ViewControllerTransitionsPart1-4

TTViewController.m

#pragma mark - UINavigationControllerDelegate

- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation
                                                fromViewController:(UIViewController *)fromVC
                                                  toViewController:(UIViewController *)toVC
{
	switch(operation)
	{
		case UINavigationControllerOperationPush:
			return [[TTPushAnimator alloc] init];
		case UINavigationControllerOperationPop:
			return [[TTPopAnimator alloc] init];
		default:
			return nil;
	}
}