用于表现修改个人标签，使用UICollectionView实现，动态背景框使用UICollectionViewFlowLayout的DecorationView实现。
用于表现修改个人标签，使用UICollectionView实现，动态背景框使用UICollectionViewFlowLayout的DecorationView实现。
1.其中利用UICollectionView的特性，实现了标签插回原位的效果。
2.为了能利用UICollectionView动画特性，未选中和选中的标签在同一个UICollectionView中表现；这里会导致背景框跟随标签高度变化成了难点，好在UICollectionViewFlowLayout 提供了一个DecorationView 解决了此问题。
欢迎一起交流技术学习。
微博：AlienJunX
特别感谢：
https://github.com/s-atif-jamil/CollectionSectionView
还有一个可以给任何View添加类似nice 应用中的那种标签。
ExampleViewController 怎么用？
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