同时检测捏合和旋转手势答案

【问题标题】：Detacting Pinch and Rotation gestures simultaneously同时检测捏合和旋转手势
【发布时间】：2015-06-10 07:56:08
【问题描述】：

我已经成功实现了允许用户使用 UIGuestureRecognizers 放大和旋转视图的手势。但是，用户不能同时做两个手势（即同时旋转和缩放）。我该怎么做呢？下面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)

【问题讨论】：

stackoverflow.com/questions/8108768/…

标签： swift uigesturerecognizer

【解决方案1】：

在 swift 3 中，委托方法名称是：

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

您还需要为手势设置委托：

rotateRecognizer.delegate = self
pinchRecognizer.delegate = self

【讨论】：

【解决方案2】：

刚刚添加了这个，它就可以工作了：

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

【讨论】：

【解决方案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")
}

【讨论】：