Swift 3 如何强制开启后置摄像头闪光灯？

Question

我试图强制打开 imagePicker 的闪光灯，但是当我运行以下代码时，它默认关闭。在 Swift 3 中是否还需要执行其他操作以强制打开闪光灯？

  let imagePicker = UIImagePickerController()
  imagePicker.delegate = self
  imagePicker.sourceType = UIImagePickerControllerSourceType.camera;
  imagePicker.allowsEditing = false
  imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.on
  imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.rear;
  self.present(imagePicker, animated: true, completion: nil)

之前有人在这里问过旧版本 Swift 的问题：

但是，为了让它在 Swift 3.

中工作，我似乎缺少一些细微之处

Answer 1

在完成闭包中设置相机闪光灯模式如下：

  self.present(imagePicker, animated: true)
  {
      imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.on
  }

完整出处如下：

  let imagePicker = UIImagePickerController()
  imagePicker.delegate = self
  imagePicker.sourceType = UIImagePickerControllerSourceType.camera;
  imagePicker.allowsEditing = false
  imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.rear;

  self.present(imagePicker, animated: true)
  {
      imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.on
  }

已验证这适用于 Swift 3，但不确定它是否对旧版本有帮助。

Swift 3 如何强制开启后置摄像头闪光灯？

How can the rear camera flash be forced to on in Swift 3?

camera

uiimagepickercontroller

ios

swift