Modal view controller presenter problem

I have a modal view controller, whom I'll call Bob. Bob is presented by Amy, who is Bob's delegate. When the user is done using Bob, Bob calls a method that is defined in Bob's delegate protocol. Amy responds by dismissing Bob.

There is a piece of code that is supposed to be run after Amy's parent view loads. It runs well when Amy is loaded into the navigation controller's stack, but not when Bob calls the aforementioned delegate method. If the code is in viewDidAppear, Bob won't even go away.

I did not knowingly cause this behavior, and I am not using any relevant third-party code.

 

When another view controller causes Amy to be displayed, the code in Amy's viewDidLoad method is executed. That does not happen when Bob is dismissed.
I moved the code to Amy's viewDidAppear method. After that, I ran the app. Bob didn't even disappear.

Here's the code that defines how Amy responds:

Code:

-(void)bobDelegateMethod
{
// Irrelevant code
    [self dismissViewControllerAnimated:false completion:nil];
}

 

OK, it looks like the view did appear for a very short amount of time before Bob reappears. However, this is not the behavior I expect. I think I can fix my app.

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Problem solved (sort of).

Edit: For some reason, the delegate method gets called multiple times. I don't know why.
Edit #2: it must be because Bob registered Amy to listen for an AVPlayerItem notification. I changed that.