface CollectionViewCell : UICollectionViewCell 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/InputViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // InputViewController.h 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/10/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface InputViewController : UIViewController 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/CollectionFooterView.h: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionFooterView.h 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/5/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface CollectionFooterView : UICollectionReusableView 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/CollectionHeaderView.h: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionHeaderView.h 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/3/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface CollectionHeaderView : UICollectionReusableView 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # OS X 2 | .DS_Store 3 | 4 | # Xcode 5 | build/ 6 | *.pbxuser 7 | !default.pbxuser 8 | *.mode1v3 9 | !default.mode1v3 10 | *.mode2v3 11 | !default.mode2v3 12 | *.perspectivev3 13 | !default.perspectivev3 14 | xcuserdata 15 | *.xccheckout 16 | profile 17 | *.moved-aside 18 | DerivedData 19 | *.hmap 20 | *.ipa 21 | 22 | # CocoaPods 23 | Pods 24 | 25 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | 13 | @property (copy, nonatomic) NSDictionary *inputInfo; 14 | 15 | @end 16 | 17 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. 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 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. 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 | -------------------------------------------------------------------------------- /MONUniformFlowLayout.podspec: -------------------------------------------------------------------------------- 1 | Pod::Spec.new do |s| 2 | s.name = 'MONUniformFlowLayout' 3 | s.version = '0.0.1' 4 | s.summary = 'A simple flow layout the handles the arrangement of the items in a collection view uniformly for a particular section.' 5 | s.platform = :ios, '7.0' 6 | s.license = { :type => 'MIT', :file => 'LICENSE' } 7 | s.homepage = 'https://github.com/mownier/MONUniformFlowLayout' 8 | s.author = { 'Mounir Ybanez' => 'rinuom91@gmail.com' } 9 | s.source = { :git =>'https://github.com/mownier/MONUniformFlowLayout.git', :tag => s.version.to_s } 10 | s.source_files = 'MONUniformFlowLayout/*.{h,m}' 11 | s.requires_arc = true 12 | end 13 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/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 | } -------------------------------------------------------------------------------- /MONUniformFlowLayoutSampleTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | com.mownier.$(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 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSampleTests/Dummy.m: -------------------------------------------------------------------------------- 1 | // 2 | // Dummy.m 3 | // MONUniformFlowLayoutSample 4 | // 5 | // Created by mownier on 12/10/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import 10 | #import 11 | 12 | @interface Dummy : XCTestCase 13 | 14 | @end 15 | 16 | @implementation Dummy 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) 2014 mownier 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 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | com.mownier.$(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 | NSMainNibFile 26 | LaunchScreen 27 | UILaunchStoryboardName 28 | LaunchScreen 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | 40 | 41 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/default.json: -------------------------------------------------------------------------------- 1 | { 2 | "sections": [ 3 | { 4 | "item_height": 100, 5 | "header_height": 40, 6 | "footer_height": 40, 7 | "portrait_number_of_columns": 3, 8 | "landscape_number_of_columns": 2, 9 | "number_of_items": 20, 10 | "item_color": "0x15ab12", 11 | "header_color": "0x984acc", 12 | "footer_color": "0xbcd112" 13 | }, 14 | { 15 | "item_height": 75, 16 | "header_height": 40, 17 | "footer_height": 40, 18 | "portrait_number_of_columns": 4, 19 | "landscape_number_of_columns": 2, 20 | "number_of_items": 10, 21 | "item_color": "0xab123d", 22 | "header_color": "0x5fe1e1", 23 | "footer_color": "0xb58a24" 24 | }, 25 | { 26 | "item_height": 75, 27 | "header_height": 40, 28 | "footer_height": 40, 29 | "portrait_number_of_columns": 3, 30 | "landscape_number_of_columns": 2, 31 | "number_of_items": 80, 32 | "item_color": "0x2d34c1", 33 | "header_color": "0xf122c2", 34 | "footer_color": "0x23443c" 35 | } 36 | ], 37 | "content_inset": { 38 | "top": 0, 39 | "left": 10, 40 | "bottom": 0, 41 | "right": 10 42 | }, 43 | "item_spacing": { 44 | "horizontal": 10, 45 | "vertical": 20 46 | }, 47 | "section_spacing": 0, 48 | "sticky_header": true 49 | } -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import "AppDelegate.h" 10 | #import "InputViewController.h" 11 | 12 | @interface AppDelegate () 13 | 14 | @end 15 | 16 | @implementation AppDelegate 17 | 18 | 19 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 20 | // Override point for customization after application launch. 21 | self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; 22 | InputViewController *vc = [InputViewController new]; 23 | UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc]; 24 | self.window.rootViewController = nav; 25 | [self.window makeKeyAndVisible]; 26 | return YES; 27 | } 28 | 29 | - (void)applicationWillResignActive:(UIApplication *)application { 30 | // 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. 