如何实现UIGestureRecognizerDelegate？

Question

这是我的代码，但它不工作。

class ViewController: UIViewController, UIGestureRecognizerDelegate { 

    override func viewDidLoad() { 
     super.viewDidLoad() 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
    } 

    @IBAction func handlePan(recognizer:UIPanGestureRecognizer){ 
     recognizer.delegate = self 

     let translation = recognizer.translation(in: self.view) 

     if let view = recognizer.view{ 
      view.center = CGPoint(x:view.center.x + translation.x, 
            y:view.center.y + translation.y) 
     } 
    recognizer.setTranslation(CGPoint.zero, in: self.view) 

     if recognizer.state == UIGestureRecognizerState.ended{ 
      let velocity = recognizer.velocity(in: self.view) 
      let magnitude = sqrt((velocity.x * velocity.x)+(velocity.y * velocity.y)) 
      let slideMultiplier = magnitude/600 

      let slideFactor = 0.1 * slideMultiplier 

      var finalPoint = CGPoint(x:recognizer.view!.center.x + (velocity.x * slideFactor), 
            y:recognizer.view!.center.y + (velocity.y * slideFactor)) 

      finalPoint.x = min(max(finalPoint.x, 0), self.view.bounds.size.width) 
      finalPoint.y = min(max(finalPoint.y, 0), self.view.bounds.size.height) 

      UIView.animate(withDuration: Double(slideFactor * 2), 
          delay: 0, 
          options: UIViewAnimationOptions.curveEaseOut, 
          animations: {recognizer.view!.center = finalPoint}, 
          completion: nil) 
     } 

    } 

    @IBAction func handlePinch(recognizer : UIPinchGestureRecognizer){ 
     recognizer.delegate = self 
     if let view = recognizer.view { 
      let pinch = recognizer.scale 
      view.transform = CGAffineTransform.init(scaleX: pinch, y: pinch) 
     } 
    } 

    @IBAction func handleRotate(recognizer : UIRotationGestureRecognizer){ 
     recognizer.delegate = self 
     if let view = recognizer.view{ 
      let rotation = recognizer.rotation 
       view.transform = CGAffineTransform.init(rotationAngle: rotation) 
     } 
    } 

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

我试着在我的iPhone上，但是当我尝试捏和旋转在同一时间它不起作用。

Answer 1

嗯，我发现如何做到这一点：

@IBAction func handlePinch(recognizer : UIPinchGestureRecognizer){ 
    if let view = recognizer.view { 
     view.transform = view.transform.scaledBy(x: recognizer.scale, y: recognizer.scale) 
     recognizer.scale = 1 
    } 
} 

@IBAction func handleRotate(recognizer : UIRotationGestureRecognizer){ 
    if let view = recognizer.view{ 
      view.transform = view.transform.rotated(by: recognizer.rotation) 
     recognizer.rotation = 0 
    } 
}