nevan king nevan king - 5 months ago 53
iOS Question

isBeingDismissed not set in viewWillDisappear:

I have some code to clean up in my

viewWillDisappear:
, which I only want to use when the view is moving back to the parent view controller.

- (void)viewWillDisappear:(BOOL)animated
{
if ([self isMovingFromParentViewController] || [self isBeingDismissed]) {
NSLog(@"isMovingFromParentViewController or isBeingDismissed");
// clean up
}
[super viewWillDisappear:animated];
}


The view can be presented in two ways: it can be pushed by a navigation controller, or presented as a modal view controller (from the same navigation controller). If it's pushed, then popped (pressing the back button), my clean-up code runs. If it it presented as a modal view controller, then dismissed, the code doesn't run.

I dismiss like so:

[rootViewController dismissModalViewControllerAnimated:YES];


My question is: why isn't
isBeingDismissed
set when I dismiss my view controller?

Answer

Your issue is how you are dismissing your modal view. How is rootViewController being defined?

When I call [self dismissModalViewControllerAnimated:YES] then [self isBeingDismissed] evaluates to true.

When I call [parentViewController dismissModalViewControllerAnimated:YES] then [self isBeingDismissed] evaluates to true, whereby parentViewController is the UIViewController that presented the modal view (note: not a UINavigationController).