[英]Back button not being called in TabbarCoordinator in horizontal flow iOS 12
協調器模式是一個古老的話題,許多庫試圖解決它,我正在簡單的示例應用程序中學習它。 我當前的設置是 3 個 rootViewControlers: LoadingStateCoordinator
、 WelcomeCoordinator
、 TabBarCoordinator
但缺少 UIKit 和協調器之間的連接。 我正在嘗試使用 UINavigationController 來實現它,但沒有調用該按鈕。 我需要一種連接到后退按鈕的方法和一個可重用的協調器,我可以將其推送到並相應地解除分配(即沒有 RxSwift)。*將歡迎屏幕設置為父/主導航,並且始終能夠返回它。* * 因此,在用戶從顯示的模態視圖(垂直流)中選擇一個表單后,我會在推送時顯示一個 TabBarCoordinator(水平)。 所有的 viewController 都有空的.storyboard
, UIViewController 和 Coordinator 除了 TabBar。這里我只有一個協調器,因為設置了子選項卡協調器,並且需要在后退按鈕點擊時發生魔法。 目前只有當用戶來自 LoadingStateCoordinator 時才會調用它。 在那里我需要將用戶發送回歡迎屏幕,以便他們可以更改入職設置。 這是 LoadingStateCoordinator 的第一個代碼:
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()
}
}
}
這是需要執行返回歡迎屏幕操作的 TabBarCoordinator。 當我展示popToRoot
功能時,它會推送歡迎屏幕,但那里的所有按鈕都被禁用。 我猜是保留周期問題。 我需要另一種設置嗎? 有沒有辦法在這個設置中 popToRoot(vc) ? 我嘗試以運行時錯誤“彈出到非現有控制器”結束。 需要執行此操作的 TabBarCoordinator 代碼:
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
}
}
這是當前的 WelcomeCoordinator 設置
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)
}
}
對不起,我希望有更多的本地方式來做到這一點......
好的,所以我找到了部分解決方案,即我的案例的后退按鈕解決方案:不使用pushViewController
或show
因為它帶有后退按鈕。 presenter.setViewControllers([tabCoordinator.tabBarController!], animated: true)
然后將導航欄設置為隱藏。 我制作了自己的 navItem 按鈕來導航到 rootVC。 下一步分配和刪除所有子 tabBar 協調器識別后點擊。
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