iPad Modal View rotates parentViewController View

When the application is in landscape mode (which I plan to force), displaying a modal view causes the parent view to rotate to portrait mode. If I set the return value of shouldAutoRotateToInterfaceOrientation to NO, the parent does not rotate, howe开发者_如何学Gover the modal then slides in from the side and displays sideways. Below is the code that reveals the modal.

- (IBAction)loadExistingGame:(id)sender {

SavedGamesTableViewController *savedGames = [[SavedGamesTableViewController alloc] initWithStyle:UITableViewStyleGrouped];
savedGames.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:savedGames animated:YES];

[savedGames release];

}

As per request here is the contents of the shouldAutoRotate method of the SavedGamesTableViewController

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Override to allow orientations other than the default portrait orientation.
return YES;

}

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Ok I figured out what needed to be done to fix it. The plist file that contains a list of the possible orientations needs to be limited to a single landscape view. The parent to the modal table view needs to have the shouldAutoRotateToInterfaceOrientation method return YES only if the orientation matches the only orientation in the plist file.

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Overriden to allow any orientation.
return interfaceOrientation = UIInterfaceOrientationLandscapeRight;

}

the modal viewcontroller should return NO for the same method.

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Based on

When the application is in landscape mode (which I plan to force), displaying a modal view causes the parent view to rotate to portrait mode.

and

As per request here is the contents of the shouldAutoRotate method of the SavedGamesTableViewController

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Override to allow orientations other than the default portrait orientation.
return YES;
}

So what you're saying is that the parent view controller is not yet set to force only using landscape orientation, and when you show a modal view that is set to allow all orientations, you're wondering why your parent view rotates to portrait when you rotate the device to portrait? I don't understand your question... aren't you saying that parent view controller is currently set to allow rotation to portrait? Isn't this behaviour exactly what should happen?

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I had a similar problem when bringing up a modal mail view. Forcing the rotation didn't work for me, but calling presentModalViewController on the application's main view controller rather than a child view controller solved the issue.

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I was seeing the same behavior; in my case the problem was I had implemented shouldAutorotateToInterfaceOrientation to return YES unconditionally for the parent view controller but NOT for the presented modal view controller. So I suspect Shaggy Frog's comment is the key: whether you want to force landscape mode or not, you need to make sure that the two view controllers' shouldAutorotateToInterfaceOrientation implementations agree or weirdness will ensue.

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UIViewController *vc = /* create view controller */;
UINavigationController *nc = nil;
if (IOS_VERSION_LESS_THAN_6_0) {
    nc = [[MyCustomNavigationControllerSupportingAllOrientations alloc] initWithRootViewController:vc];
} else {
    nc = [[UINavigationController alloc] initWithRootViewController:vc];
}
[self.navigationController presentModalViewController:nc animated:YES];

On iOS6 I use a UINavigationController.

On pre-iOS6 I subclass UINavigationController, like this:

@interface MyCustomNavigationControllerSupportingAllOrientations : UINavigationController
@end

@implementation MyCustomNavigationControllerSupportingAllOrientations
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}
@end