732. Pro iOS Table Views and Collection Views-代码介绍17
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http://v.youku.com/v_show/id_XMTcxMzEyOTAzNg==.html?beta&CHAPTER 17: Animated and Interactive Collection Viewsadd Gesture call invalidateLayout()func prepareForCollectionViewUpdates(updateItems: [UICollectionViewUpdateItem])func initialLayoutAttributesForAppearingItemAtIndexPath(itemIndexPath: NSIndexPath) -> UICollectionViewLayoutAttributes?func finalLayoutAttributesForDisappearingItemAtIndexPath(itemIndexPath: NSIndexPath) -> UICollectionViewLayoutAttributes?