相关疑难解决方法(0)

我有iPhone应用程序覆盖相机与自定义视图.我有一个按钮在相机闪光模式之间切换,这是代码

switch ([self.imagePickerController cameraFlashMode]) {
    case UIImagePickerControllerCameraFlashModeAuto:
        [self.imagePickerController setCameraFlashMode:UIImagePickerControllerCameraFlashModeOn];
        return @"On";
        break;

    case UIImagePickerControllerCameraFlashModeOn:
        [self.imagePickerController setCameraFlashMode:UIImagePickerControllerCameraFlashModeOff];
        return @"Off";
        break;

    case UIImagePickerControllerCameraFlashModeOff:
        [self.imagePickerController setCameraFlashMode:UIImagePickerControllerCameraFlashModeAuto];
        return @"Auto";
        break;

    default:
        break;
}

这是我的问题:在iOS 7.0x上工作得很好,但在iOS 7.1中,cameraFlashMode属性返回UIImagePickerControllerCameraFlashModeAuto,无论其真实状态如何.

闪光模式确实发生了变化,但我没有注意到这一点.有线索吗？谢谢