uibutton 事件

转自：http://blog.youkuaiyun.com/heng615975867/article/details/39321081?source=1

/**

101	* UIControlEventTouchDown           = 1 <<  0,      // on all touch downs

102	* UIControlEventTouchDownRepeat     = 1 <<  1,      // on multiple touchdowns (tap count > 1)

103	* UIControlEventTouchDragInside     = 1 <<  2,

104	* UIControlEventTouchDragOutside    = 1 <<  3,

105	* UIControlEventTouchDragEnter      = 1 <<  4,   // 注：我在模拟器上找了好久没找到这个东西什么时候触法

106	* UIControlEventTouchDragExit       = 1 <<  5,

107	* UIControlEventTouchUpInside       = 1 <<  6,

108	* UIControlEventTouchUpOutside      = 1 <<  7,

109	* UIControlEventTouchCancel         = 1 <<  8,

110	* 按下松开，依次触发：   TouchDown:      TouchUpInside:

111	* 按下并在按钮内部拖动最后松开，依次触发：  TouchDown:    TouchDragInside:(多次)    TouchUpInside:

112	* 按着按钮拖动到按钮外不远处，依次触发： TouchDown:    TouchDragInside:(多次)    TouchUpInside:

113	* 按着按钮拖动到按钮外很远处，依次触发： TouchDown:    TouchDragInside:(多次)    TouchDragExit:    TouchDragOutside:(多次)    TouchUpOutside:

114	* 快速双击两下，依次触发： TouchDown:    TouchUpInside:    TouchDown:    TouchDownRepeat:    TouchUpInside:

115	* 快速击三下，依次触发： TouchDown:    TouchUpInside:    TouchDown:    TouchDownRepeat:    TouchUpInside:    TouchDown:    TouchDownRepeat:    TouchUpInside:

116	* 长按会依次触发： TouchDown:    buttonLongPress:    TouchCancel:

117

*/

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