31 | // 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. 32 | } 33 | 34 | - (void)applicationDidEnterBackground:(UIApplication *)application { 35 | // 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. 36 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 37 | } 38 | 39 | - (void)applicationWillEnterForeground:(UIApplication *)application { 40 | // 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. 41 | } 42 | 43 | - (void)applicationDidBecomeActive:(UIApplication *)application { 44 | // 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. 45 | } 46 | 47 | - (void)applicationWillTerminate:(UIApplication *)application { 48 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 49 | } 50 | 51 | @end 52 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # MONUniformFlowLayout 2 | A simple flow layout the handles the arrangement of the items in a collection view uniformly based on the given number of columns, height of the item, inter item spacing, header height, and footer height for a particular section. 3 | 4 | 5 | ![MONUniformFlowLayout](https://raw.github.com/mownier/MONUniformFlowLayout/master/MONUniformFlowLayout-Screenshot.png) 6 | 7 | ## Installation 8 | * Manual Install 9 | 10 | ``` 11 | 1. Add the files 'MONUniformFlowLayout.h' and 'MONUniformFlowLayout.m' to your project. 12 | 2. Then import the header file to use it. 13 | ``` 14 | 15 | * Via CocoaPods 16 | 17 | ``` 18 | 1. Add 'pod MONUniformFlowLayout' in your Podfile. 19 | 2. Then 'pod install' in the terminal. 20 | ``` 21 | 22 | ## Setting as UICollectionView's Layout 23 | ```objective-c 24 | MONUniformFlowLayout *layout = [MONUniformFlowLayout new]; 25 | layout.interItemSpacing = MONInterItemSpacingMake(10.0f, 10.0f); 26 | layout.enableStickyHeader = YES; 27 | 28 | UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds 29 | collectionViewLayout:layout]; 30 | ``` 31 | The property `interItemSpacing` is the horizontal and the vertical space between items for all sections while the property `enableStickyHeader` gives an option to the user whether the collection view should enable or disable sticky header views for all sections. 32 | 33 | The static inline method `MONInterItemSpacingMake(CGFloat x, CGFloat y)` creates a struct defining the horizontal and vertical spaces between items. 34 | 35 | ## MONUniformFlowLayoutDelegate Methods 36 | ```objective-c 37 | @required 38 | // Gets the item height in a particular section 39 | - (CGFloat)collectionView:(UICollectionView *)collectionView 40 | layout:(MONUniformFlowLayout *)layout 41 | itemHeightInSection:(NSInteger)section; 42 | 43 | @optional 44 | // Gets the header height in a particular section 45 | - (CGFloat)collectionView:(UICollectionView *)collectionView 46 | layout:(MONUniformFlowLayout *)layout 47 | headerHeightInSection:(NSInteger)section; 48 | 49 | // Gets the footer height in a particular section 50 | - (CGFloat)collectionView:(UICollectionView *)collectionView 51 | layout:(MONUniformFlowLayout *)layout 52 | footerHeightInSection:(NSInteger)section; 53 | 54 | // Gets the spacing between sections 55 | - (CGFloat)collectionView:(UICollectionView *)collectionView 56 | sectionSpacingForlayout:(MONUniformFlowLayout *)layout; 57 | 58 | // Gets the number of columns in a particular section 59 | - (NSUInteger)collectionView:(UICollectionView *)collectionView 60 | layout:(MONUniformFlowLayout *)layout 61 | numberOfColumnsInSection:(NSInteger)section;) 62 | ``` 63 | 64 | Usage in a UIViewController 65 | 66 | ```objective-c 67 | @interface ViewController : UIViewController 70 | ... 71 | @end 72 | ``` -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/InputViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // InputViewController.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/10/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import "InputViewController.h" 10 | #import "ViewController.h" 11 | 12 | @interface InputViewController () 13 | 14 | @property (strong, nonatomic) UITextView *textView; 15 | 16 | - (void)tapRightBarButtonItem; 17 | - (void)tapLeftBarButtonItem; 18 | 19 | - (NSString *)getDefaultJSONString; 20 | 21 | @end 22 | 23 | @implementation InputViewController 24 | 25 | #pragma mark - 26 | #pragma mark - View Cycle 27 | 28 | - (void)viewDidLoad { 29 | [super viewDidLoad]; 30 | self.view.backgroundColor = [UIColor lightGrayColor]; 31 | [self.textView becomeFirstResponder]; 32 | [self.view addSubview:self.textView]; 33 | NSDictionary *views = @{ @"textView": self.textView }; 34 | [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[textView]|" options:0 metrics:0 views:views]]; 35 | [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[textView]|" options:0 metrics:0 views:views]]; 36 | 37 | UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Go" style:UIBarButtonItemStylePlain target:self action:@selector(tapRightBarButtonItem)]; 38 | UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Default" style:UIBarButtonItemStylePlain target:self action:@selector(tapLeftBarButtonItem)]; 39 | self.navigationItem.rightBarButtonItem = rightBarButtonItem; 40 | self.navigationItem.leftBarButtonItem = leftBarButtonItem; 41 | } 42 | 43 | #pragma mark - 44 | #pragma mark - Actions 45 | 46 | - (void)tapRightBarButtonItem { 47 | NSError *error; 48 | NSDictionary *inputInfo = [NSJSONSerialization JSONObjectWithData:[self.textView.text dataUsingEncoding:NSUTF8StringEncoding] options:0 error:&error]; 49 | if (error) { 50 | UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Malformed JSON format" message:error.localizedDescription delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 51 | [alertView show]; 52 | return; 53 | } 54 | ViewController *vc = [ViewController new]; 55 | vc.inputInfo = inputInfo; 56 | [self.navigationController pushViewController:vc animated:YES]; 57 | } 58 | 59 | - (void)tapLeftBarButtonItem { 60 | self.textView.text = [self getDefaultJSONString]; 61 | } 62 | 63 | #pragma mark - 64 | #pragma mark - Text View 65 | 66 | - (UITextView *)textView { 67 | if (!