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UIButtonの上にUIPanGestureRecognizerを置いたとき、UIButtonにはどういうイベントが発生するのか

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概要

UIPanGestureRecognizer(ドラッグ・スワイプ)を使った挙動を実装する必要があった。
しかしその領域にはUIButtonがあったのだった。

UIButtonの上で、UIPanGestureRecognizerに拾われる操作をしたとき、
一体UIButtonにはどんなイベント(UIControlEvents)が走るのか?

結論

[self.button addTarget:self action:@selector(cancelButton) forControlEvents:UIControlEventTouchCancel];

UIPanGestureRecognizerに操作が拾われた場合、UIButtonには上記のイベントが走る。

UIControlEventTouchCancel は キャンセルイベントが発生したときのイベント名だけど
こういうときに動くらしい。

UIControlEventTouchDown // これはUIPanGestureRecognizerで拾われるドラッグ操作するとき、最初のタップ時にイベント発生。
UIControlEventTouchUpOutside // これは発生しない
UIControlEventTouchDragExit // これも発生しない

こういうイベントとは別になるので要注意だった。

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