Ios 无法更改UIImagePickerController iphone 4自定义cameraOverlayView的cameraFlashMode

问题：为什么imagePickerController.cameraFlashMode在iphone 4上总是返回0，而在iphone 5上总是返回正确的值

我初始化UIImagePickerController并将cameraFlashMode设置为UIImagePickerController CameraFlashModeOn：

imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePickerController.mediaTypes = [NSArray arrayWithObject:@"public.image"];
imagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
imagePickerController.showsCameraControls = NO;
imagePickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;
[rest of overlay creation...]

然后，当按下“我的自定义覆盖”的“flash”按钮时，将触发此方法：

正如您在下面的屏幕截图中所看到的，cameraFlashMode的值在“变量视图”中是正确的，但使用NSLog和imagePickerController.cameraFlashMode返回0

NSLog(@"current cameraFlashMode=%d", imagePickerController.cameraFlashMode); //returns 0 (iphone 4)

但是，在iphone 5上，可以毫无问题地访问该值：

NSLog(@"current cameraFlashMode=%d", imagePickerController.cameraFlashMode); //returns 1 (iphone 5)

---

我很确定这是一个iOS7.1错误我想你是对的，我在7.1上用两部手机再次测试了，同样的问题。。