_textView) { 68 | _textView = [[UITextView alloc] initWithFrame:CGRectZero]; 69 | _textView.backgroundColor = [UIColor clearColor]; 70 | _textView.translatesAutoresizingMaskIntoConstraints = NO; 71 | _textView.contentInset = UIEdgeInsetsMake(0, 0, 260.0f, 0); 72 | _textView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 0, 260.0f, 0); 73 | _textView.text = [self getDefaultJSONString]; 74 | } 75 | return _textView; 76 | } 77 | 78 | #pragma mark - 79 | #pragma mark - Default JSON String 80 | 81 | - (NSString *)getDefaultJSONString { 82 | NSBundle *bundle = [NSBundle mainBundle]; 83 | return [NSString stringWithContentsOfFile:[bundle pathForResource:@"default" ofType:@"json"] encoding:NSUTF8StringEncoding error:nil]; 84 | } 85 | 86 | @end 87 | -------------------------------------------------------------------------------- /MONUniformFlowLayout/MONUniformFlowLayout.h: -------------------------------------------------------------------------------- 1 | // 2 | // MONUniformFlowLayout.h 3 | // 4 | // Created by mownier on 12/2/14. 5 | // Copyright (c) 2014 mownier. All rights reserved. 6 | // 7 | 8 | #import 9 | 10 | /** 11 | * Spacing for the items 12 | */ 13 | typedef struct MONInterItemSpacing { 14 | CGFloat x, y; 15 | } MONInterItemSpacing; 16 | 17 | /** 18 | * Creates an InterItemSpacing struct 19 | */ 20 | static inline MONInterItemSpacing MONInterItemSpacingMake(CGFloat x, CGFloat y) { 21 | MONInterItemSpacing spacing = {x, y}; 22 | return spacing; 23 | } 24 | 25 | @interface MONUniformFlowLayout : UICollectionViewFlowLayout 26 | 27 | /// The inter spacing for all items 28 | @property (readwrite, nonatomic) MONInterItemSpacing interItemSpacing; 29 | 30 | /// Condition to enable/disable sticky headers 31 | @property (readwrite, nonatomic) BOOL enableStickyHeader; 32 | 33 | /** 34 | * Computes the width of all the items for a particular section 35 | * @param section A particular section in the collection view 36 | * @return The width of all the items for a particular section 37 | */ 38 | - (CGFloat)computeItemWidthInSection:(NSInteger)section; 39 | 40 | @end 41 | 42 | /** 43 | * Handles the definition of the item height, header height, 44 | * footer height, section spacing, and number of columns 45 | * for a particular section 46 | */ 47 | @protocol MONUniformFlowLayoutDelegate 48 | 49 | /** 50 | * Gets the item height in a particular section 51 | * @param collectionView The involved UICollectionView 52 | * layout The involed UICollectionViewFlowLayout 53 | * section The section that needs the value of the height of it's items 54 | * @return Height for all the section's items 55 | */ 56 | - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(MONUniformFlowLayout *)layout itemHeightInSection:(NSInteger)section; 57 | 58 | @optional 59 | 60 | /** 61 | * Gets the header height in a particular section 62 | * @param collectionView The involved UICollectionView 63 | * layout The involed UICollectionViewFlowLayout 64 | * section The section that needs the value of the it's header height 65 | * @return Height of the section's header 66 | */ 67 | - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(MONUniformFlowLayout *)layout headerHeightInSection:(NSInteger)section; 68 | 69 | /** 70 | * Gets the footer height in a particular section 71 | * @param collectionView The involved UICollectionView 72 | * layout The involed UICollectionViewFlowLayout 73 | * section The section that needs the value of the it's footer height 74 | * @return Height of the section's footer 75 | */ 76 | - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(MONUniformFlowLayout *)layout footerHeightInSection:(NSInteger)section; 77 | 78 | /** 79 | * Gets the spacing between sections 80 | * @param collectionView The involved UICollectionView 81 | * layout The involed UICollectionViewFlowLayout 82 | * @return Section spacing between sections 83 | */ 84 | - (CGFloat)collectionView:(UICollectionView *)collectionView sectionSpacingForlayout:(MONUniformFlowLayout *)layout; 85 | 86 | /** 87 | * Gets the number of columns in a particular section 88 | * @param collectionView The involved UICollectionView 89 | * layout The involed UICollectionViewFlowLayout 90 | * section The section that needs the value of the it's footer height 91 | * @return Number of columns 92 | */ 93 | - (NSUInteger)collectionView:(UICollectionView *)collectionView layout:(MONUniformFlowLayout *)layout numberOfColumnsInSection:(NSInteger)section; 94 | 95 | @end 96 | 97 | 98 | 99 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/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 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // CollectionSample 4 | // 5 | // Created by mownier on 12/2/14. 6 | // Copyright (c) 2014 mownier. