ios - 如何在 ImagePickerController() 的覆盖 View 上识别 TapGesture ？

Question

我正在尝试将 UITapGestureRecogniser 添加到我为 UIImagePickerController 创建的覆盖 View 中。但是没有检测到任何点击。以下是我的代码:

 //Setting up image picker controller
 let imagePicker = UIImagePickerController()
 imagePicker.delegate = self
 imagePicker.sourceType = .camera
 imagePicker.showsCameraControls = false

 //Setting up the tap gesture
 let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.cropImageAroundTap(sender:)))
 tapGesture.delegate = self

 //Setting up overlay view
 let overlayView = UIView.init(frame: self.view.frame)
 overlayView.isOpaque = false
 overlayView.isUserInteractionEnabled = true
 overlayView.backgroundColor = UIColor.clear
 overlayView.addGestureRecognizer(tapGesture)

 imagePicker.cameraOverlayView = overlayView
 self.present(imagePicker, animated: true, completion: nil )

如果我将手势识别器添加到 imagePicker.view，则相机控件所在的部分会检测到点击，但不会检测到预览窗口。以下是我用于检测点击的函数:

func cropImageAroundTap(sender: UITapGestureRecognizer) {

     if sender.state == .ended {

       NSLog("hello")
     }

}

有没有办法检测预览窗口上的点击？

Answer 1

我能够在图像选择器的预览 View 中检测点击手势，而不是设置:

 imagePicker.cameraOverlayView = overlayView

我将overlayView添加为imagePicker的 subview

 imagePicker.view.addSubview(overlayView)