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Implement shouldTransition(for scrollView: UIScrollView?) delegate method #105

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4 changes: 4 additions & 0 deletions Source/DeckPresentationController.swift
Original file line number Diff line number Diff line change
Expand Up @@ -561,6 +561,10 @@ final class DeckPresentationController: UIPresentationController, UIGestureRecog
return
}

if let deckViewController = presentedViewController as? DeckTransitionViewControllerProtocol {
guard deckViewController.shouldTransition!(for: ScrollViewDetector(withViewController: presentedViewController).scrollView) else { return }
}

switch gestureRecognizer.state {

case .began:
Expand Down
6 changes: 6 additions & 0 deletions Source/DeckTransitionViewControllerProtocol.swift
Original file line number Diff line number Diff line change
Expand Up @@ -57,5 +57,11 @@ import UIKit
/// `childViewControllerForDeck` variable is also implemented.
@objc optional var scrollViewForDeck: UIScrollView { get }

/// Calls a delegate method to determine whether or not a Deck transition
/// should take place.

/// - Note: Default for this method always returns `true`
@objc optional func shouldTransition(for scrollView: UIScrollView?) -> Bool

}