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | #import "CollectionViewCell.h" 11 | #import "MONUniformFlowLayout.h" 12 | #import "CollectionHeaderView.h" 13 | #import "CollectionFooterView.h" 14 | 15 | static NSString *kCollectionViewCellIdentifier = @"kCollectionViewCellIdentifier"; 16 | static NSString *kCollectionViewSectionHeaderIdentifier = @"kCollectionViewSectionHeaderIdentifier"; 17 | static NSString *kCollectionViewSectionFooterIdentifier = @"kCollectionViewSectionFooterIdentifier"; 18 | 19 | @interface ViewController () 20 | 21 | @property (strong, nonatomic) UICollectionView *collectionView; 22 | @property (strong, nonatomic) MONUniformFlowLayout *simpleLayout; 23 | 24 | - (void)addVerticalConstraints:(NSArray **)verticalConstraints 25 | horizontalConstraints:(NSArray **)horizontalConstraints 26 | views:(NSDictionary *)views 27 | metrics:(NSDictionary *)metrics; 28 | 29 | - (UIColor *)colorWithHexString:(NSString *)stringToConvert; 30 | 31 | @end 32 | 33 | @implementation ViewController 34 | 35 | #pragma mark - 36 | #pragma mark - View Lifecycle 37 | 38 | - (void)viewDidLoad { 39 | [super viewDidLoad]; 40 | self.view.backgroundColor = [UIColor lightGrayColor]; 41 | 42 | [self.collectionView registerClass:[CollectionViewCell class] forCellWithReuseIdentifier:kCollectionViewCellIdentifier]; 43 | [self.collectionView registerClass:[CollectionHeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:kCollectionViewSectionHeaderIdentifier]; 44 | [self.collectionView registerClass:[CollectionFooterView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:kCollectionViewSectionFooterIdentifier]; 45 | [self.view addSubview:self.collectionView]; 46 | 47 | NSArray *v; 48 | NSArray *h; 49 | NSDictionary *views = @{ @"collectionView": self.collectionView }; 50 | [self addVerticalConstraints:&v horizontalConstraints:&h views:views metrics:nil]; 51 | [self.view addConstraints:v]; 52 | [self.view addConstraints:h]; 53 | } 54 | 55 | #pragma mark - 56 | #pragma mark - Add Vertical and Horizontal Constraints 57 | 58 | - (void)addVerticalConstraints:(NSArray *__autoreleasing *)verticalConstraints 59 | horizontalConstraints:(NSArray *__autoreleasing *)horizontalConstraints 60 | views:(NSDictionary *)views 61 | metrics:(NSDictionary *)metrics { 62 | NSMutableArray *v = [NSMutableArray new]; 63 | NSMutableArray *h = [NSMutableArray new]; 64 | 65 | [v addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[collectionView]-0-|" options:0 metrics:metrics views:views]]; 66 | 67 | [h addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[collectionView]-0-|" options:0 metrics:metrics views:views]]; 68 | 69 | *verticalConstraints = v; 70 | *horizontalConstraints = h; 71 | } 72 | 73 | #pragma mark - 74 | #pragma mark - Collection View 75 | 76 | - (UICollectionView *)collectionView { 77 | if (!_collectionView) { 78 | _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:self.simpleLayout]; 79 | _collectionView.translatesAutoresizingMaskIntoConstraints = NO; 80 | _collectionView.delegate = self; 81 | _collectionView.dataSource = self; 82 | _collectionView.backgroundColor = [UIColor clearColor]; 83 | NSDictionary *contentInset = [self.inputInfo objectForKey:@"content_inset"]; 84 | _collectionView.contentInset = UIEdgeInsetsMake([[contentInset objectForKey:@"top"] floatValue], 85 | [[contentInset objectForKey:@"left"] floatValue], 86 | [[contentInset objectForKey:@"bottom"] floatValue], 87 | [[contentInset objectForKey:@"right"] floatValue]); 88 | } 89 | return _collectionView; 90 | } 91 | 92 | - (MONUniformFlowLayout *)simpleLayout { 93 | if (!_simpleLayout) { 94 | _simpleLayout = [[MONUniformFlowLayout alloc] init]; 95 | NSDictionary *itemSpacingInfo = [self.inputInfo objectForKey:@"item_spacing"]; 96 | _simpleLayout.interItemSpacing = MONInterItemSpacingMake([[itemSpacingInfo objectForKey:@"horizontal"] floatValue], 97 | [[itemSpacingInfo objectForKey:@"vertical"] floatValue]); 98 | _simpleLayout.enableStickyHeader = [[self.inputInfo objectForKey:@"sticky_header"] boolValue]; 99 | } 100 | return _simpleLayout; 101 | } 102 | 103 | #pragma mark - 104 | #pragma mark - Collection View Delegate 105 | 106 | - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView 107 | cellForItemAtIndexPath:(NSIndexPath *)indexPath { 108 | CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kCollectionViewCellIdentifier forIndexPath:indexPath]; 109 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 110 | NSDictionary *sectionDetails = [sections objectAtIndex:indexPath.section]; 111 | cell.backgroundColor = [self colorWithHexString:[sectionDetails objectForKey:@"item_color"]]; 112 | return cell; 113 | } 114 | 115 | - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { 116 | UIViewController *vc = [UIViewController new]; 117 | vc.view.backgroundColor = [UIColor lightGrayColor]; 118 | [self.navigationController pushViewController:vc animated:YES]; 119 | } 120 | 121 | - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView 122 | viewForSupplementaryElementOfKind:(NSString *)kind 123 | atIndexPath:(NSIndexPath *)indexPath { 124 | UICollectionReusableView *reusableView = nil; 125 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 126 | NSDictionary *sectionDetails = [sections objectAtIndex:indexPath.section]; 127 | 128 | if ([kind isEqualToString:UICollectionElementKindSectionHeader]) { 129 | CollectionHeaderView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:kCollectionViewSectionHeaderIdentifier forIndexPath:indexPath]; 130 | headerView.backgroundColor = [self colorWithHexString:[sectionDetails objectForKey:@"header_color"]]; 131 | reusableView = headerView; 132 | } else if ([kind isEqualToString:UICollectionElementKindSectionFooter]) { 133 | CollectionFooterView *footerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:kCollectionViewSectionFooterIdentifier