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UIKit Changes for Swift

UIKit

Modified UICollectionViewUpdateItem
Declaration
From
class UICollectionViewUpdateItem : NSObject {
    var indexPathBeforeUpdate: NSIndexPath { get }
    var indexPathAfterUpdate: NSIndexPath { get }
    var updateAction: UICollectionUpdateAction { get }
}
To
class UICollectionViewUpdateItem : NSObject {
    var indexPathBeforeUpdate: NSIndexPath? { get }
    var indexPathAfterUpdate: NSIndexPath? { get }
    var updateAction: UICollectionUpdateAction { get }
}

Modified UICollectionViewUpdateItem.indexPathAfterUpdate
Declaration
From
var indexPathAfterUpdate: NSIndexPath { get }
To
var indexPathAfterUpdate: NSIndexPath? { get }

Modified UICollectionViewUpdateItem.indexPathBeforeUpdate
Declaration
From
var indexPathBeforeUpdate: NSIndexPath { get }
To
var indexPathBeforeUpdate: NSIndexPath? { get }