Returns a Boolean indicating whether changes to a cell’s layout attributes trigger a larger layout update.
- macOS 10.11+
The preferred layout attributes of an element.
The attributes that the layout object originally suggested for the item.
true if the layout should be invalidated or
false if it should not.
The default implementation of this method returns NO to indicate that layout is not needed. You can override this method in your custom layout classes and return a different value as needed. Your implementation of this method should determine if the new attributes would cause changes to the layout of other portions of the collection view.
If you return
true from this method, the collection view invalidates the layout using the
invalidate method. The invalidation context passed to that method is created using the