本題
✎ UIResponderの処理を前提として、
どのような操作がされたかを判定
‘
The usual sequence of actions in gesture recognition follows a path determined by default
values of the cancelsTouchesInView, delaysTouchesBegan, delaysTouchesEnded
properties:
‘
UIResponderの
touchesCancel, touchesBegan, touchesMoved,
touchesEnded が前提