8.24 Responder

创建两个类，First, Second.写好touches的实现方法

Paste_Image.png

import UIKit

class SecondView: UIView {
    
    override func touchesBegan(touches: Set, withEvent event: UIEvent?) {
        //UIView的实现会自动往下层传递
        
        print("second begin")
        
        super.touchesBegan(touches, withEvent: event)
    }
    
    override func touchesMoved(touches: Set, withEvent event: UIEvent?) {
        
        print("second moved")
        
        super.touchesMoved(touches, withEvent: event)
    }
    
    override func touchesEnded(touches: Set, withEvent event: UIEvent?) {
        
        print("second ended")
        
        super.touchesEnded(touches, withEvent: event)
    }
    
    override func touchesCancelled(touches: Set?, withEvent event: UIEvent?) {
        
        print("second cancel")
        
        super.touchesCancelled(touches, withEvent: event)
    }
}

回到ViewController

import UIKit

class ViewController: UIViewController {
    var rotation: CGFloat = 0
    var scale: CGFloat = 1

    override func viewDidLoad() {
        super.viewDidLoad()
        
        //1. 视图默认可以接收触摸事件
        let firstView = FirstView(frame: CGRect(x: 100, y: 100, width: 300, height: 300))
        //当父视图不能交互时，所有子视图都不能交互
        //UIImageView: 默认为false，不能交互，如果上面放一个按钮，点击Button是没反应的，要更改下面这条属性为true才可以交互
//        firstView.userInteractionEnabled = true
        firstView.backgroundColor = UIColor.redColor()
        self.view.addSubview(firstView)
        
        //2. 视图结构不能改变事件传递顺序
        let secondView = SecondView(frame: CGRect(x: 0, y: 0, width: 150, height: 150))
        //用户是否可以交互
        //UIView默认为true
//        secondView.userInteractionEnabled = false
        secondView.backgroundColor = UIColor.greenColor()
//        self.view.addSubview(secondView)
        firstView.addSubview(secondView)
        
        let rotate = UIRotationGestureRecognizer(target: self, action: #selector(didRotate(_:)))
        firstView.addGestureRecognizer(rotate)
        
        let pinch = UIPinchGestureRecognizer(target: self, action: #selector(didPinch(_:)))
        firstView.addGestureRecognizer(pinch)
    }
    
    func didRotate(sender: UIRotationGestureRecognizer) {
        let firstView = sender.view!
//        firstView?.transform = CGAffineTransformMakeRotation(sender.rotation)
        
        firstView.transform = CGAffineTransformRotate(firstView.transform, sender.rotation - rotation)
        rotation = sender.rotation
        
        print(sender.rotation)
        
        if sender.state == .Ended {
            rotation = 0
        }
        
        //手势每次都是从0开始
        print("rotate: ", sender.rotation)
    }
    
    func didPinch(sender: UIPinchGestureRecognizer) {
        let firstView = sender.view!
        
        //??????
        firstView.transform = CGAffineTransformScale(firstView.transform, sender.scale - scale + 1 , sender.scale - scale + 1)
        
        scale = sender.scale
        
        if sender.state == .Ended {
            scale = 1
        }
        
        print("scale: ", sender.scale)
    }
    
    //设置touches开始，移动，结束，取消事件
    override func touchesBegan(touches: Set, withEvent event: UIEvent?) {
        print("ViewController begin")
    }
    
    override func touchesMoved(touches: Set, withEvent event: UIEvent?) {
        print("ViewController moved")
    }
    
    override func touchesEnded(touches: Set, withEvent event: UIEvent?) {
        print("ViewController ended")
    }
    
    override func touchesCancelled(touches: Set?, withEvent event: UIEvent?) {
        print("ViewController cancel")
    }
}