show screenshot full screen on landscape

[baramedia]

hello,
i wanna show a screenshot taken by uipickercontroller, but the problem is that the screen not show on fullscreen!

- (void)imagePickerController:(UIImagePickerController *)aPicker didFinishPickingMediaWithInfo:(NSDictionary *)info {

UIImage *screenshot = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
UIImage *originalImage = screenshot;
    CGSize destinationSize = CGSizeMake(480,320); 
    UIGraphicsBeginImageContext(destinationSize);
    [originalImage drawInRect:CGRectMake(0,0,destinationSize.width,destinationSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    UIImageView *viewThumbnail = [[UIImageView alloc] initWithImage:newImage];
    viewThumbnail.transform = CGAffineTransformMakeRotation(M_PI / 2);
[aPicker.cameraOverlayView addSubview:viewThumbnail];
    
}

help!