Manually set interface orientation

Is there any easy way to manually set t开发者_运维技巧he orientation of an interface? I need to set the interface to portrait even though the device orientation might be in landscape during loading. Kinda want to stay away from CGAffineTransforms.

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One method I know that works for me (and is a bit of a hack and can display one orientation before changing to the orientation you want) is:

- (void)viewDidAppear:(BOOL)animated 
{
    [super viewDidAppear:animated];

    UIApplication* application = [UIApplication sharedApplication];

    if (application.statusBarOrientation != UIInterfaceOrientationPortrait)
    {
        UIViewController *c = [[UIViewController alloc]init];
        [self presentModalViewController:c animated:NO];
        [self dismissModalViewControllerAnimated:NO];
        [c release];
    }
}

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First, set your app and views to only support portrait, then use this category method taken from my refactoring library, es_ios_utils:

@interface UIViewController(ESUtils)
    // Forces without using a private api.
    -(void)forcePortrait;
@end

@implementation UIViewController(ESUtils)

-(void)forcePortrait
{
    //force portrait orientation without private methods.
    UIViewController *c = [[UIViewController alloc] init];
    [self presentModalViewController:c animated:NO];
    [self dismissModalViewControllerAnimated:NO];
    [c release];
}

@end

The view, dismissed before the frame completes, won't be displayed.

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override this to control the orientation until loading...

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation