同时检测捏合和旋转手势

Question

我已经成功地使用UIGestureRecognizers实现了手势，允许用户放大和旋转视图。然而，用户不能同时执行两个手势（即同时旋转和缩放）。我该如何解决这个问题？以下是我添加手势的方法：

var rotateRecognizer = UIRotationGestureRecognizer(target: self, action: "handleRotate:")
var pinchRecognizer = UIPinchGestureRecognizer(target: self, action: "handlePinch:")

testV.addGestureRecognizer(rotateRecognizer)
testV.addGestureRecognizer(pinchRecognizer)

- SpaceShroomies

---

https://dev59.com/-2sz5IYBdhLWcg3wHUIU - Bannings

Answer 1

在Swift 3中，委托方法的名称为：

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

也需要为手势设置委托：

rotateRecognizer.delegate = self
pinchRecognizer.delegate = self

- Bohdan Savych

Answer 2

我刚刚添加了这个代码，它可以正常工作：

func gestureRecognizer(UIGestureRecognizer,
        shouldRecognizeSimultaneouslyWithGestureRecognizer:UIGestureRecognizer) -> Bool {
            return true
    }

- SpaceShroomies

Answer 3

让 rotateGesture = UIRotationGestureRecognizer(target: self, action: #selector(self.rotateGesture))

self.imageView.addGestureRecognizer(rotateGesture)

让 pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(self.pinchGesture)) self.imageView.addGestureRecognizer(pinchGesture)

func rotateGesture(sender: UIRotationGestureRecognizer){
    sender.view?.transform = (sender.view?.transform)!.rotated(by: sender.rotation)
    sender.rotation = 0
    print("rotate gesture")
}
func pinchGesture(sender: UIPinchGestureRecognizer){
    sender.view?.transform = (sender.view?.transform)!.scaledBy(x: sender.scale, y: sender.scale)
    sender.scale = 1
    print("pinch gesture")
}

- Sai kumar Reddy