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()
var swipe = UISwipeGestureRecognizer(target:self, action:Selector("swipe:"))
swipe.direction = UISwipeGestureRecognizerDirection.Up
self.view.addGestureRecognizer(swipe)
}
func swipe(recognizer:UISwipeGestureRecognizer){
println("swipe ok")
var point=recognizer.locationInView(self.view)
//这个点是滑动的起点
println(point.x)
println(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swipe.direction = UISwipeGestureRecognizerDirection.Up
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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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class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
var swipeUp = UISwipeGestureRecognizer(target:self, action:Selector("swipe:"))
swipeUp.direction = UISwipeGestureRecognizerDirection.Up
self.view.addGestureRecognizer(swipeUp)
var swipeDown = UISwipeGestureRecognizer(target:self, action:Selector("swipe:"))
swipeDown.direction = UISwipeGestureRecognizerDirection.Down
self.view.addGestureRecognizer(swipeDown)
}
func swipe(recognizer:UISwipeGestureRecognizer){
if recognizer.direction == UISwipeGestureRecognizerDirection.Up{
println("向上滑动")
}else if recognizer.direction == UISwipeGestureRecognizerDirection.Down{
println("向下滑动")
}
var point=recognizer.locationInView(self.view)
//这个点是滑动的起点
println(point.x)
println(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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class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//单击监听
var tapSingle=UITapGestureRecognizer(target:self,action:"tapSingleDid")
tapSingle.numberOfTapsRequired=1
tapSingle.numberOfTouchesRequired=1
//双击监听
var tapDouble=UITapGestureRecognizer(target:self,action:"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);
self.view.addGestureRecognizer(tapSingle)
self.view.addGestureRecognizer(tapDouble)
}
func tapSingleDid(){
println("单击了")
}
func tapDoubleDid(sender:UITapGestureRecognizer){
if sender.view == self.view{
println("双击了")
}
}
} |
3，UIPinchGestureRecognizer：捏合手势（两个手指进行放大缩小）
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class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//设置监听方法为pinchDid方法
var pinch=UIPinchGestureRecognizer(target:self,action:"pinchDid:")
self.view.addGestureRecognizer(pinch)
}
func pinchDid(recognizer:UIPinchGestureRecognizer)
{
//在监听方法中可以实时获得捏合的比例
println(recognizer.scale);
}
} |
4，UIRotationGestureRecognizer：旋转手势（两个手指进行旋转）
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class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
var rotation=UIRotationGestureRecognizer(target:self,action:"rotationDid:")
self.view.addGestureRecognizer(rotation)
}
func rotationDid(recognizer:UIRotationGestureRecognizer){
//旋转的弧度转换为角度
println(recognizer.rotation*(180/CGFloat(M_PI)))
}
} |
5，UIPanGestureRecognizer：拖动手势
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class ViewController: UIViewController {
var rect:UIView!
override func viewDidLoad() {
super.viewDidLoad()
rect=UIView(frame:CGRectMake(0, 0, 100, 100))
rect.center=self.view.center
rect.backgroundColor=UIColor.redColor()
self.view.addSubview(rect)
var pan = UIPanGestureRecognizer(target:self,action:"panDid:")
pan.maximumNumberOfTouches=1
rect.addGestureRecognizer(pan)
}
func panDid(recognizer:UISwipeGestureRecognizer){
var point=recognizer.locationInView(self.view)
//设置矩形的位置
rect.center=point
}
} |
6，UILongPressGestureRecognizer：长按