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extension UINavigationController {
// 1
static private var coordinatorHelperKey = "UINavigationController.TransitionCoordinatorHelper"
// 2
var transitionCoordinatorHelper: TransitionCoordinator? {
return objc_getAssociatedObject(self, &UINavigationController.coordinatorHelperKey) as? TransitionCoordinator
}
func addCustomTransitioning() {
// 3
var object = objc_getAssociatedObject(self, &UINavigationController.coordinatorHelperKey)
guard object == nil else {
return
}
object = TransitionCoordinator()
let nonatomic = objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC
objc_setAssociatedObject(self, &UINavigationController.coordinatorHelperKey, object, nonatomic)
// 4
delegate = object as? TransitionCoordinator
// 5
let edgeSwipeGestureRecognizer = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(handleSwipe(_:)))
edgeSwipeGestureRecognizer.edges = .left
view.addGestureRecognizer(edgeSwipeGestureRecognizer)
}
// 6
@objc func handleSwipe(_ gestureRecognizer: UIScreenEdgePanGestureRecognizer) {
guard let gestureRecognizerView = gestureRecognizer.view else {
transitionCoordinatorHelper?.interactionController = nil
return
}
let percent = gestureRecognizer.translation(in: gestureRecognizerView).x / gestureRecognizerView.bounds.size.width
if gestureRecognizer.state == .began {
transitionCoordinatorHelper?.interactionController = UIPercentDrivenInteractiveTransition()
popViewController(animated: true)
} else if gestureRecognizer.state == .changed {
transitionCoordinatorHelper?.interactionController?.update(percent)
} else if gestureRecognizer.state == .ended {
if percent > 0.5 && gestureRecognizer.state != .cancelled {
transitionCoordinatorHelper?.interactionController?.finish()
} else {
transitionCoordinatorHelper?.interactionController?.cancel()
}
transitionCoordinatorHelper?.interactionController = nil
}
}
}
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