Swift1.0〜2.0 タッチイベント (touchesBegan, touchesMoved, touchesEndedなど) 処理の変遷

変遷1

// Swift 1.0
touches: NSSet

// Swift 1.2
touches: Set<NSObject>

// Swift 2.0
touches: Set<UITouch>

変遷2

// Swift 2.0
UIEventの最後に?を追加

コード

Swift1.0

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { }
override func touchesMoved(touches: NSSet, withEvent event: UIEvent) { }
override func touchesEnded(touches: NSSet, withEvent event: UIEvent) { }

Swift1.2

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) { }
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) { }
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) { }

Swift2.0

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { }
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) { }
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) { }