UIViewController does not auto rotate.

Answer 1

• (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{ return YES; } The above method if u using, you will able to call many time if u want with out any error.

Answer 2

I think there is no strange behavior here, it is called only one which is right. There is no need to call more than one to decide if the device should rotate to a direction or not.

This method just ask if the device should rotate to a direction or not. If you want to handle the orientation change, you should register for the notification from the UIDeviceDidChangeOrientationNotification and override the following method:

- (void)orientationChanged:(NSNotification *)notification
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation) &&
    !isShowingLandscapeView)
    {
        [self presentModalViewController:self.landscapeViewController
                            animated:YES];
        isShowingLandscapeView = YES;
    }
    else if (deviceOrientation == UIDeviceOrientationPortrait &&
             isShowingLandscapeView)
    {
        [self dismissModalViewControllerAnimated:YES];
        isShowingLandscapeView = NO;
    }
}

See more here.

Answer 3

I am not sure whether it's the same reason as your case. But I experienced the same thing. the shouldAutorotateToInterfaceOrientation was only called once in the beginning. After some serious debugging by taking code apart, I found that the reason is in my overridden init method. I had this before:

- (id)initWithAlbum:(PhotoAlbum *)theAlbum {
    if (self) {     
        self.photoAlbum = theAlbum;     
    }
    return self;
}

And then I changed to this

- (id)initWithAlbum:(PhotoAlbum *)theAlbum {
    if (self = [super init]) {      
        self.photoAlbum = theAlbum;     
    }
    return self;
}

Note: the only difference is I added [super init] to call the parent init. After this change, the rotation works well and the shouldAutorotateToInterfaceOrientation is being called everytime I rotate the screen. Hope this help.

Answer 4

Thank you DaiLak! This solved my problem!!!

Answer 5

See Apple's official Q&A on this issue:

Why won't my UIViewController rotate with the device?

http://developer.apple.com/library/ios/#qa/qa2010/qa1688.html