UIControlEvents包含Common, UISlider, UIButton, UITextField, Other几类。
Common UIControlEvents
| UIControlEvent | Condition |
|---|---|
| UIControlEventTouchDown | 在控件中按下未松开时触发 |
| UIControlEventTouchDownRepeat | 在控件中多次按下时触发 |
| UIControlEventTouchUpInside | 在控件中按下并松开时触发 |
| UIControlEventTouchUpOutside | 在控件中按下，移动到控件外松开时触发 |
| UIControlEventTouchDragInside | 在控件中按下并拖动时触发 |
| UIControlEventTouchDragOutside | 在控件中按下，移动到控件外拖动时触发 |
| UIControlEventTouchDragEnter | 在控件中按下并拖动到控件外，重新拖动回控件时触发 |
| UIControlEventTouchDragExit | 在控件中按下并拖动到控件外，离开控件时触发 |
| UIControlEventTouchCancel | 由于系统事件中断时触发，例如，控件被移除等 |
| UIControlEventAllTouchEvents | 所有TouchEvent都会触发 |
UISlider UIControlEvent
| UIControlEvent | Condition |
|---|---|
| UIControlEventValueChanged | UISlider滑动时触发 |
UIButton UIControlEvent
| UIControlEvent | Condition |
|---|---|
| UIControlEventPrimaryActionTriggered | UIButton上进行操作结束时触发，例如点击松开，拖动松开等 |
UITextField UIControlEvents
| UIControlEvent | Condition |
|---|---|
| UIControlEventEditingDidBegin | 弹出键盘，开始编辑时触发 |
| UIControlEventEditingChanged | 内容发生变化时触发 |
| UIControlEventEditingDidEnd | 收起键盘时触发 |
| UIControlEventEditingDidEndOnExit | 按下Return键时触发，随后收起键盘会触发UIControlEventEditingDidEnd |
| UIControlEventAllEditingEvents | 所有EditingEvent都会触发 |
Other UIControlEvents
| UIControlEvent | Condition |
|---|---|
| UIControlEventApplicationReserved | 保留值以便应用使用 |
| UIControlEventSystemReserved | 保留值以便系统使用 |
| UIControlEventAllEvents | 所有Event都会触发 |
举例说明
1.在UIButton中，按下并拖动到Button外松开，依次触发：
Down > DragInside > DragExit > DragOutside > UpOutside
2.在UIButton中，按下并拖动到Button外，再拖动回Button内松开，依次触发：
Down > DragInside > DragExit > DragOutside > DragEnter > DragInside > UpInside