iOS: Detect dismissViewControllerAnimated while using UIModalPresentationStyle.OverCurrentContext

Question

In my ViewControllerA, I try to show ViewControllerB by calling:

let VC2 = ViewControllerB()
VC2.modalPresentationStyle = UIModalPresentationStyle.OverCurrentContext
presentViewController(VC2, animated: true, completion: nil)

So the content of ViewControllerB is shown on top of ViewControllerA.

When pressing a button in ViewControllerB, this is called:

dismissViewControllerAnimated(true, completion: nil)

However, viewWillAppear of ViewControllerA is not called.

If the line VC2.modalPresentationStyle = UIModalPresentationStyle.OverCurrentContext is removed, then viewWillAppear of ViewControllerA is called.

While using UIModalPresentationStyle.OverCurrentContext, viewWillAppear of ViewControllerA is not called. How to detect if ViewControllerB is dismissed in ViewControllerA in this situation? I want to run some codes in ViewControllerA, but not using completion of dismissViewControllerAnimated in ViewControllerB.

Answer 1

Why don't you create your own completion block on ViewControllerB? You can assign it when you create the instance of ViewControllerB on ViewControllerA, then you can just call that when you call dismissViewControllerAnimated on ViewControllerB.