dismissViewControllerAnimated completion block is not called

10
votes

I'm trying to dismiss a view controller like this:

[composeViewController dismissViewControllerAnimated:YES completion:^{

    NSLog(@"Hello"); // Never outputted
}];

The view controller is dismissed, but for some reason the completion block is never called.

I have never had any issues with completion block not being called with other view controllers.

This view controller is "special" though, because it's added as a child view controller (which I have not worked with previously in my app). Does this impose any side effects why the completion block is not called?

It's added like this: 

UIViewController *rootVC = [UIApplication sharedApplication].delegate.window.rootViewController;
[rootVC addChildViewController:self];
[rootVC.view addSubview:self.view];
[self didMoveToParentViewController:rootVC];
2
iosobjective-ccocoa-touchuiviewcontrollerobjective-c-blocks
addChildViewController: actually pushes that view controller onto the navigation stack. You have to pop it off before that block can fire - CodaFi
I tried doing [composeViewController removeFromParentViewController]; (I can see that it's removed from childViewControllers property of rootViewController) before calling dismiss... but the completion block is still not called. - Peter Warbo
po the navigation stack, then. - CodaFi
Why don't you present it using -presentViewController... ? the dismiss method is paired with this one. Or do everything manually. Whrn you present a VC there are lot of properties set in the container: presentingViewController, presentedViewController etc... if you do manually you won't have them valorized - Andrea
@Andrea I usually use -presentViewController... but this view controller I'm using is from an external source so I don't have any control over how they want it to be presented. - Peter Warbo

2 Answers

1
votes

Found out what the issue was: the 3rd party view controller I was using had overridden - (void)dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion without actually calling completion()

0
votes

If you present a modal, is the view controller that receive the message (or the top in hierarchy , I still didn't get that) that handles all the process of adding the child v.c. swapping view etc. It seems that you are doing a mix of the two techniques. Just use one.
So present it using - (void)presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion ad dismiss it using dismissViewController let the view controller manages everything.