如何在swift 3.0中拖动和缩放UIView中的UIImageView？

yourImageView.isUserInteractionEnabled = true

let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(_:)))
yourImageView.addGestureRecognizer(panGesture)

let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(handlePinchGesture(_:)))
yourImageView.addGestureRecognizer(pinchGesture)

@objc func handlePanGesture(_ gesture: UIPanGestureRecognizer) {
    let translation = gesture.translation(in: self.view)
    gesture.view?.center = CGPoint(x: gesture.view!.center.x + translation.x, y: gesture.view!.center.y + translation.y)
    gesture.setTranslation(CGPoint.zero, in: self.view)
}

@objc func handlePinchGesture(_ gesture: UIPinchGestureRecognizer) {
    if gesture.state == .changed {
        gesture.view?.transform = (gesture.view?.transform.scaledBy(x: gesture.scale, y: gesture.scale))!
        gesture.scale = 1.0
    }
}