UICollectionViewController相关

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#UICollectionView

参考:http://blog.csdn.net/king2716/article/details/17485237

//取消所有选中状态

clearsSelectionOnViewWillAppear

//是否显示菜单

- (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath;

//菜单中哪些编辑操作可以显示

- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender;

//对于显示的编辑操作怎么执行

- (void)collectionView:(UICollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender

//选中时候触发

- (void)selectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(UICollectionViewScrollPosition)scrollPosition;

//取消选中时候触发仅在多选时候可用

- (void)deselectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated;

#UICollectionViewLayout相关

参考：http://blog.csdn.net/majiakun1/article/details/17204921

#UICollectionViewCell

//cell的背景，大小自动适应cell

backgroundView

//cell选中时候的背景

selectedBackgroundView

//自定义内容的容器

contentView

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