ios中如何固定单个viewController的方向？

app需要支持两个屏幕方向，其中一些controller是固定竖屏，一些是固定横屏，我试了下stackoverflow中的这种方法，http://stackoverflow.com/questions/12520030/how-to-force-a-uiviewcontroller-to-portait-orientation-in-ios-6 但还是不管用啊，还有那个shouldAutorotateToInterfaceOrientation方法出设置断点也没反应，太奇怪了

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后来通过覆写VC的这几个实现解决了

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

- (NSUInteger)supportedInterfaceOrientations
{
//    return UIInterfaceOrientationMaskLandscapeLeft;
    return UIInterfaceOrientationMaskLandscapeRight;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationLandscapeRight;
//    return UIInterfaceOrientationPortrait;
}