Changes to a data type that affect the layout of an object, such as data members of a class.
影响一个对象(如类的数据成员)布局的数据类型的更改。
You can use the class as-is or in conjunction with the flow delegate object, which allows you to customize the layout information dynamically.
你可以直接使用这个类或者实现流动代理对象，这样你就可以实现自定义动态布局。
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.
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。
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