How to use animateWithDuration: when presenting view controller on iOS 7?

Question

I'm currently using the following code in order to present my view controller.

CATransition* transition = [CATransition animation];
transition.duration = 1;
transition.type = kCATransitionFade;
transition.subtype = kCATransitionFromBottom;
[self.view.window.layer addAnimation:transition forKey:kCATransition];
[self presentViewController:viewController animated:NO completion:nil];

I need to use more complex animation utilizing UIView animateWithDuration method. It is just modal presentation and background view controller should stay there. How can I animate presenting view controller's view?

Update: next version of code :)

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:NULL];
RootViewControllerEx *viewController = (RootViewControllerEx *)[sb instantiateViewControllerWithIdentifier:@"SB_RDVC"];
viewController.transitioningDelegate = self;
viewController.modalPresentationStyle = UIModalPresentationCustom;
[self presentViewController:viewController animated:YES completion:nil];
...

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    ...
}

VC in storyboard doesn't have any segue specified, it stays lonely in storyboard :)

Answer 1

You need to use UIModalPresentationCustom as your UIViewController's modalPresentationStyle.

You then need to create a class that conforms to the UIViewControllerTransitioningDelegate and set that your on presentedViewController.

Example

YourViewController *viewController = [[YourViewController alloc] init];
viewController.delegate = self;
viewController.transitioningDelegate = self;
viewController.modalPresentationStyle = UIModalPresentationCustom;

[self.navigationController presentViewController:viewController animated:YES completion:nil];

You must then implement the following method:

- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source;

Which returns an object that conforms to a UIViewControllerAnimatedTransitioning protocol, that implements the following method:

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UIView *inView = [transitionContext containerView];
    UIView *toView = [[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey] view];

    toView.frame = //CGRectMake(0,0,0,0);
    [inView addSubview:toView];
    // Use whatever animateWithDuration you need
    [UIView animateWithDuration:0.6f delay:0.0f usingSpringWithDamping:0.7f initialSpringVelocity:0.5f options:UIViewAnimationOptionCurveEaseIn animations:^{
// Custom animation here
    } completion:^(BOOL finished) {
        // IMPORTANT
        [transitionContext completeTransition:YES];
    }];
}

Always remember to tell the context when a transition is complete, otherwise you'll enter an unstable state.