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

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.