Question

我有一些带有Pan和Tap手势识别器的图片效果很好。

我也尝试添加捏合手势，但代表甚至不会解雇：

 func addPinchTo(image:UIImageView)
    {
        let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector( self.Pscale(gesture:) ))
        let rotationGesture = UIRotationGestureRecognizer(target: self, action: #selector( self.ProtateArt(gesture:) ))
        image.addGestureRecognizer(pinchGesture)
        image.addGestureRecognizer(rotationGesture)
        image.isUserInteractionEnabled =  true


    }


func Pscale(gesture: UIPinchGestureRecognizer) {

        print("D") //not print
   }

  func ProtateArt(gesture: UIRotationGestureRecognizer) {

        print("aD") //not print
}

Answer 1

func addPinchTo(image:UIImageView) -> UIImageView
    {
        let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector( self.Pscale(gesture:) ))
        let rotationGesture = UIRotationGestureRecognizer(target: self, action: #selector( self.ProtateArt(gesture:) ))
        image.addGestureRecognizer(pinchGesture)
        image.addGestureRecognizer(rotationGesture)
        image.isUserInteractionEnabled =  true

        return image
    }


func Pscale(gesture: UIPinchGestureRecognizer) {

        print("D") //not print
   }

func ProtateArt(gesture: UIRotationGestureRecognizer) {

        print("aD") //not print
}

或感谢@Leo Dabus，使用@objc方法也可以。

@objc func pinch(gesture: UIPinchGestureRecognizer) {
    print("hit from pinch function")
}

@objc func rotation(gesture: UIRotationGestureRecognizer) {
   print("hit from rotation function")
}

并使其工作，您的代码应该看起来像这样

    func addPinchTo(image: UIImageView) {
    let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(pinch))
    let rotationGesture = UIRotationGestureRecognizer(target: self, action: #selector(rotation))
    image.addGestureRecognizer(pinchGesture)
    image.addGestureRecognizer(rotationGesture)
    image.isUserInteractionEnabled =  true
}

试试这个，它应该可行

祝你好运！

Answer 2

问题是你可能从未调用过将手势识别器添加到图像视图的方法。如果您使用Swift 4进行编码，请确保将@objc添加到您的方法中。顺便说一句，Swift惯例是用小写字母命名你的方法：

@IBOutlet weak var imageView: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()
    addPinchTo(image: imageView)
}

func addPinchTo(image: UIImageView) {
    let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(pinch))
    let rotationGesture = UIRotationGestureRecognizer(target: self, action: #selector(rotation))
    image.addGestureRecognizer(pinchGesture)
    image.addGestureRecognizer(rotationGesture)
    image.isUserInteractionEnabled =  true
}

@objc func pinch(gesture: UIPinchGestureRecognizer) {
    print(#function)
}

@objc func rotation(gesture: UIRotationGestureRecognizer) {
    print(#function)
}

Answer 3

代码工作得很好，只是没有在Mac上，即使你的触控板让你无法在Mac上进行操作，只能在iPhone上使用。

Answer 4

如果您有多个手势识别器，则可以实现UIGestureRecognizerDelegate并为此方法返回true

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return Bool
}

此方法询问委托人是否应使用两个手势识别器允许同时识别手势。

例如：

    let gifImageView = UIImageView()
    gifImageView.contentMode = .scaleToFill
    gifImageView.layer.cornerRadius = 5
    gifImageView.layer.masksToBounds = true
    gifImageView.translatesAutoresizingMaskIntoConstraints = false
    gifImageView.isUserInteractionEnabled = true

    NSLayoutConstraint.activate([
        gifImageView.topAnchor.constraint(equalTo: navigationBarView.bottomAnchor, constant: 16),
        gifImageView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
        gifImageView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
        gifImageView.bottomAnchor.constraint(equalTo: collectionView.topAnchor, constant: -16)
    ])

    let rotationGestureRecognizer = UIRotationGestureRecognizer(target: self, action: #selector(handleRotate(_:)))
    rotationGestureRecognizer.delegate = self
    gifImageView.addGestureRecognizer(rotationGestureRecognizer)

    let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
    panGestureRecognizer.delegate = self
    gifImageView.addGestureRecognizer(panGestureRecognizer)

    let pincGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(_:)))
    pincGestureRecognizer.delegate = self
    gifImageView.addGestureRecognizer(pincGestureRecognizer)
    view.addSubview(gifImageView)

还有您的处理功能：

 @objc func handleRotate(_ gestureRecognizer : UIRotationGestureRecognizer) {

    if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
        gifImageView.transform = gifImageView.transform.rotated(by: gestureRecognizer.rotation)
        gestureRecognizer.rotation = 0
    }
}

@objc func handlePan(_ gestureRecognizer: UIPanGestureRecognizer) {

    if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
        let translation = gestureRecognizer.translation(in: self.view)
        gifImageView.center = CGPoint(x: gifImageView.center.x + translation.x, y: gifImageView.center.y + translation.y)
        gestureRecognizer.setTranslation(CGPoint.zero, in: self.view)
    }
}

@objc func handlePinch(_ gestureRecognizer: UIPinchGestureRecognizer) {

    if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
        gifImageView.transform = gifImageView.transform.scaledBy(x: gestureRecognizer.scale, y: gestureRecognizer.scale)
        gestureRecognizer.scale = 1.0
    }
}

//Finally implement gesture recognizer delegate method 

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

捏手势无效

4 个答案: