diff --git a/Mastodon/Scene/Share/NavigationController/AdaptiveStatusBarStyleNavigationController.swift b/Mastodon/Scene/Share/NavigationController/AdaptiveStatusBarStyleNavigationController.swift index aac23285..f4ad467d 100644 --- a/Mastodon/Scene/Share/NavigationController/AdaptiveStatusBarStyleNavigationController.swift +++ b/Mastodon/Scene/Share/NavigationController/AdaptiveStatusBarStyleNavigationController.swift @@ -10,7 +10,41 @@ import UIKit // Make status bar style adaptive for child view controller // SeeAlso: `modalPresentationCapturesStatusBarAppearance` class AdaptiveStatusBarStyleNavigationController: UINavigationController { + + private lazy var fullWidthBackGestureRecognizer = UIPanGestureRecognizer() + override var childForStatusBarStyle: UIViewController? { visibleViewController } } + +// ref: https://stackoverflow.com/a/60598558/3797903 +extension AdaptiveStatusBarStyleNavigationController { + + override func viewDidLoad() { + super.viewDidLoad() + setupFullWidthBackGesture() + } + + private func setupFullWidthBackGesture() { + // The trick here is to wire up our full-width `fullWidthBackGestureRecognizer` to execute the same handler as + // the system `interactivePopGestureRecognizer`. That's done by assigning the same "targets" (effectively + // object and selector) of the system one to our gesture recognizer. + guard let interactivePopGestureRecognizer = interactivePopGestureRecognizer, + let targets = interactivePopGestureRecognizer.value(forKey: "targets") + else { return } + + fullWidthBackGestureRecognizer.setValue(targets, forKey: "targets") + fullWidthBackGestureRecognizer.delegate = self + view.addGestureRecognizer(fullWidthBackGestureRecognizer) + } +} + +// MARK: - UIGestureRecognizerDelegate +extension AdaptiveStatusBarStyleNavigationController: UIGestureRecognizerDelegate { + func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool { + let isSystemSwipeToBackEnabled = interactivePopGestureRecognizer?.isEnabled == true + let isThereStackedViewControllers = viewControllers.count > 1 + return isSystemSwipeToBackEnabled && isThereStackedViewControllers + } +}