iOS开发之UICollectionViewController

// 1.创建流水布局
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];

 
// 2.设置每个格子的尺寸
layout.itemSize = CGSizeMake(250, 250);
 
// 3.设置整个collectionView的内边距
　　CGFloat paddingY = 20;
CGFloat paddingX = 40;
layout.sectionInset = UIEdgeInsetsMake(paddingY, paddingX, paddingY, paddingX);

 
// 4.设置每一行之间的间距
layout.minimumLineSpacing = paddingY;