Strange warning dismissing modal view controller

Question

I'm working on iOS 6. My application has a standard navigation controller with embedded a CustomViewController. In this controller I create a modal view like this:

-(IBAction)presentModalList:(id)sender {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    StationsListViewController *list = [storyboard instantiateViewControllerWithIdentifier:@"StationsListViewController"];
    [list setStationsData: [self.stationsData allValues]];
    [self presentModalViewController:list animated:YES];
}

The modal controller show perfectly but dismissing generates a warning. The dismiss method in this controller is:

-(IBAction)backToMap
{
    [self dismissModalViewControllerAnimated:YES];
}

The warning generated is Warning:

Any clues about that?

Thanks

Answer 1

I realise this is a late answer but maybe this will help someone else looking for a solution to this, here is what I did:

-(IBAction)backToMap
{
    if (![[self modalViewController] isBeingDismissed])
        [self dismissModalViewControllerAnimated:YES];
}

For me, i found that line of code was being called multiple times, I couldn't find out why so this was the easiest fix.

Answer 2

Thanks JDx for getting me on the right track. I adapted it to form this solution, which will remove the warning without using functions that are deprecated in iOS 6:

-(IBAction)backToMap
{
    if (![self.presentedViewController isBeingDismissed]) {
        [self dismissViewControllerAnimated:YES completion:^{}];
    }
}

Answer 3

I found this approach to be unreliable - say one case in five I'd still see the error.

My solution was to use the completion block to set a flag which controls whether or not it's safe to dismiss - that way you don't need to check whether or not the view is being dismissed.

-(IBAction)presentModalView:(id)sender {
    :
    self.canDismiss = NO;
    [self presentViewController:aVC animated:YES completion:^{ 
      self.canDismiss = YES; 
     }];
    :
}

In the bit of code where the dismiss occurs, just check the flag:

-(void)dismisser {
    :
    if (self.canDismiss) {
      [self dismissViewControllerAnimated:YES completion:nil];
    }
    :
}

Hey presto, no more errors!

Answer 4

Targeting iOS6, this is what worked for me:

if (![self.presentedViewController isBeingDismissed]) 
    [self.presentedViewController dismissViewControllerAnimated:YES
                                                     completion:nil];

Answer 5

You can do whatever you want after the completion of the dismiss method as:

-(IBAction)backToMap
{
    [self dismissViewControllerAnimated:YES
                             completion:^{
                                 //Do something here
                             }];
}