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1. Enable pan edge to pop view controller. 2. Queue popping and pushing actions.
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| // | |
| // NavigationController.swift | |
| // EvoRadio | |
| // | |
| // Created by Jarvis on 16/4/17. | |
| // Copyright © 2016年 JQTech. All rights reserved. | |
| // | |
| import UIKit | |
| class NavigationController: UINavigationController { | |
| var isAnimated: Bool = false | |
| var popQueue = [PopItem]() | |
| override var prefersStatusBarHidden : Bool { | |
| return false | |
| } | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| interactivePopGestureRecognizer?.delegate = self; | |
| delegate = self | |
| } | |
| override var preferredStatusBarStyle : UIStatusBarStyle { | |
| return .lightContent | |
| } | |
| override func popViewController(animated: Bool) -> UIViewController? { | |
| if isAnimated { | |
| enqueueViewController(nil, animated: animated) | |
| return nil | |
| }else { | |
| return super.popViewController(animated: animated) | |
| } | |
| } | |
| override func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]? { | |
| if isAnimated { | |
| enqueueViewController(viewController, animated: animated) | |
| return nil | |
| }else { | |
| return super.popToViewController(viewController, animated: animated) | |
| } | |
| } | |
| override func pushViewController(_ viewController: UIViewController, animated: Bool) { | |
| interactivePopGestureRecognizer?.isEnabled = false | |
| if isAnimated || hasPopViewController() { | |
| return | |
| } | |
| isAnimated = true | |
| super.pushViewController(viewController, animated: animated) | |
| } | |
| /** Insert view controller to queue */ | |
| func enqueueViewController(_ viewController: UIViewController?, animated: Bool) { | |
| let item = PopItem(controller: viewController, animated: animated) | |
| popQueue.append(item) | |
| } | |
| /** Pop view controller from queue */ | |
| func dequeueViewController(_ navigationController: UINavigationController) { | |
| if popQueue.count > 0 { | |
| let item = popQueue.first | |
| popQueue.remove(at: 0) | |
| if let controller = item?.controller { | |
| navigationController.popToViewController(controller, animated: (item?.animated)!) | |
| }else { | |
| navigationController.popViewController(animated: (item?.animated)!) | |
| } | |
| } | |
| } | |
| func hasPopViewController() -> Bool { | |
| return popQueue.count > 0 | |
| } | |
| } | |
| //MARK: navigation controller delegates | |
| extension NavigationController: UINavigationControllerDelegate, UINavigationBarDelegate { | |
| func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) { | |
| isAnimated = false | |
| interactivePopGestureRecognizer?.isEnabled = true | |
| // pop next view controller in queue | |
| dequeueViewController(navigationController) | |
| } | |
| } | |
| //MARK: gesuture recognizer delegate | |
| extension NavigationController: UIGestureRecognizerDelegate { | |
| // if navigation controller's sub view controller more than 1, enable pan gesture to pop itself | |
| func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool { | |
| if viewControllers.count > 1 { | |
| return true | |
| } | |
| return false | |
| } | |
| } | |
| struct PopItem { | |
| var controller: UIViewController? | |
| var animated: Bool | |
| } |
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