forIndexPath:indexPath]; 134 | footerView.backgroundColor = [self colorWithHexString:[sectionDetails objectForKey:@"footer_color"]]; 135 | reusableView = footerView; 136 | } 137 | 138 | return reusableView; 139 | } 140 | 141 | #pragma mark - 142 | #pragma mark - Collection View Data Source 143 | 144 | - (NSInteger)collectionView:(UICollectionView *)collectionView 145 | numberOfItemsInSection:(NSInteger)section { 146 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 147 | NSDictionary *sectionDetails = [sections objectAtIndex:section]; 148 | return [[sectionDetails objectForKey:@"number_of_items"] integerValue]; 149 | } 150 | 151 | - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { 152 | return [[self.inputInfo objectForKey:@"sections"] count]; 153 | } 154 | 155 | #pragma mark - 156 | #pragma mark - Get Number of Columns 157 | 158 | - (NSUInteger)getNumberOfColumnsInSection:(NSInteger)section { 159 | UIDevice *device = [UIDevice currentDevice]; 160 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 161 | NSDictionary *sectionDetails = [sections objectAtIndex:section]; 162 | if (UIDeviceOrientationIsLandscape(device.orientation)) { 163 | return [[sectionDetails objectForKey:@"landscape_number_of_columns"] floatValue]; 164 | } else { 165 | return [[sectionDetails objectForKey:@"portrait_number_of_columns"] floatValue]; 166 | } 167 | } 168 | 169 | #pragma mark - 170 | #pragma mark - Simple Flow Layout Delegate 171 | 172 | - (CGFloat)collectionView:(UICollectionView *)collectionView 173 | layout:(MONUniformFlowLayout *)layout 174 | itemHeightInSection:(NSInteger)section { 175 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 176 | NSDictionary *sectionDetails = [sections objectAtIndex:section]; 177 | return [[sectionDetails objectForKey:@"item_height"] floatValue]; 178 | } 179 | 180 | - (CGFloat)collectionView:(UICollectionView *)collectionView 181 | layout:(MONUniformFlowLayout *)layout 182 | headerHeightInSection:(NSInteger)section { 183 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 184 | NSDictionary *sectionDetails = [sections objectAtIndex:section]; 185 | return [[sectionDetails objectForKey:@"header_height"] floatValue]; 186 | } 187 | 188 | - (CGFloat)collectionView:(UICollectionView *)collectionView 189 | layout:(MONUniformFlowLayout *)layout 190 | footerHeightInSection:(NSInteger)section { 191 | NSArray *sections = [self.inputInfo objectForKey:@"sections"]; 192 | NSDictionary *sectionDetails = [sections objectAtIndex:section]; 193 | return [[sectionDetails objectForKey:@"footer_height"] floatValue]; 194 | } 195 | 196 | - (CGFloat)collectionView:(UICollectionView *)collectionView 197 | sectionSpacingForlayout:(MONUniformFlowLayout *)layout { 198 | return [[self.inputInfo objectForKey:@"section_spacing"] floatValue]; 199 | } 200 | 201 | - (NSUInteger)collectionView:(UICollectionView *)collectionView 202 | layout:(MONUniformFlowLayout *)layout 203 | numberOfColumnsInSection:(NSInteger)section { 204 | return [self getNumberOfColumnsInSection:section]; 205 | } 206 | 207 | #pragma mark - 208 | #pragma mark - Convert Hext String to Color 209 | 210 | - (UIColor *)colorWithHexString:(NSString *)stringToConvert { 211 | NSString *noHashString = [stringToConvert stringByReplacingOccurrencesOfString:@"#" withString:@""]; // remove the # 212 | NSScanner *scanner = [NSScanner scannerWithString:noHashString]; 213 | [scanner setCharactersToBeSkipped:[NSCharacterSet symbolCharacterSet]]; // remove + and $ 214 | 215 | unsigned hex; 216 | if (![scanner scanHexInt:&hex]) return nil; 217 | int r = (hex >> 16) & 0xFF; 218 | int g = (hex >> 8) & 0xFF; 219 | int b = (hex) & 0xFF; 220 | 221 | return [UIColor colorWithRed:r / 255.0f green:g / 255.0f blue:b / 255.0f alpha:1.0f]; 222 | } 223 | 224 | @end 225 | -------------------------------------------------------------------------------- /MONUniformFlowLayout/MONUniformFlowLayout.m: -------------------------------------------------------------------------------- 1 | // 2 | // MONUniformFlowLayout.m 3 | // 4 | // Created by mownier on 12/2/14. 5 | // Copyright (c) 2014 mownier. All rights reserved. 6 | // 7 | 8 | #import "MONUniformFlowLayout.h" 9 | 10 | @interface MONUniformFlowLayout () 11 | 12 | /// Used to get the content height of the collection view 13 | @property (readonly, nonatomic) CGFloat collectionViewContentHeight; 14 | 15 | /// Used to get the width of the section's header 16 | @property (readonly, nonatomic) CGFloat headerWidth; 17 | 18 | /// Used to get the width of the section's footer 19 | @property (readonly, nonatomic) CGFloat footerWidth; 20 | 21 | /// Used to get the number of sections 22 | @property (readonly, nonatomic) NSInteger numberOfSections; 23 | 24 | /// Used to get the spacing between sections 25 | @property (readonly, nonatomic) CGFloat sectionSpacing; 26 | 27 | /** 28 | * Computes the height of an item in a section 29 | * @param section The section that needs the height for it's item 30 | * @return The height for all items in a section 31 | */ 32 | - (CGFloat)computeItemHeightInSection:(NSInteger)section; 33 | 34 | /** 35 | * Computes the total spacing (origin-y) between items in a section 36 | * @param section The section that needs the total spacing between items 37 | * @return The total spacing between items in a section 38 | */ 39 | - (CGFloat)computeTotalInterItemSpacingYInSection:(NSInteger)section; 40 | 41 | /** 42 | * Computes the total height for all the items in a section 43 | * @param section The section that needs the total height for all items 44 | * @return The total height