iOS UICollectionView之-(水平滚动)
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#import <UIKit/UIKit.h> @interface AppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @end
#import "AppDelegate.h" #import "RootViewController.h" @interface AppDelegate () @end @implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. self.window.backgroundColor = [UIColor whiteColor]; self.window.rootViewController = [[RootViewController alloc] init]; [self.window makeKeyAndVisible]; return YES; } @end
#import <UIKit/UIKit.h> @interface RootViewController : UIViewController @end
#import "RootViewController.h" @interface RootViewController ()<UICollectionViewDataSource,UICollectionViewDelegate> { } @end static NSString *identifier = @"cell"; @implementation RootViewController - (void)viewDidLoad { [super viewDidLoad]; //创建布局对象 UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; // 设置滚动的方向 [layout setScrollDirection:UICollectionViewScrollDirectionHorizontal]; //行的间隙 // layout.minimumLineSpacing = 10; //列的间隙 layout.minimumInteritemSpacing = 10; //item的大小 layout.itemSize = CGSizeMake(100, 150); //创建collectionView UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 60, [UIScreen mainScreen].bounds.size.width, 150) collectionViewLayout:layout]; collectionView.backgroundColor = [UIColor greenColor]; // 设置代理 collectionView.dataSource = self; collectionView.delegate = self; //告诉系统将来需要创建什么样的cell(在获取cell之前必须先注册一个cell到系统中) [collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:identifier]; [self.view addSubview:collectionView]; } // 告诉系统一共有多少组 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{ return 1; } // 告诉系统第section组有多少行 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ return 15; } // 告诉系统indexPath的第Section组的item行显示什么内容 - (UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath]; cell.backgroundColor = [UIColor redColor]; return cell; } - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ NSLog(@"==%lu",indexPath.row); } @end
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