iOS Core Note--uicollectionview-Auxiliary view

iOS Core Note--uicollectionview-Auxiliary view 1, Uicollectionview auxiliary view:

?了解: The head view and the tail view in the Uicollectionview are all using 注册机制 + 重用机制 to improve the execution efficiency of the program, and the head and tail view types are: UICollectionReusableView . Registering a secondary view uses a string to differentiate whether the registered view is a header or trailer view, with a distinguished string of: UICollectionElementKindSectionHeader ( 头部视图 ), UICollectionElementKindSectionFooter ( 尾部视图 ).

1-1. Use Xib to describe the head view:

1-2, to the head view set reuse identity:

1-3. Register Head View:

?了解: The head and tail views in CollectionView are all using the registration mechanism + reuse mechanism, so you need to register ahead of time when using the Xib file to describe the head view.

1-4. Set head View size:

?了解: 布局对象 Sets the headerReferenceSize size of the footerReferenceSize head and tail view, respectively, of the used properties.

1-5. Return head View in data method:

?了解: In the data source method that returns the secondary view, you need to determine whether you are returning a head view or a trailer view.

iOS Core Note--uicollectionview-Auxiliary view