CollectionViewPreviewTransitionCell
public protocol CollectionViewPreviewTransitionCell : AnyObjectA protocol for CollectionViewCells that need to customize their transition when used in CollectionViewPreviewController.
If you adopt this protocol in a custom CollectionViewCell subclass, see the source code for CollectionViewPreviewCell for an example implementation.
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Called just before the transition animation to prepare the cell
Update the cell to prepare for transition from the item at indexPath in collectionView. Typically this will include fetching the layout attributes and/or cell using the provided index path and collection view, then applying the frame to self.
Declaration
Swift
func prepareForTransition(fromItemAt indexPath: IndexPath, in collectionView: CollectionView, to layoutAttributes: CollectionViewLayoutAttributes)Parameters
indexPathThe indexPath of the source cell
collectionViewThe source collection view
layoutAttributesThe final layout attributes for the receiver
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Called within the animation block in which the cell should moved from the source position to the destination position
Update the cell to position and style as needed to transition from it’s source. Typically this will include fetching the layout attributes and/or cell using the provided index path and collection view, then applying the frame to self.
Declaration
Swift
func transition(fromItemAt indexPath: IndexPath, in collectionView: CollectionView, to layoutAttributes: CollectionViewLayoutAttributes)Parameters
indexPathThe index path of the source item
collectionViewThe source collection view
layoutAttributesThe final layout attributes of the receiver
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Called when the transition from the source has completed and the cell is in it’s final position.
Declaration
Swift
func finishTransition(fromItemAt indexPath: IndexPath, in collectionView: CollectionView)Parameters
indexPathThe index path of the source item
collectionViewThe source collection view
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Called just before the cell is transitioned back to it’s source
Declaration
Swift
func prepareForTransition(toItemAt indexPath: IndexPath, in collectionView: CollectionView)Parameters
indexPathThe index path of the source item
collectionViewThe source collection view
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Called within the transition animation block in which the cell should move back to its source.
Update the cell to position and style as needed to transition back to it’s source. Typically this will include fetching the layout attributes and/or cell using the provided index path and collection view, then applying the frame to self.
Declaration
Swift
func transition(toItemAt indexPath: IndexPath, in collectionView: CollectionView)Parameters
indexPathThe index path of the source item
collectionViewThe source collection view
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Called when the transition back to the source has completed and the containing preview controller will be removed.
Declaration
Swift
func finishTransition(toItemAt indexPath: IndexPath, in collectView: CollectionView)Parameters
indexPathThe index path of the source item
collectionViewThe source collection view