多点触摸与手势识别
//点击事件
var atap = UITapGestureRecognizer(target: self, action: "tapDo:")
self.view.addGestureRecognizer(atap)
atap.numberOfTapsRequired = //单击次数
atap.numberOfTouchesRequired = //手指个数
//拖动事件
var aPan = UIPanGestureRecognizer(target: self, action: "handlenPan:")
self.view.addGestureRecognizer(aPan)
aPan.minimumNumberOfTouches = //最少手指个数
aPan.maximumNumberOfTouches = //最多手指个数
//长按事件
var aLongPress = UILongPressGestureRecognizer(target: self, action: "longPress:")
self.view.addGestureRecognizer(aLongPress)
aLongPress.minimumPressDuration = //需要长按的时间，最小0.5s
//捏合事件
var aPinch = UIPinchGestureRecognizer(target: self, action: "pinchDo:")
self.view.addGestureRecognizer(aPinch)
//旋转事件
var aRotation = UIRotationGestureRecognizer(target: self, action: "rotatePiece:")
self.view.addGestureRecognizer(aRotation)
//轻扫事件--左轻扫
var leftSwipe = UISwipeGestureRecognizer(target: self, action: "leftSwipe:")
self.view.addGestureRecognizer(leftSwipe)
leftSwipe.direction = UISwipeGestureRecognizerDirection.Left
//轻扫事件--右轻扫
var rightSwipe = UISwipeGestureRecognizer(target: self, action: "rightSwipe:")
self.view.addGestureRecognizer(rightSwipe)
rightSwipe.direction = UISwipeGestureRecognizerDirection.Right
//轻扫事件--上轻扫
var upSwipe = UISwipeGestureRecognizer(target: self, action: "upSwipe:")
self.view.addGestureRecognizer(upSwipe)
upSwipe.direction = UISwipeGestureRecognizerDirection.Up
//轻扫事件--下轻扫
var downSwipe = UISwipeGestureRecognizer(target: self, action: "downSwipe:")
self.view.addGestureRecognizer(downSwipe)
downSwipe.direction = UISwipeGestureRecognizerDirection.Down
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
//触摸事件
//手指首次触摸到屏幕
// override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
//2015年5月2后修改,另外：touches --》(touches as NSSet)
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
println("touchesBegan")
//获取touches数量
let numTouches = touches.count
//获取点击屏幕的次数
let tapTouches = (touches as NSSet).anyObject()?.tapCount
//获取事件发生时间
let timestamp = event.timestamp
//获取当前相对于self.view的坐标
let locationPoint = (touches as NSSet).anyObject()?.locationInView(self.view)
//获取上一次相对于self.view的坐标
let previousPoint = (touches as NSSet).anyObject()?.previousLocationInView(self.view)
//允许使用手势
self.view.userInteractionEnabled = true
//支持多点触摸
self.view.multipleTouchEnabled = true
println("\(tapTouches)")
//判断如果有两个触摸点
{
//获取触摸集合
let twoTouches = (touches as NSSet).allObjects
//获取触摸数组
let first:UITouch = twoTouches[] as! UITouch //第1个触摸点
let second:UITouch = twoTouches[]as! UITouch //第2个触摸点
//获取第1个点相对于self.view的坐标
let firstPoint:CGPoint = first.locationInView(self.view)
//获取第1个点相对于self.view的坐标
let secondPoint:CGPoint = second.locationInView(self.view)
//计算两点之间的距离
let deltaX = secondPoint.x - firstPoint.x;
let deltaY = secondPoint.y - firstPoint.y;
let initialDistance = sqrt(deltaX*deltaX + deltaY*deltaY )
println("两点间距离是：\(initialDistance)")
}
}
//手指在移动
// override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
//2015年5月2后修改
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
println("touchesMoved")
}
//触摸结束
// override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
//2015年5月2后修改
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
println("touchesEnded")
}
//触摸意外终止
//模拟器演示：鼠标拖动的同时，按键盘command+shift+h 相当于点击手机home键，退出应用，触发touchesCancelled事件，在打电话、等情况下也会触发
// override func touchesCancelled(touches: NSSet!, withEvent event: UIEvent!) {
//2015年5月2后修改
override func touchesCancelled(touches: Set<NSObject>!, withEvent event: UIEvent!) {
println("touchesCancelled")
}
//手势
//点击事件
func tapDo(sender:UITapGestureRecognizer)
{
println("点击事件")
}
//拖动事件
func handlenPan(sender:UIPanGestureRecognizer)
{
println("拖动事件")
if sender.state == .Began
{
//拖动开始
}
else if sender.state == .Changed
{
//拖动过程
}
else if sender.state == .Ended
{
//拖动结束
}
}
//长摁事件
func longPress(sender:UILongPressGestureRecognizer)
{
println("长摁事件")
}
//捏合事件
func pinchDo(sender:UIPinchGestureRecognizer)
{
println("捏合")
}
//旋转事件
func rotatePiece(sender:UIRotationGestureRecognizer)
{
println("旋转")
}
//轻扫事件--左轻扫
func leftSwipe(sender:UISwipeGestureRecognizer)
{
println("左轻扫")
}
//轻扫事件--右轻扫
func rightSwipe(sender:UISwipeGestureRecognizer)
{
println("右轻扫")
}
//轻扫事件--上轻扫
func upSwipe(sender:UISwipeGestureRecognizer)
{
println("上轻扫")
}
//轻扫事件--下轻扫
func downSwipe(sender:UISwipeGestureRecognizer)
{
println("下轻扫")
}