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Before iOS 13, presented view controllers used to cover the entire screen. And, when dismissed, the parent view controller viewDidAppear function were executed.
Now iOS 13 will present view controllers as a sheet as default, which means the card will partially cover the underlying view controller, which means that viewDidAppear will not be called, because the parent view controller has never actually disappeared.
Is there a way to detect that the presented view controller sheet was dismissed? Some other function I can override in the parent view controller rather than using some sort of delegate?
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The UIViewController class defines the shared behavior that's common to all view controllers. You rarely create instances of the UIViewController class directly. Instead, you subclass UIViewController and add the methods and properties needed to manage the view controller's view hierarchy.
A navigation controller is a container view controller that manages one or more child view controllers in a navigation interface. In this type of interface, only one child view controller is visible at a time.
And, when dismissed, the parent view controller viewDidAppear function were executed. Now iOS 13 will present view controllers as a sheet as default, which means the card will partially cover the underlying view controller, which means that viewDidAppear will not be called, because the parent view controller has never actually disappeared.
The lack of a general runtime-generated event informing you that a presented view controller, whether fullscreen or not, has been dismissed, is indeed troublesome; but it's not a new issue, because there have always been non-fullscreen presented view controllers. It's just that now (in iOS 13) there are more of them!
It will alert you to a dismissal via isBeingDismissed boolean flag. ** If the user is halfway through the swipe down and swipes the card back up, it'll still register as being dismissed, even if the card is not dismissed. But that's an edge case you may not care about. Show activity on this post. DRAG OR CALL DISMISS FUNC will work with below code.
Is there a way to detect that the presented view controller sheet was dismissed?
Yes.
Some other function I can override in the parent view controller rather than using some sort of delegate?
No. "Some sort of delegate" is how you do it. Make yourself the presentation controller's delegate and override presentationControllerDidDismiss(_:).
https://developer.apple.com/documentation/uikit/uiadaptivepresentationcontrollerdelegate/3229889-presentationcontrollerdiddismiss
The lack of a general runtime-generated event informing you that a presented view controller, whether fullscreen or not, has been dismissed, is indeed troublesome; but it's not a new issue, because there have always been non-fullscreen presented view controllers. It's just that now (in iOS 13) there are more of them! I devote a separate question-and-answer to this topic elsewhere: Unified UIViewController "became frontmost" detection?.
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