Instance Method

preferredLayoutAttributesFitting(_:)

Asks your element if it wants to modify any layout attributes before they are applied.

Declaration

optional func preferredLayoutAttributesFitting(_ layoutAttributes: NSCollectionViewLayoutAttributes) -> NSCollectionViewLayoutAttributes

Parameters

layoutAttributes

The attributes provided by the layout object. These attributes represent the values that the layout object intends to apply to the element.

Return Value

The final attributes to apply to the element.

Discussion

The default implementation of this method returns the same attributes that are in the layoutAttributes parameter. You can override this method in subclasses and use it to return a different set of attributes. If you override this method, call super first to give the system the opportunity to make changes, then modify the returned attributes.

Special Considerations

In OS X 10.11, this method is never called.

See Also

Managing Layout Changes

func apply(NSCollectionViewLayoutAttributes)

Applies the specified layout attributes to the element.

func willTransition(from: NSCollectionViewLayout, to: NSCollectionViewLayout)

Tells the element that the layout object of the collection view is about to change.

func didTransition(from: NSCollectionViewLayout, to: NSCollectionViewLayout)

Tells the element that the layout object of the collection view changed.