Swift iOS- 手势检测详解

UIGestureRecognizer有许多子类,用于监听一些常见的手势事件,这些子类主要有:

1,UISwipeGestureRecognizer:滑动(快速移动)
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class ViewController : UIViewController {
override func viewDidLoad() {
super .viewDidLoad()
let swipe = UISwipeGestureRecognizer (target: self ,action: Selector ( "swipe:" ))
swipe.direction = UISwipeGestureRecognizerDirection . Up
.view.addGestureRecognizer(swipe)
}
swipe(recognizer: ){
print "swipe ok" )
var point=recognizer.locationInView( .view)
//这个点是滑动的起点
(point.x)
(point.y)
}
}
注意1:如果UISwipeGestureRecognizer在不指定方向的时候,默认向右滑动才会触发事件。如果要指定方向,需要设置direction属性
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//表示监听滑动的方向为向上
Up

注意2:有网友问如果各个方向都要响应怎么办,只要多定义几个UISwipeGestureRecognizer就可以了
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swipeUp = swipeUp.direction = UISwipeGestureRecognizerDirection .view.addGestureRecognizer(swipeUp)
swipeDown = UISwipeGestureRecognizer ))
swipeDown.direction = Down
.view.addGestureRecognizer(swipeDown)
}
){
if recognizer.direction == Up {
"向上滑动" )
} else Down {
"向下滑动" )
}
.view)
//这个点是滑动的起点
(point.x)
(point.y)
}
}

2,UITapGestureRecognizer:轻点手势(点击)
(1)可以通过numberOfTouchesRequired属性设置触摸点数,比如设置2表示必须两个手指触摸时才会触发
(2)通过numberOfTapsRequired属性设置点击次数,单击设置为1,双击设置为2
(3)如果一个控件既监听了单击事件也监听了双击事件,默认当双击事件触发的时候也同时会触发单击事件。如果想双击时不触发单击,需要通过requireGestureRecognizerToFail进行设置
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//单击监听
tapSingle= UITapGestureRecognizer "tapSingleDid" )
tapSingle.numberOfTapsRequired=1
tapSingle.numberOfTouchesRequired=1
//双击监听
tapDouble= UITapGestureRecognizer "tapDoubleDid:" )
tapDouble.numberOfTapsRequired=2
tapDouble.numberOfTouchesRequired=1
//声明点击事件需要双击事件检测失败后才会执行
tapSingle.requireGestureRecognizerToFail(tapDouble);
.view.addGestureRecognizer(tapSingle)
.view.addGestureRecognizer(tapDouble)
}
tapSingleDid(){
"单击了" )
}
tapDoubleDid(sender: ){
sender.view == .view{
"双击了" )
}
}
}

3,UIPinchGestureRecognizer:捏合手势(两个手指进行放大缩小)
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//设置监听方法为pinchDid方法
pinch= UIPinchGestureRecognizer "pinchDid:" .view.addGestureRecognizer(pinch)
}
pinchDid(recognizer: {
//在监听方法中可以实时获得捏合的比例
(recognizer.scale);
}
}

4,UIRotationGestureRecognizer:旋转手势(两个手指进行旋转)
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rotation= UIRotationGestureRecognizer "rotationDid:" )
.view.addGestureRecognizer(rotation)
}
rotationDid(recognizer: ){
//旋转的弧度转换为角度
(recognizer.rotation*(180/ CGFloat ( M_PI )))
}

5,UIPanGestureRecognizer:拖动手势
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: UIViewController rect: UIView !
viewDidLoad() {
.viewDidLoad()
rect= (frame: CGRectMake (0,100,100))
rect.center= .view.center
rect.backgroundColor= UIColor .redColor()
.view.addSubview(rect)
pan = UIPanGestureRecognizer "panDid:" )
pan.maximumNumberOfTouches=1
rect.addGestureRecognizer(pan)
panDid(recognizer: ){
.view)
//设置矩形的位置
rect.center=point
}

6,UILongPressGestureRecognizer:长按
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import UIKit
{
//长按监听
longPress= UILongPressGestureRecognizer "longPressDid:" )
.view.addGestureRecognizer(longPress)
longPressDid(sender: UILongPressGestureRecognizer ){
sender.state == . Began {
"长按响应开始" )
else "长按响应结束" }
}

原文出自: www.hangge.com 转载请保留原文链接 http://www.hangge.com/blog/cache/detail_546.html

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