1、實(shí)現(xiàn)代理

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

@end

2、聲明UICollectionView

@property (nonatomic, strong) UICollectionView *myCollectionView;

3、實(shí)現(xiàn)代理方法

/**
  *數(shù)據(jù)源代理
  */
//返回個(gè)數(shù)
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

    return 50;
}

//返回單元格，自定義單元格很重要的部分
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cid forIndexPath:indexPath];
    cell.backgroundColor = [UIColor orangeColor];
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 80, 80)];
    imageView.image = [UIImage imageNamed:@"image.jpg"];
    [cell.contentView addSubview:imageView];
    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(100, 35, 100, 40)];
    label.text = @"路飛";
    label.textColor = [UIColor whiteColor];
    [cell.contentView addSubview:label];

    return cell;
}

 /**
  *布局代理
  */
//設(shè)置邊距
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{

    return UIEdgeInsetsMake(0, 0, 0, 0);
}

//設(shè)置item寬高
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

    return CGSizeMake(self.myCollectionView.bounds.size.width, 80);
}

//選擇item
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    cell.backgroundColor = [UIColor redColor];
    NSLog(@"選中了---> %lu", indexPath.row);
}

//點(diǎn)擊后的item
- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{
    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    cell.backgroundColor = [UIColor orangeColor];
}

4、綁定View

- (void)viewDidLoad {
    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.
    //布局
    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc]init];
    //創(chuàng)建CollectionView
    self.myCollectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(20, 30, self.view.bounds.size.width-40, self.view.bounds.size.height-60) collectionViewLayout:flowLayout];

    //注冊(cè)Cell單元
    [self.myCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:cid];

    self.myCollectionView.dataSource = self;
    self.myCollectionView.delegate = self;
    self.myCollectionView.backgroundColor = [UIColor whiteColor];

    [self.view addSubview:self.myCollectionView];
}