IOS学习之手势检测

迷南。 2022-07-26 12:18 231阅读 0赞

1、概述：

UISwipeGestuRecognizer: 滑动（快速滑动）

UITapGestureRecognizer: 点击（轻点）

UIPinchGestureRecognizer: 捏合

UIRotationGestureRecognizer: 旋转

UIPanGestureRecognizer: 拖动（移动速率较慢）

UILogPressGestureRecognizer: 长按

2、工具

Xcode：7.2，语言：Swift

3、滑动 （UISwipeGestureRecognizer）

let swipe = UISwipeGestureRecognizer(target: self, action: "Swipe");
            /// 定义滑动方向
            swipe.direction = UISwipeGestureRecognizerDirection.Down;
            
            self.view.addGestureRecognizer(swipe);

这里的代码很简单。初始化时，设置了target 和 action。 同时， 调用View的addGestureRecognizer方法，表示添加一个手势检测。action的方法如下：

func Swipe()
        {
            print("swipe");
        }

4、 轻点、捏合、旋转

/*  轻点 */
            let tapSingle = UITapGestureRecognizer(target: self, action: "tapSingle");
            
            /// 设置触摸点数
            tapSingle.numberOfTapsRequired = 1;
            /// 设置点击次数
            tapSingle.numberOfTouchesRequired = 1;
            let tapDouble = UITapGestureRecognizer(target: self, action: "tapDouble");
            tapDouble.numberOfTapsRequired = 2;
            tapDouble.numberOfTouchesRequired = 1;
            
            /// 双击事件不触发单击事件
            tapSingle.requireGestureRecognizerToFail(tapDouble);
            
            /// 添加
            view.addGestureRecognizer(tapDouble);
            view.addGestureRecognizer(tapSingle);
            
            
            /*  捏合  */
            let pinch = UIPinchGestureRecognizer(target: self, action: "pinchTouch:");
            view.addGestureRecognizer(pinch);
            
            /*  旋转手势  */
            let retation = UIRotationGestureRecognizer(target: self, action: "retation:");
            view.addGestureRecognizer(retation);

下面是action代码：

func retation(recognizer:UIRotationGestureRecognizer)
        {
            print(recognizer.rotation * (180 / CGFloat(M_PI)));
        }
        
        func pinchTouch(recognizer: UIPinchGestureRecognizer)
        {
            print(recognizer.scale);
        }
        
        func tapDouble()
        {
            print("Double");
        }
        
        func tapSingle()
        {
            print("single");
        }

5、拖动

/*  拖动手势  */
            rect = UIView(frame:CGRectMake(0, 0, 100, 100));
            rect.center = view.center;
            rect.backgroundColor = UIColor.greenColor();
            view.addSubview(rect);
            
            let pan = UIPanGestureRecognizer(target: self, action: "panDid:");
            pan.maximumNumberOfTouches = 1;
            rect.addGestureRecognizer(pan);

action代码：

func panDid(recognizer:UIPanGestureRecognizer)
        {
            let point = recognizer.locationInView(self.view);
            rect.center = point;
        }

运行结果（可以拖动有色块移动） ：  
  
![Center][]

[Center]: /images/20220724/eb6f8a6a811c4d78a4fa1fcb91a4f9cf.png