和表视图类似，集合视图是数据导向的对象，完成时候设计了你的应用对象之间的协作。
Like tables, collection views are data-oriented objects whose implementation involves a collaboration with your app's objects.
和表视图类似，集合视图是数据导向的对象，完成时候设计了你的应用对象之间的协作。
The UICollectionViewFlowLayout class is a concrete layout object that you use to implement grids or other line-based layouts.
和表视图类似，集合视图是数据导向的对象，完成时候设计了你的应用对象之间的协作。
The UICollectionViewFlowLayout class is a concrete layout object that you use to implement grids or other line-based layouts.
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