我正在研究 MVVM-C 架构，但我不确定在选择一个选项卡时如何使用不同的选项卡实例化多个协调器。

这是我的主要应用程序协调器类...

protocol UINavigationControllerType: class {
func pushViewController(_ viewController: UIViewController, animated: Bool)
func popViewController(animated: Bool) -> UIViewController?
}

protocol Coordinator: class {
func start()
}

final class AppCoordinator: Coordinator {
// MARK: - Properties
var managedObjectContext: NSManagedObjectContext!
var coordinators = [String : Coordinator]()

var tabController: UITabBarController?

// MARK: - Object Lifecycle
init(moc: NSManagedObjectContext, tabController: UITabBarController) {
    self.managedObjectContext = moc
    self.tabController = tabController
}

// MARK: - Coordinator
func start() {
    guard let tabController = tabController else {return}

    let profileNavigationController = NavigationController()
    profileNavigationController.tabBarItem = UITabBarItem(title: "Profile", image: UIImage(named: "profileUnselected"), selectedImage: UIImage(named: "profileSelected"))

    let plansNavigationController = NavigationController()
    plansNavigationController.tabBarItem = UITabBarItem(title: "Plans", image: UIImage(named: "plansUnselected"), selectedImage: UIImage(named: "plansSelected"))

    tabController.viewControllers = [profileNavigationController, plansNavigationController]
    tabController.selectedViewController = profileNavigationController

    let profileCoordinator = ProfileCoordinator(navigationController: profileNavigationController)
    profileCoordinator.managedObjectContext = managedObjectContext
    coordinators["profileCoordinator"] = profileCoordinator
    profileCoordinator.delegate = self
    profileCoordinator.start()
}
}

// MARK: - ProfileCoordinatorDelegate
extension AppCoordinator: ProfileCoordinatorDelegate {}

So how would i go from the current coordinator (ProfileCoordinator) to the PlansCoordinator when the tab is selected?

最佳答案

我的 Coordinator 结构与您的不同，但它可能对您有所帮助。在我的例子中，Coordinator 协议(protocol)有一个 rootViewController 属性，它指向那个 Coordinator 的 ViewController。

我的 AppCoordinator 然后持久化一个 TabCoordinator，它看起来有点像这样:(在实际代码中，持久化的协调器是 NavigationCoordinators，它是保存 NavigationControllers 的特殊协调器。在这个例子中，我只是添加了 ViewControllers 并删除了内存管理的东西，以使其更容易理解。)

final class TabCoordinator: NSObject, Coordinator {

var rootViewController: UIViewController {
    return tabController
}

let tabController: UITabBarController

let homeCoordinator: HomeCoordinator
let historyCoordinator: HistoryCoordinator
let profileCoordinator: ProfileCoordinator

var coordinators: [Coordinator] {
    return [homeCoordinator, historyCoordinator, profileCoordinator]
}

init(client: HTTPClient, persistence: Persistence) {

    tabController = UITabBarController()

    homeCoordinator = HomeCoordinator(client: client, persistence: persistence)

    historyCoordinator = HistoryCoordinator(client: client, persistence: persistence)

    profileCoordinator = ProfileCoordinator(client: client, persistence: persistence)

    var controllers: [UIViewController] = []

    let homeViewController = homeCoordinator.rootViewController
    homeViewController.tabBarItem = UITabBarItem(title: Localization.homeTab.string, image: Asset.iconMenuRecharge.image, selectedImage: Asset.iconMenuRechargeActivated.image)

    let historyViewController = historyCoordinator.rootViewController
    historyViewController.tabBarItem = UITabBarItem(title: Localization.walletTab.string, image: Asset.iconMenuWallet.image, selectedImage: Asset.iconMenuWalletActivated.image)

    let profileViewController = profileCoordinator.rootViewController
    profileViewController.tabBarItem = UITabBarItem(title: Localization.profileTab.string, image: Asset.iconMenuProfile.image, selectedImage: Asset.iconMenuProfileActivated.image)

    super.init()

    controllers.append(homeViewController)
    controllers.append(historyViewController)
    controllers.append(profileViewController)

    tabController.viewControllers = controllers
    tabController.tabBar.isTranslucent = false
    tabController.delegate = self

}
}

基本上，您的 TabBarController 是一个 TabCoordinator，它的 rootViewController 是一个 TabBarController。 TabCoordinator 实例化相关的协调器并将它们各自的 rootViewControllers 添加到选项卡。

下面是 NavigationCoordinator 的基本实现:

class NavigationCoordinator: NSObject, Coordinator {    

    public var navigationController: UINavigationController     

    public override init() {
        self.navigationController = UINavigationController()
        self.navigationController.view.backgroundColor = .white
        super.init()
    }    

    public var rootViewController: UIViewController {
        return navigationController
    }
}

还有 Coordinator 的基本版本:

public protocol Coordinator: class {    
    var rootViewController: UIViewController { get }    
}

关于ios - 我如何将协调器与 UIITabBarController 一起使用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46492824/