ios – 以编程方式在Swift中启动手势识别器？

@H_301_8@

例如,我在检测到长按时向图像添加平移手势识别器,就像这样;@H_301_8@

@H_301_8@

let longPressRecognizer = UILongPressGestureRecognizer(target: self,action: "longPressed:")
myImage.addGestureRecognizer(longPressRecognizer)

func longPressed(sender: UILongPressGestureRecognizer) {

   let mainWidth = UIScreen.mainScreen().bounds.width
   let mainHeight = UIScreen.mainScreen().bounds.height

   let myView: UIView(frame: CGRect(x: 0,y: 0,width: mainWidth,height: mainHeight)

   let gestureRecognizer = UIPanGestureRecognizer(target: self,action: "handlePan:")
   myView.addGestureRecognizer(gestureRecognizer)

   self.view.addSubview(myView)

}

在handlePan()函数中,我能够确定平移的开始和结束时间;@H_301_8@

@H_301_8@

func handlePan(gesture: UIPanGestureRecognizer) {

    if gesture!.state == UIGestureRecognizerState.began {
        print("Started pan")
    }

    if gesture!.state == UIGestureRecognizerState.Ended {
        print("Ended pan")
    }

}

我的问题是,为了检测手势何时开始,用户必须(1)长按图像,(2)松开手指,(3)按住并开始平移.理想情况下,我想让用户(1)长按图像,(2)开始平移.@H_301_8@

为了做到这一点,我想象我需要找出一种方法来“欺骗”事物,使人们相信平移手势已经开始了.@H_301_8@

注意：实际上,比这里提供的更复杂,这就是为什么我需要使用平移手势添加子视图,而不是直接将平移手势添加到图像.@H_301_8@