iOS 手势识别器概述

手势识别器

iOS 手势识别器(UIGestureRecognizer)

• 点击手势(UITapGestureRecognizer)
• 滑动手势(UISwipeGestureRecognizer)
• 旋转手势(UIRotationGestureRecognizer)
• 捏合手势( UIPinchGestureRecognizer)
• 长按手势( UILongPressGestureRecognizer)
• 平移手势( UIPanGestureRecognizer)
• 屏幕边缘平移手势(UIScreenEdgePanGestureRecognizer)

UIGestureRecognizer

其相应的方法:

- initWithTarget:action:
- addTarget:action:
- removeTarget:action:

- locationInView:
- locationOfTouch:inView:
- numberOfTouches

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属性:

• stated
• view
• enable
• cancelsTouchesInView

• delaysTouchesBegin

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  这里有一个方法,很重要,当你须要使用双击手势时,单击手势也会出现.这个时候就要使用以下的方法:

 - requireGestureRecognizerToFail:(eg: 单击须要双击失败)

UITapGestureRecognizer

• numberofTapsRequired (点击的次数)
• numberOfTouchesRequired (用的是几根手指)

UISwipeGestureRecognizer

• direction (移动的方向)
• numberOfTouchesRequired

UIRotationGestureRecognizer

• rotation (这里是旋转角度的绝对值,不是增量值,假设须要增量值,须要每次 rotation 置 0)
• velocity (每秒多少弧长, radius 为 1 )

UIPinchGestureRecognizer

• scale (假设 须要获得增量值,也须要 scale 置 1)
• velocity (每秒多少 scale)

UILongPressGestureRecognizer

• minimumPressDuration
• numberOfTouchesRequired
• numberOfTapsRequired
• alowableMovement(同意移动)

UIPanGestureRecognizer

• maximumNumberOfTouches
• minimumNumberOfTouches

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- translationinView:
- setTranslation:inView:
- velocityView:  (速度以 CGpoint 方式返回,能够分解为 x 和 y 两个方向的速度 )

UIScreenEdgePanGestureRecognizer

• edges

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这个手势与平移手势有些不同,它是以屏幕边缘的部分才干产生效果,一般使用时须要特殊处理,否则就会与平移手势产生冲突.由于它继承 UIPanGestureRecognizer

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