Allow left or right transition for UINavigationController

UINavigationController+CustomTransitionAnimation.m

- (void)loadViewController:(UIViewController*)viewController withTransition:(AJRNavigationControllerTransition)transition
{
    // This currently only works for a landscape only App.
    // Needs to check orientation as nav controller view isn't rotated.
    NSString* subtype = kCATransitionFromBottom;
    
    switch (transition)
    {
        case AJRNavigationControllerTransition_FromLeft:
        {
            subtype = ([self interfaceOrientation] == UIInterfaceOrientationLandscapeLeft) ? kCATransitionFromTop : kCATransitionFromBottom;
            break;
        }
        case AJRNavigationControllerTransition_FromRight:
        {
            subtype = ([self interfaceOrientation] == UIInterfaceOrientationLandscapeRight) ? kCATransitionFromTop : kCATransitionFromBottom;
            break;
        }
        default:
            break;
    }
    
    CATransition *animation = [CATransition animation];
    [animation setDuration:0.25];
    [animation setType:kCATransitionPush];
    [animation setSubtype:subtype];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
	
    [[self.navigationController.view layer] addAnimation:animation forKey:@"SwitchToView1"];
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.25];
    
    [UIView setAnimationBeginsFromCurrentState:YES];        
    [self.navigationController pushViewController:viewController animated:NO];
    
    [UIView commitAnimations];    
}