swift中的手势

手势操作主要包括如下几类

手势	属性	说明
点击 UITapGestureRecognizer	numberOfTapsrequired：点击的次数；numberOfTouchesrequired：点击时有手指数量	设置属性 numberOfTapsrequired 可以实现单击，或双击的效果
滑动 UISwipeGestureRecognizer	direction：滑动方向	direction 滑动方向分为上Up、下Down、左Left、右Right
拖动 UIPanGestureRecognizer		在拖动过程中，通过方法 translationInView 获取拖动时的位移
长按 UILongPressGestureRecognizer	minimumPressDuration：长按最少时间
旋转 UIRotationGestureRecognizer
缩放 UIPinchGestureRecognizer

注意：手势效果在实施过程中，存在几种状态：
* Began
* Ended
* Cancelled
* Failed
* Possible

代码示例

// 点击
let label = UILabel(frame: CGRectMake(10.0,10.0,(self.view.frame.size.width - 10.0 * 2),60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-单指单击手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let tapRecognizer = UITapGestureRecognizer(target: self,action: Selector("tapClick:"))
tapRecognizer.numberOfTapsrequired = 1
tapRecognizer.numberOfTouchesrequired = 1
label.userInteractionEnabled = true
label.addGestureRecognizer(tapRecognizer)

// 手势响应方法
func tapClick(recognizer:UITapGestureRecognizer)
{
        let label:UILabel = recognizer.view as! UILabel
        label.textColor = UIColor.redColor()
}

// 滑动
let label = UILabel(frame: CGRectMake(10.0,60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-左滑手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let swipeLeftRecognizer = UISwipeGestureRecognizer(target: self,action: Selector("swipeLeftClick:"))
swipeLeftRecognizer.direction = .Left
swipeLeftRecognizer.numberOfTouchesrequired = 1
label.userInteractionEnabled = true
label.addGestureRecognizer(swipeLeftRecognizer)

// 手势响应方法
func swipeLeftClick(recognizer:UISwipeGestureRecognizer)
{
        let label = recognizer.view
        label!.backgroundColor = UIColor.orangeColor()
}

// 拖动
let label = UILabel(frame: CGRectMake(10.0,100.0,100.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-拖动手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let panRecognizer = UIPanGestureRecognizer(target: self,action: Selector("panClick:"))
label.userInteractionEnabled = true
label.addGestureRecognizer(panRecognizer)

var pointValue:CGPoint! = CGPointZero // 移动
// 手势响应方法
func panClick(recognizer:UIPanGestureRecognizer)
{
        let label:UILabel = recognizer.view as! UILabel

        let point = recognizer.translationInView(label)
        print("pan point = \(point)")

        // 移动
        label.transform = CGAffineTransformMakeTranslation(point.x + self.pointValue.x,point.y + self.pointValue.y)

        if recognizer.state == .Began
        {
            label.backgroundColor = UIColor.yellowColor()
            self.view.bringSubviewToFront(label)
        }
        else if recognizer.state == .Ended
        {
            label.backgroundColor = UIColor.lightGrayColor()

            self.pointValue.x += point.x
            self.pointValue.y += point.y
        }
}

// 缩放
let label = UILabel(frame: CGRectMake(10.0,200.0,200.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-捏合手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let pinchRecognizer = UIPinchGestureRecognizer(target: self,action: Selector("pinchClick:"))
label.userInteractionEnabled = true
label.addGestureRecognizer(pinchRecognizer)

// 手势响应方法
var scaleValue:CGFloat! = 1.0  // 缩放
func pinchClick(recognizer:UIPinchGestureRecognizer)
{
        let label:UILabel = recognizer.view as! UILabel

        let scale = recognizer.scale;
        if scale > 1.0
        {
            // 放大
            label.transform = CGAffineTransformMakeScale(self.scaleValue + scale - 1.0,self.scaleValue + scale - 1.0)
        }
        else
        {
            // 缩小
            label.transform = CGAffineTransformMakeScale(self.scaleValue * scale,self.scaleValue * scale)
        }

        if recognizer.state == .Began
        {
            label.backgroundColor = UIColor.greenColor()
            self.view.bringSubviewToFront(label)
        }
        else if recognizer.state == .Ended
        {
            label.backgroundColor = UIColor.lightGrayColor()

            if scale > 1.0
            {
                self.scaleValue = self.scaleValue + scale - 1.0;
            }
            else
            {
                self.scaleValue = self.scaleValue * scale
            }
        }
}

// 旋转
let label = UILabel(frame: CGRectMake(10.0,200.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-旋转手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let rotationRecognizer = UIRotationGestureRecognizer(target: self,action: Selector("ratotionClick:"))
label.userInteractionEnabled = true
label.addGestureRecognizer(rotationRecognizer)

var rotationValue:CGFloat! = 1.0 // 旋转
// 手势响应方法
func ratotionClick(recognizer:UIRotationGestureRecognizer)
{
        let label:UILabel = recognizer.view as! UILabel

        let rotation = recognizer.rotation
        label.transform = CGAffineTransformMakeRotation(rotation + self.rotationValue)

        if recognizer.state == .Began
        {
            label.backgroundColor = UIColor.greenColor()
            self.view.bringSubviewToFront(label)
        }
        else if recognizer.state == .Ended
        {
            label.backgroundColor = UIColor.lightGrayColor()

            self.rotationValue = self.rotationValue + rotation
        }
}

// 长按
let label = UILabel(frame: CGRectMake(10.0,60.0))
self.view.addSubview(label)
label.backgroundColor = UIColor.lightGrayColor()
label.text = "手势操作-长按手势";
label.adjustsFontSizeToFitWidth = true
label.textAlignment = .Center;
// 添加手势
let pressRecognizer = UILongPressGestureRecognizer(target: self,action: Selector("pressClick:"))
        pressRecognizer.minimumPressDuration = 3.0
        label.userInteractionEnabled = true
        label.addGestureRecognizer(pressRecognizer)

// 手势响应方法
func pressClick(recognizer:UILongPressGestureRecognizer)
{
        let label:UILabel = recognizer.view as! UILabel

        if recognizer.state == .Began
        {
            let alertView = UIAlertView(title: nil,message: "长按响应",delegate: nil,cancelButtonTitle: "知道了")
            alertView.show()

            label.backgroundColor = UIColor.orangeColor()
            self.view.bringSubviewToFront(label)
        }
        else if recognizer.state == .Ended
        {
            label.backgroundColor = UIColor.lightGrayColor()
        }
}

swift中的手势

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