协调器模式是一个古老的话题，许多图书馆都试图解决它，我正在简单的示例应用程序中学习它。我当前的设置是 3 rootViewControlers: LoadingStateCoordinator, WelcomeCoordinator，TabBarCoordinator但 UIKit 和协调器之间缺少连接。我正在尝试使用 UINavigationController 来实现它，但没有调用该按钮。我需要一种连接到后退按钮的方法和一个可重用的协调器，我可以相应地推送和取消定位（即没有 RxSwift）。*将欢迎屏幕设置为父/主导航并始终能够返回到它。* * 因此，在用户从模态视图（垂直流）中选择一个表单后，我会在推送时显示一个 TabBarCoordinator（水平）。所有的 viewController 都是空的.storyboard, UIViewController 和 Coordinator exept TabBar.Here 我只有一个协调器，因为设置了子选项卡协调器，魔术需要在后退按钮点击时发生。目前只有当用户来自 LoadingStateCoordinator 时才会调用它。在那里，我需要将用户送回欢迎屏幕，以便他们可以更改入职设置。这是 LoadingStateCoordinator 的第一个代码：
final class LoadingStateCoordinator: NSObject, Coordinator {
*// MARK: - Inputs required*
var childCoordinators: [Coordinator]
var presenter: UINavigationController
private let window: UIWindow
*// MARK: - Initialization*
init(window: UIWindow) {
self.window = window
childCoordinators = []
presenter = UINavigationController()
}
*// MARK: - Coordinator*
func start() {
let controller: LoadingStateViewController = LoadingStateViewController.instantiate()
window.rootViewController = controller
controller.delegate = self
}
}
*// MARK: - LoadingViewControllerDelegate*
extension LoadingStateCoordinator : LoadingViewControllerDelegate {
func performScreenSwitch() {
if UserDefaults.standard.userWasHere == false {
let tabCoordinator: TabBarCoordinator = TabBarCoordinator(window: window, tabBarController: UITabBarController())
window.rootViewController = presenter
addChildCoordinator(tabCoordinator)
tabCoordinator.start()
presenter.pushViewController(tabCoordinator.tabBarController!, animated: true)
} else {
let welcomeCoordinator = WelcomeCoordinator(window: window, presenter: presenter)
window.rootViewController = welcomeCoordinator.presenter
addChildCoordinator(welcomeCoordinator)
welcomeCoordinator.start()
}
}
}
这是需要执行返回欢迎屏幕操作的 TabBarCoordinator。当我展示popToRoot功能时，它会推动欢迎屏幕，但那里的所有按钮都已禁用。我想是保留周期问题。我需要 funadametally 另一个设置吗？在这个设置中有没有办法 popToRoot(vc) ？我尝试以运行时错误“弹出到不存在的控制器”结束。需要执行此操作的 TabBarCoordinator 代码：
final class TabBarCoordinator: NSObject, Coordinator {
internal var presenter: UINavigationController
internal var tabBarController: UITabBarController?
internal var childCoordinators: [Coordinator]
var parentCoordinator: LoadingStateCoordinator?
lazy var leftBtn: UIBarButtonItem = {
let button = UIButton(type: .system)
button.setImage(UIImage(systemName: "arrow.turn.up.left"), for: .normal)
button.sizeToFit()
button.addTarget(self,
action: #selector(self.popToRoot(_:)),
for: .touchUpInside)
return UIBarButtonItem(customView: button)
}()
init(window: UIWindow, tabBarController: UITabBarController) {
self.tabBarController = tabBarController
childCoordinators = []
self.presenter = UINavigationController()
}
func start() {
performGetTabBar()
self.presenter.delegate = self
}
private func performGetTabBar() {
let coordinators: [Coordinator] = generateTabCoordinators()
coordinators.forEach({ coordinator in
coordinator.start()
addChildCoordinator(coordinator)
})
let presenters: [UIViewController] = coordinators.map({ coordinator -> UIViewController in
return coordinator.presenter
})
leftBtn.style = .plain
tabBarController?.navigationItem.leftBarButtonItem = leftBtn
tabBarController?.setViewControllers(presenters, animated: false)
selectTab(type: SurfTripCoordinator.self)
}
private func generateTabCoordinators() -> [Coordinator] {
let calculatorCoordinator: CalculatorCoordinator = CalculatorCoordinator(presenter: UINavigationController())
let tripCoordinator: SurfTripCoordinator = SurfTripCoordinator(presenter: UINavigationController())
let sellCoordinator: SavedTripsCoordinator = SavedTripsCoordinator(presenter: UINavigationController())
return [calculatorCoordinator, tripCoordinator, sellCoordinator]
}
*//this is not being called when coming from vertical flow*
@objc func popToRoot(_ sender: UIBarButtonItem) {
let storyboard: UIStoryboard = UIStoryboard(name: Constants.Storyboards.welcomeViewCoordinator, bundle: nil)
let controller: WelcomeViewController = WelcomeViewController.instantiate(from: storyboard)
tabBarController?.navigationController?.pushViewController(controller, animated: true)
}
}
extension TabBarCoordinator: UINavigationControllerDelegate {
func selectTab<T: Coordinator>(type _: T.Type) {
guard let index = childCoordinators.firstIndex(where: { coordinator in
coordinator is T
}) else {
return
}
tabBarController?.selectedIndex = index
}
}
这是当前设置的 WelcomeCoordinator
class WelcomeCoordinator: NSObject, Coordinator {
internal var presenter: UINavigationController
var childCoordinators: [Coordinator]
init(window: UIWindow, presenter: UINavigationController) {
self.presenter = presenter
childCoordinators = []
}
func start() {
let storyboard: UIStoryboard = UIStoryboard(name: Constants.Storyboards.welcomeViewCoordinator, bundle: nil)
let controller: WelcomeViewController = WelcomeViewController.instantiate(from: storyboard)
controller.delegate = self
presenter.pushViewController(controller, animated: true)
}
}
extension WelcomeCoordinator : WelcomeViewControllerDelegate {
func performAddLevel() {
let addLevelCoordinator: AddLevelViewCoordinator = AddLevelViewCoordinator(presenter: UINavigationController())
addLevelCoordinator.start()
addChildCoordinator(addLevelCoordinator)
addLevelCoordinator.presenter.modalPresentationStyle = .fullScreen
presenter.present(addLevelCoordinator.presenter, animated: true, completion: nil)
}
}
对不起，我希望有更多的本地方式来做到这一点......