TouchDown:在控件窗口内单点触摸按下
TouchDownRepeat:在控件窗口内多点触摸按下(即点触计数大于1)
TouchCancel:在控件窗口内因为系统事件将当前所有触摸取消(如手机被锁屏、有电话呼入)
[依据] 来自Apple官方文档 UIControlEvents:
UIControlEventTouchDown:A touch-down event in the control.
UIControlEventTouchDownRepeat:A repeated touch-down event in the control; for this event the value of the UITouch tapCount method is greater than one.
UIControlEventTouchCancel:A system event canceling the current touches for the control.
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