collectionView代码创建

@interface ViewController ()<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>

@property(nonatomic,strong)UICollectionView * collectionView;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc]init];

self.collectionView = [[UICollectionView alloc] initWithFrame: CGRectMake(10, 65, 屏幕宽度 - 20, 屏幕高度 - 65)

collectionViewLayout:layout];

self.collectionView.delegate = self;

self.collectionView.dataSource = self;

[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"UICollectionViewCell"];

self.collectionView.backgroundColor = [UIColor clearColor];

[self.view addSubview:self.collectionView];

}

#pragma mark UICollectionViewDataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

return 6;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"UICollectionViewCell" forIndexPath:indexPath];

//cell加载数据

return cell;

}

#pragma mark UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView

layout:(UICollectionViewLayout*)collectionViewLayout

sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

CGFloat w = (屏幕宽度 - 20 - 30 - 1) / 4;//每一行放四个

return CGSizeMake(w, w);

}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView

layout:(UICollectionViewLayout*)collectionViewLayout

insetForSectionAtIndex:(NSInteger)section{

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

}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{

return CGSizeMake(0, 10);

}

- (void)collectionView:(UICollectionView *)collectionView

didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

// 点击事件

}

@end