Objective c IPad摄像头定位问题

我正在实现一个关于摄像头模式功能的应用程序，但应用程序只运行横向，但摄像头在IPad的某些部分打开，剩下的部分是黑色的

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        camPicker.sourceType =  UIImagePickerControllerSourceTypeCamera;
        camPicker.delegate = self;
        camPicker.allowsEditing = NO;
        [self presentModalViewController:camPicker animated:YES];

对于固定为

if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
    return interfaceOrientation == UIInterfaceOrientationLandscapeLeft;

}else
{
    return interfaceOrientation == UIInterfaceOrientationLandscapeRight;

}

将方向设置为：

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}

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在iOS 6.x中不使用

shouldAutorotateToInterfaceOrientation…

方法，直到不能全屏打开摄像头！！！！