无法使UIPinchGestureRecognizer工作

Question

我似乎无法以编程方式使其正常工作。 我有一个UIImageView，我想使其成为Draggable和Pinchable。 可拖动部分的所有内容均正常运行 ，但另一方面，收紧效果似乎无效。

我的自定义UIImageView类将UIImageView子类化并实现UIGestureRecognizerDelegate

在我的init函数中，我具有以下内容：

required init?(coder aDecoder: NSCoder) {

    super.init(coder: aDecoder)

    self.initializeGestures()

}


override init(image: UIImage?) {

    super.init(image: image)

    self.initializeGestures()

}

func initializeGestures() {

    self.userInteractionEnabled = true
    self.multipleTouchEnabled = true

    dragGesture = UIPanGestureRecognizer(target: self, action: "handlePan:")
    zoomGesture = UIPinchGestureRecognizer(target: self, action: "handlePinch:")

    self.addGestureRecognizer(dragGesture)
    self.addGestureRecognizer(zoomGesture)

}

接下来是以下代码行：

func handlePan(recognizer: UIPanGestureRecognizer!) {

    Scripts.log("PAN >>> DRAG ACTIVATED")
}


func handlePinch(recognizer: UIPinchGestureRecognizer) {

    Scripts.log("PINCH >>> ZOOM ACTIVATED")

    recognizer.view?.transform = CGAffineTransformScale((recognizer.view?.transform)!, recognizer.scale, recognizer.scale)
    recognizer.scale = 1

}

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {

    return true

}