Swift3.0学习之CollectionView的简单使用

1、设置layout

 let layout = UICollectionViewFlowLayout()
        layout.itemSize = CGSize(width:60,height: 80)                         //设置item尺寸
        layout.minimumLineSpacing = (UIScreen.main.bounds.width - 240) * 0.2  //上下间隔
        layout.minimumInteritemSpacing = (UIScreen.main.bounds.width - 240) * 0.1 //左右间隔
        layout.headerReferenceSize = CGSize(width:0,height:  0)   //头部间隔
        layout.footerReferenceSize = CGSize(width:0,height:  0)   //底部间隔
        layout.sectionInset = UIEdgeInsetsMake(, , , )            //section四周的缩进
        layout.scrollDirection = UICollectionViewScrollDirection.vertical  //滚动方向

2、初始化collectionview

 let myCollectionView = UICollectionView.init(frame: view.bounds, collectionViewLayout: layout)
        myCollectionView.delegate = self
        myCollectionView.backgroundCol