Disable gesture to pull down form/page sheet modal presentation

Question

In iOS 13 modal presentations using the form and page sheet style can be dismissed with a pan down gesture. This is problematic in one of my form sheets because the user dra

Answer 1

In my case, I have a modal screen with a view that receives touches to capture customer signatures.

Disabling the gesture recognizer in the navigation controller solved the problem, preventing the modal interactive dismissal from being triggered at all.

The following methods are implemented in our modal view controller, and are called via delegate from our custom signature view.

Called from touchesBegan:

private func disableDismissalRecognizers() {
    navigationController?.presentationController?.presentedView?.gestureRecognizers?.forEach {
        $0.isEnabled = false
    }
}

Called from touchesEnded:

private func enableDismissalRecognizers() {
    navigationController?.presentationController?.presentedView?.gestureRecognizers?.forEach {
        $0.isEnabled = true
    }
}

Here is a GIF showing the behavior:

This question, flagged as duplicate, describes better the issue I had: Disabling interactive dismissal of presented view controller on iOS 13 when dragging from the main view