for all items in a section 45 | */ 46 | - (CGFloat)computeTotalItemHeightInSection:(NSInteger)section; 47 | 48 | /** 49 | * Computes the origin-y of an item in a section 50 | * @param section The section that needs the origin-y of an item 51 | * @return The origin-y of an item in a section 52 | */ 53 | - (CGFloat)computePositionYInSection:(NSInteger)section; 54 | 55 | /** 56 | * Computes the origin-y of the header in a section 57 | * @param section The section that needs the origin-y of the header 58 | * @return The origin-y of the header in a section 59 | */ 60 | - (CGFloat)computeHeaderPositionYInSection:(NSInteger)section; 61 | 62 | /** 63 | * Computes the origin-y of the footer in a section 64 | * @param section The section that needs the origin-y of the footer 65 | * @return The origin-y of the footer in a section 66 | */ 67 | - (CGFloat)computeFooterPositionYInSection:(NSInteger)section; 68 | 69 | /** 70 | * Gets the number of rows in a section 71 | * @param section The section that needs it's number of rows 72 | * @return Number of rows in a section 73 | */ 74 | - (NSInteger)getNumberOfRowsInSection:(NSInteger)section; 75 | 76 | /** 77 | * Gets the number of items in a section 78 | * @param section The section that needs it's number of items 79 | * @return Number of items in a section 80 | */ 81 | - (NSInteger)getNumberOfItemsInSection:(NSInteger)section; 82 | 83 | /** 84 | * Gets the number of columns in a section 85 | * @param section The section that needs it's number of columns 86 | # @return Number of columns in a section 87 | */ 88 | - (NSInteger)getNumberOfColumnsInSection:(NSInteger)section; 89 | 90 | /** 91 | * Gets the height of the section's header 92 | * @param section The section that needs the header height 93 | * @return Height of the header in a section 94 | */ 95 | - (CGFloat)getHeaderHeightInSection:(NSInteger)section; 96 | 97 | /** 98 | * Gets the height of the section's footer 99 | * @param section The section that needs the footer height 100 | * @return Height of the footer in a section 101 | */ 102 | - (CGFloat)getFooterHeightInSection:(NSInteger)section; 103 | 104 | /** 105 | * Modifies the attributes of an item relative to the collection view 106 | * @param indexPath The targeted indexPath of the item's attributes to modify 107 | */ 108 | - (void)modifyItemAttributes:(UICollectionViewLayoutAttributes *)attributes indexPath:(NSIndexPath *)indexPath; 109 | 110 | /** 111 | * Modifies the attributes of a section's header relative to the collection view 112 | * @param section The section of the header's attributes to modify 113 | */ 114 | - (void)modifyHeaderAttributes:(UICollectionViewLayoutAttributes *)attributes section:(NSInteger)section; 115 | 116 | /** 117 | * Modifies the attributes of a section's footer relative to the collection view 118 | * @param section The section of the footer's attributes to modify 119 | */ 120 | - (void)modifyFooterAttributes:(UICollectionViewLayoutAttributes *)attributes section:(NSInteger)section; 121 | 122 | @end 123 | 124 | @implementation MONUniformFlowLayout 125 | 126 | #pragma mark - 127 | #pragma mark - Layout 128 | 129 | - (void)prepareLayout { 130 | [super prepareLayout]; 131 | } 132 | 133 | #pragma mark - 134 | #pragma mark - Attributes Modification 135 | 136 | - (void)modifyItemAttributes:(UICollectionViewLayoutAttributes *)attributes indexPath:(NSIndexPath *)indexPath { 137 | NSUInteger numberOfColumnsInSection = [self getNumberOfColumnsInSection:indexPath.section]; 138 | assert(numberOfColumnsInSection > 0); 139 | NSInteger currentSection = indexPath.section; 140 | NSInteger currentRow = indexPath.row / numberOfColumnsInSection; 141 | NSInteger currentColumn = indexPath.row % numberOfColumnsInSection; 142 | 143 | CGRect frame = attributes.frame; 144 | 145 | frame.origin.x = (self.interItemSpacing.x * currentColumn) + ([self computeItemWidthInSection:currentSection] * currentColumn); 146 | frame.origin.y = [self computePositionYInSection:currentSection] + (self.interItemSpacing.y * currentRow) + ([self computeItemHeightInSection:currentSection] * currentRow); 147 | frame.size.width = [self computeItemWidthInSection:currentSection]; 148 | frame.size.height = [self computeItemHeightInSection:currentSection]; 149 | 150 | attributes.frame = frame; 151 | } 152 | 153 | - (void)modifyHeaderAttributes:(UICollectionViewLayoutAttributes *)attributes section:(NSInteger)section { 154 | CGRect frame = attributes.frame; 155 | frame.origin.x = -self.collectionView.contentInset.left; 156 | frame.origin.y = [self computeHeaderPositionYInSection:section]; 157 | frame.size.width = self.headerWidth; 158 | frame.size.height = [self getHeaderHeightInSection:section]; 159 | attributes.frame = frame; 160 | attributes.zIndex = 1024; 161 | } 162 | 163 | - (void)modifyFooterAttributes:(UICollectionViewLayoutAttributes *)attributes section:(NSInteger)section { 164 | CGRect frame = attributes.frame; 165 | frame.origin.x = -self.collectionView.contentInset.left; 166 | frame.origin.y = [self computeFooterPositionYInSection:section]; 167 | frame.size.width = self.footerWidth; 168 | frame.size.height = [self getFooterHeightInSection:section]; 169 | attributes.frame = frame; 170 | attributes.zIndex = 1024; 171 | } 172 | 173 | - (UICollectionViewLayoutAttributes *)layoutAttributesForSupplementaryViewOfKind:(NSString *)elementKind 174 | atIndexPath:(NSIndexPath *)indexPath { 175 | if ([elementKind isEqualToString:UICollectionElementKindSectionHeader]) { 176 | UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionHeader withIndexPath:indexPath]; 177 | [self modifyHeaderAttributes:attributes section:indexPath.section]; 178 | return attributes; 179 | } else if ([elementKind isEqualToString:UICollectionElementKindSectionFooter]) { 180 | UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionFooter withIndexPath:indexPath]; 181 | 182 | [self modifyFooterAttributes:attributes section:indexPath.section]; 183 | return attributes; 184 | } 185 | return nil; 186 | } 187 | 188 | - (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath { 189 | UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath]; 190 | [self modifyItemAttributes:attributes indexPath:indexPath]; 191 | return attributes; 192 | } 193 | 194 | - (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect { 195 | NSMutableArray *allAttributesInRect = [NSMutableArray new]; 196 | 197 | NSUInteger numberOfSections = self.numberOfSections; 198 | for (int section = 0; section < numberOfSections; section++) { 199 | NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:section]; 200 | 201 | UICollectionViewLayoutAttributes *headerAttributes = [self layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionHeader atIndexPath:indexPath]; 202 | if (headerAttributes && CGRectIntersectsRect(headerAttributes.frame, rect)) { 203 | [allAttributesInRect addObject:headerAttributes]; 204 | } 205 | 206 | UICollectionViewLayoutAttributes *footerAttributes = [self layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionFooter atIndexPath:indexPath]; 207 | if (footerAttributes && CGRectIntersectsRect(footerAttributes.frame, rect)) { 208 | [allAttributesInRect addObject:footerAttributes]; 209 | } 210 | 211 | NSUInteger numberOfItems = [self getNumberOfItemsInSection:section]; 212 | for (int item = 0; item < numberOfItems; item++) { 213 | NSIndexPath *indexPath = [NSIndexPath indexPathForRow:item inSection:section]; 214 | UICollectionViewLayoutAttributes *attributes = [self layoutAttributesForItemAtIndexPath:indexPath]; 215 | if (CGRectIntersectsRect(attributes.frame, rect)) { 216 | [allAttributesInRect addObject:attributes]; 217 | } 218 | } 219 | } 220 | 221 | return allAttributesInRect; 222 | } 223 | 224 | #pragma mark - 225 | #pragma mark - Content Size 226 | 227 | - (CGSize)collectionViewContentSize { 228 | CGSize contentSize = [super collectionViewContentSize]; 229 | contentSize.height = self.collectionViewContentHeight; 230 | return contentSize; 231 | } 232 | 233 | - (CGFloat)collectionViewContentHeight { 234 | NSInteger lastSection = self.numberOfSections - 1; 235 | CGFloat height = [self computePositionYInSection:lastSection] + [self getFooterHeightInSection:lastSection] + [self computeTotalInterItemSpacingYInSection:lastSection] + [self computeTotalItemHeightInSection:lastSection]; 236 | return height; 237 | } 238 | 239 | #pragma mark - 240 | #pragma mark - Header and Footer 241 | 242 | - (CGFloat)headerWidth { 243 | return self.collectionView.frame.size.width; 244 | } 245 | 246 | - (CGFloat)footerWidth { 247 | return self.collectionView.frame.size.width; 248 | } 249 | 250 | - (CGFloat)getHeaderHeightInSection:(NSInteger)section { 251 | if (section < 0) { 252 | return 0; 253 | } 254 | id delegate = (id)self.collectionView.delegate; 255 | CGFloat headerHeight = 0; 256 | if (delegate && [delegate respondsToSelector:@selector(collectionView:layout:headerHeightInSection:)]) { 257 | headerHeight = [delegate collectionView:self.collectionView layout:self headerHeightInSection:section]; 258 | } 259 | return headerHeight; 260 | } 261 | 262 | - (CGFloat)getFooterHeightInSection:(NSInteger)section { 263 | if (section < 0) { 264 | return 0; 265 | } 266 | id delegate = (id)self.collectionView.delegate; 267 | CGFloat footerHeight = 0; 268 | if (delegate && [delegate respondsToSelector:@selector(collectionView:layout:footerHeightInSection:)]) { 269 | footerHeight = [delegate collectionView:self.collectionView layout:self footerHeightInSection:section]; 270 | } 271 | return footerHeight; 272 | } 273 | 274 | - (CGFloat)computeFooterPositionYInSection:(NSInteger)section { 275 | if (section < 0) { 276 | return 0; 277 | } 278 | // y-position of last row in section + itemHeightInSection + footerHeightInSection 279 | NSInteger lastRow = [self getNumberOfRowsInSection:section] - 1; 280 | CGFloat posiitonY = ([self computePositionYInSection:section] + (self.interItemSpacing.y * lastRow) + ([self computeItemHeightInSection:section] * lastRow)) + [self computeItemHeightInSection:section]; 281 | return posiitonY; 282 | } 283 | 284 | - (CGFloat)computeHeaderPositionYInSection:(NSInteger)section { 285 | if (section < 0) { 286 | return 0; 287 | } 288 | // y-position of the first row in section - headerHeightInSection 289 | CGFloat positionY = [self computePositionYInSection:section] - [self getHeaderHeightInSection:section]; 290 | if (self.enableStickyHeader) { 291 | CGFloat offsetY = self.collectionView.contentOffset.y; 292 | CGFloat offsetYToStick = positionY - self.collectionView.contentInset.top; 293 | CGFloat offsetYToGetOff = [self computeFooterPositionYInSection:section] - [self getHeaderHeightInSection:section] - self.collectionView.contentInset.top; 294 | if (offsetY >= offsetYToStick && offsetY < offsetYToGetOff) { 295 | return self.collectionView.contentInset.top + self.collectionView.contentOffset.y; 296 | } else if (offsetY >= offsetYToGetOff) { 297 | return self.collectionView.contentInset.top + self.collectionView.contentOffset.y - (offsetY - offsetYToGetOff); // (scrollUp1: -1, scrollUp2: -2, scrollUp3: -3) 298 | } 299 | } 300 | return positionY; 301 | } 302 | 303 | #pragma mark - 304 | #pragma mark - Item Size in Section 305 | 306 | - (CGFloat)computeItemWidthInSection:(NSInteger)section { 307 | if (section < 0) { 308 | return 0.0f; 309 | } 310 | NSUInteger numberOfColumnsInSection = [self getNumberOfColumnsInSection:section]; 311 | CGFloat deductions = self.collectionView.contentInset.left + self.collectionView.contentInset.right + (self.interItemSpacing.x * (numberOfColumnsInSection - 1)); 312 | CGFloat width = (self.collectionView.frame.size.width - deductions) / numberOfColumnsInSection; 313 | return width; 314 | } 315 | 316 | - (CGFloat)computeItemHeightInSection:(NSInteger)section { 317 | if (section < 0) { 318 | return 0.0f; 319 | } 320 | id delegate = (id)self.collectionView.delegate; 321 | CGFloat height = 0; 322 | if (delegate && [delegate respondsToSelector:@selector(collectionView:layout:itemHeightInSection:)]) { 323 | height = [delegate collectionView:self.collectionView layout:self itemHeightInSection:section]; 324 | } 325 | return height; 326 | } 327 | 328 | #pragma mark - 329 | #pragma mark - Number of Items 330 | 331 | - (NSInteger)getNumberOfItemsInSection:(NSInteger)section { 332 | if (section < 0) { 333 | return 0; 334 | } 335 | NSInteger numberOfItems = [self.collectionView.dataSource collectionView:self.collectionView numberOfItemsInSection:section]; 336 | return numberOfItems; 337 | } 338 | 339 | #pragma mark - 340 | #pragma mark - Sections 341 | 342 | - (NSInteger)numberOfSections { 343 | NSInteger numberOfSections = 1; 344 | if (self.collectionView && self.collectionView.dataSource && [self.collectionView.dataSource respondsToSelector:@selector(numberOfSectionsInCollectionView:)]) { 345 | numberOfSections = [self.collectionView.dataSource numberOfSectionsInCollectionView:self.collectionView]; 346 | } 347 | return numberOfSections; 348 | } 349 | 350 | - (CGFloat)sectionSpacing { 351 | id delegate = (id)self.collectionView.delegate; 352 | CGFloat sectionSpacing = 0; 353 | if (delegate && [delegate respondsToSelector:@selector(collectionView:sectionSpacingForlayout:)]) { 354 | sectionSpacing = [delegate collectionView:self.collectionView sectionSpacingForlayout:self]; 355 | } 356 | return sectionSpacing; 357 | } 358 | 359 | #pragma mark - 360 | #pragma mark - Rows 361 | 362 | - (NSInteger)getNumberOfRowsInSection:(NSInteger)section { 363 | if (section < 0) { 364 | return 0; 365 | } 366 | NSInteger numberOfItems = [self getNumberOfItemsInSection:section]; 367 | NSInteger numberOfRows = ceil(numberOfItems / ([self getNumberOfColumnsInSection:section] * 1.0f)); 368 | return numberOfRows; 369 | } 370 | 371 | #pragma mark - 372 | #pragma mark - Columns 373 | 374 | - (NSInteger)getNumberOfColumnsInSection:(NSInteger)section { 375 | if (section < 0) { 376 | return 0; 377 | } 378 | id delegate = (id)self.collectionView.delegate; 379 | NSInteger numberOfColumns = 1; 380 | if (delegate && [delegate respondsToSelector:@selector(collectionView:layout:numberOfColumnsInSection:)]) { 381 | numberOfColumns = [delegate collectionView:self.collectionView layout:self numberOfColumnsInSection:section]; 382 | } 383 | return numberOfColumns; 384 | } 385 | 386 | #pragma mark - 387 | #pragma mark - Inter Item Spacing 388 | 389 | - (CGFloat)computeTotalInterItemSpacingYInSection:(NSInteger)section { 390 | if (section < 0) { 391 | return 0; 392 | } 393 | NSInteger numberOfRowsInSection = [self getNumberOfRowsInSection:section]; 394 | CGFloat totalInterItemSpacingYInSection = (self.interItemSpacing.y * (numberOfRowsInSection - 1)); 395 | return totalInterItemSpacingYInSection; 396 | } 397 | 398 | #pragma mark - 399 | #pragma mark - Total Height In Section 400 | 401 | - (CGFloat)computeTotalItemHeightInSection:(NSInteger)section { 402 | if (section < 0) { 403 | return 0; 404 | } 405 | NSInteger numberOfRowsInSection = [self getNumberOfRowsInSection:section]; 406 | CGFloat itemHeight = [self computeItemHeightInSection:section]; 407 | CGFloat totalHeightInSection = itemHeight * numberOfRowsInSection; 408 | return totalHeightInSection; 409 | } 410 | 411 | #pragma mark - 412 | #pragma mark - Overidden Setters and Getterss 413 | 414 | - (void)setInterItemSpacing:(MONInterItemSpacing)interItemSpacing { 415 | _interItemSpacing = interItemSpacing; 416 | [self invalidateLayout]; 417 | } 418 | 419 | #pragma mark - 420 | #pragma mark - Position Y Computation 421 | 422 | - (CGFloat)computePositionYInSection:(NSInteger)section { 423 | CGFloat totalInterSectionSpacing = self.sectionSpacing * section; 424 | CGFloat totalInterItemSpacingY = 0; 425 | CGFloat totalSectionItemHeight = 0; 426 | CGFloat totalHeaderHeight = [self getHeaderHeightInSection:section]; 427 | CGFloat totalFooterHeight = 0; 428 | 429 | for (NSInteger i = 0; i < section; i++) { 430 | totalInterItemSpacingY += [self computeTotalInterItemSpacingYInSection:i]; 431 | totalSectionItemHeight += [self computeTotalItemHeightInSection:i]; 432 | totalHeaderHeight += [self getHeaderHeightInSection:i]; 433 | totalFooterHeight += [self getFooterHeightInSection:i]; 434 | } 435 | 436 | CGFloat positionY = totalSectionItemHeight + totalInterSectionSpacing + totalInterItemSpacingY + totalHeaderHeight + totalFooterHeight; 437 | return positionY; 438 | } 439 | 440 | #pragma mark - 441 | #pragma mark - Invalidate Layout 442 | 443 | - (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds { 444 | return YES; 445 | } 446 | 447 | @end 448 | -------------------------------------------------------------------------------- /MONUniformFlowLayoutSample.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 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