我一直在学习Paul Hudson关于协调器模式的教程，并遇到了一个必须使用选项卡栏控制器的实例。在展示了选项卡栏控制器之后，即使我有导航控制器实例，我也无法从一个地方移动到另一个地方。
我有一个主协调器来启动应用程序流：
class MainCoordinator: Coordinator {
var childCoordinators = [Coordinator]()
var navigationController: UINavigationController
init(navigationController: UINavigationController) {
self.navigationController = navigationController
}
func start() {
let vc = ViewController.instantiate(storyboard: .main)
vc.coordinator = self
navigationController.pushViewController(vc, animated: false)
}
func navigateToCreateAccount(){
let vc = CreateAccountVC.instantiate(storyboard: .main)
vc.coordinator = self
navigationController.pushViewController(vc, animated: true)
}
func navigateToBuySubscription(){
let vc = BuySubscriptionVC.instantiate(storyboard: .main)
vc.coordinator = self
navigationController.pushViewController(vc, animated: true)
}
func navigateToTabBar(){
let vc = TabBarCoordinator(navigationController: navigationController)
childCoordinators.append(vc)
vc.start(type: .LoginSession)
}
}
我的选项卡栏协调员为每个页面部分都有单独的协调员，这是我的选项卡条协调员：
class TabBarCoordinator: Coordinator {
var childCoordinators = [Coordinator]()
var navigationController: UINavigationController
init(navigationController: UINavigationController) {
self.navigationController = navigationController
}
func start(type: NavigationType) {
let vc = NewsFeedTBC.instantiate(storyboard: .newsfeed)
//TODO: check the need of assigning this navigation controller
vc.coordinator = self
//TopRated VC Related
let topRatedNavigationController = UINavigationController()
topRatedNavigationController.tabBarItem = UITabBarItem(tabBarSystemItem: .topRated, tag: 0)
let topRatedCoordinator = TopRatedCoordinator(navigationController: topRatedNavigationController)
topRatedCoordinator.start()
//Bookmarks VC Related
let bookmarksNavigationController = UINavigationController()
bookmarksNavigationController.tabBarItem = UITabBarItem(tabBarSystemItem: .bookmarks, tag: 1)
let bookmarksCoordinator = BookmarksCoordinator(navigationController: bookmarksNavigationController)
bookmarksCoordinator.start()
//Downloads VC Related
let downloadsNavigationController = UINavigationController()
downloadsNavigationController.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 2)
let downloadsCoordinator = DownloadsCoordinator(navigationController: downloadsNavigationController)
downloadsCoordinator.start()
vc.modalPresentationStyle = .fullScreen
vc.viewControllers = [
topRatedNavigationController,
downloadsNavigationController,
bookmarksNavigationController
]
type == .LoginSession ? navigationController.present(vc, animated: true, completion: nil) : navigationController.pushViewController(vc, animated: true)
}
}
例如，这是上面提到的个人协调员：
class BookmarksCoordinator: Coordinator {
var childCoordinators = [Coordinator]()
var navigationController: UINavigationController
init(navigationController: UINavigationController) {
self.navigationController = navigationController
}
func start() {
let vc = BookMarksVC.instantiate(storyboard: .newsfeed)
vc.coordinator = self
navigationController.pushViewController(vc, animated: true)
}
func navigateToProfile(){
let vc = ProfileVC.instantiate(storyboard: .newsfeed)
vc.coordinator = self
navigationController.present(vc, animated: true, completion: nil)
}
}
当我试图离开这些单独的控制器时，就会出现问题。
找到了我正在搜索的问题。
func start() {
let vc = NewsFeedTabBarVC.instantiate(storyBoard: .NewsFeed)
vc.coordinator = self
vc.sideMenuDelegate = self
//Home VC Related
let homeNavigationController = UINavigationController()
homeNavigationController.tabBarItem = UITabBarItem(title: nil, image: UIImage(named: "home"), tag: 0)
let homeCoordinator = HomeNavigator(navigationController: homeNavigationController)
childCoordinators.append(homeCoordinator)
homeCoordinator.avatarDelegate = vc
homeCoordinator.start()
//Friends VC Related
let friendsNavigationController = UINavigationController()
friendsNavigationController.tabBarItem = UITabBarItem(title: nil, image: UIImage(named: "users"), tag: 1)
let friendsCoordinator = FriendsNavigator(navigationController: friendsNavigationController)
childCoordinators.append(friendsCoordinator)
friendsCoordinator.start()
}