直接上代码,说明请看注释吧
ViewController.h
#import <UIKit/UIKit.h> @interface ViewController : UIViewController<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>{ } @property (strong, nonatomic)UICollectionView *collectionView; @end
ViewController.m
#import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //确定是水平滚动,还是垂直滚动 UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayout alloc] init]; [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical]; self.collectionView=[[UICollectionView alloc] initWithFrame:CGRectMake(0, 64, 320, 200) collectionViewLayout:flowLayout]; self.collectionView.dataSource=self; self.collectionView.delegate=self; [self.collectionView setBackgroundColor:[UIColor clearColor]]; //注册Cell,必须要有 [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"UICollectionViewCell"]; [self.view addSubview:self.collectionView]; } #pragma mark -- UICollectionViewDataSource //定义展示的UICollectionViewCell的个数 -(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return 10; } //定义展示的Section的个数 -(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 2; } //每个UICollectionView展示的内容 -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { static NSString * CellIdentifier = @"UICollectionViewCell"; UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath]; cell.backgroundColor = [UIColor colorWithRed:((10 * indexPath.row) / 255.0) green:((20 * indexPath.row)/255.0) blue:((30 * indexPath.row)/255.0) alpha:1.0f]; UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 20, 20)]; label.textColor = [UIColor redColor]; label.text = [NSString stringWithFormat:@"%d",indexPath.row]; for (id subView in cell.contentView.subviews) { [subView removeFromSuperview]; } [cell.contentView addSubview:label]; return cell; } #pragma mark --UICollectionViewDelegateFlowLayout //定义每个Item 的大小 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { return CGSizeMake(60, 60); } //定义每个UICollectionView 的 margin -(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { return UIEdgeInsetsMake(5, 5, 5, 5); } #pragma mark --UICollectionViewDelegate //UICollectionView被选中时调用的方法 -(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell * cell = (UICollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath]; //临时改变个颜色,看好,只是临时改变的。如果要永久改变,可以先改数据源,然后在cellForItemAtIndexPath中控制。(和UITableView差不多吧!O(∩_∩)O~) cell.backgroundColor = [UIColor greenColor]; NSLog(@"item======%d",indexPath.item); NSLog(@"row=======%d",indexPath.row); NSLog(@"section===%d",indexPath.section); } //返回这个UICollectionView是否可以被选择 -(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath { return YES; } @end
时间: 2024-11-13 08:01:34