iOS8中的UIimagepicker相机开关控制问题

我正在研究UIImagepicker。我发现很奇怪，在iOS8上看不到摄像头切换控件，但当我点击顶部时，摄像头切换。这是iOS8错误还是我的错

但当我在iOS7中检查时，iOS6可以看到摄像头开关控件

UIImagePickerController *picker=[[UIImagePickerController alloc] init];
         picker.delegate=self;
         picker.sourceType = UIImagePickerControllerSourceTypeCamera; 
         picker.showsCameraControls=YES;
         [self presentViewController:picker animated:YES completion:nil];

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试试下面这个。希望它会有用

UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
imgPicker.delegate = self;
imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:imgPicker animated:YES completion:NULL];

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谢谢你的回复。但是，你查过iOS8了吗？