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Question:

I am trying to write an app with some camera function, and I use an overlay view to decorate it with an image.

This is how I implement the app: I use the UIImagePickerController to who the user what the camera takes in, and add a UIImageView onto the cameraOverlayView as a subview so that it works like this:
(image at http://www.manna-soft.com/test/uploads/UIImagePickerView-portrait.jpg)

This works fine until the iPad2 come into place... it autorotates like this and ruin the layout:
(image at http://www.manna-soft.com/test/uploads/UIImagePickerView-landscape.jpg)

The UIImagePickerController never rotates on iphone, ipod touch or the original iPad, but it does on iPad2. the class reference of UIImagePickerContrller says that it "supports portrait mode only", but what happens is it autorotates like that....
Is there a way that I can disable the autorotation?
I tried returning NO in the method shouldAutorotateToInterfaceOrientation: of the view controller which the UIImagePickerController is presented, but it still rotates.

Thanks in advance.


Best Answer:


You can compensate the rotation of your ipad by roatting the overlay view of your UIImagePickerController. Fisrt you have to capture the notifications using:

[[NSNotificationCenter defaultCenter]     addObserver:self selector:@selector(notificationCallback:) name:nil object:nil];

Then use this code:

 - (void) notificationCallback:(NSNotification *) notification {
  if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
    if ([[notification name] isEqualToString:@"UIDeviceOrientationDidChangeNotification"]) { 
        UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
        switch ( orientation ) {
            case UIInterfaceOrientationLandscapeRight:
                NSLog(@"LandcapeRight");
                [UIView beginAnimations:@"LandscapeRight" context:UIGraphicsGetCurrentContext()];
                [UIView setAnimationDuration:0.4];
                m_uiCameraOverlayView.transform = CGAffineTransformIdentity;
                [UIView commitAnimations];
                break;
            case UIInterfaceOrientationLandscapeLeft:
                NSLog(@"LandscapeLeft");
                [UIView beginAnimations:@"LandcapeLeft" context:UIGraphicsGetCurrentContext()];
                [UIView setAnimationDuration:0.4];
                m_uiCameraOverlayView.transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(M_PI), 0, 0);
                [UIView commitAnimations];
                break;
            case UIInterfaceOrientationPortraitUpsideDown:
                NSLog(@"UpsideDown");
                [UIView beginAnimations:@"UpsideDown" context:UIGraphicsGetCurrentContext()];
                [UIView setAnimationDuration:0.4];
                m_uiCameraOverlayView.transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(-M_PI / 2), -128, -128);
                [UIView commitAnimations];
                break;
            case UIInterfaceOrientationPortrait:
                NSLog(@"Portrait");
                [UIView beginAnimations:@"Portrait" context:UIGraphicsGetCurrentContext()];
                [UIView setAnimationDuration:0.4];
                m_uiCameraOverlayView.transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(M_PI / 2), 128, 128);
                [UIView commitAnimations];
                break;
            default:
                NSLog(@"????");
                break;
        }
    }
 }
}



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