CollectionViewLayoutDemo

UIcollectionView 自定义布局及切换

系统默认 UICollectionViewLayout

layout3 = UICollectionViewFlowLayout()
layout3.itemSize = CGSize(width: (self.view.bounds.size.width/2-20), height: 200)
// layout3... 或者通过代理 UICollectionViewDelegateFlowLayout 方法去实现

自定义 UICollectionViewLayout

重写 layoutAttributesForElements 和 layoutAttributesForItem 设置 frame

自定义 UICollectionViewFlowLayout

重写 prepare 设置 frame

切换 Layout

if tag == 1{
    collectView.setCollectionViewLayout(layout1, animated: true)
}else if tag == 2{
    collectView.setCollectionViewLayout(layout2, animated: true)
}else {
    collectView.setCollectionViewLayout(layout3, animated: true)
}

Requirements

• Swift 4
• iOS 10+
• Xcode 9+

鸣谢

• http://www.hangge.com/blog/cache/detail_1594.html
• http://www.hangge.com/blog/cache/detail_591.html
• https://www.cnblogs.com/tinych/p/6893074.html