DrawerController 的 iOS 状态恢复问题

Question

我有一个使用 Swift 3.1 编写的应用，使用 Xcode 8.3.3。

我目前正在尝试实施状态保存/恢复。

为此，我在AppDelegate.swift 中实现了shouldSaveApplicationState 和willFinishLaunchingWithOptions 方法并设置为返回true：

// AppDelegate.swift
// STATE RESTORATION CALLBACKS

func application(_ application: UIApplication, shouldSaveApplicationState coder: NSCoder) -> Bool {
    debug_print(this: "shouldSaveApplicationState")
    return true
}
func application(_ application: UIApplication, shouldRestoreApplicationState coder: NSCoder) -> Bool {
    debug_print(this: "shouldRestoreApplicationState")
    restoringState = true
    return true
}

func application(application: UIApplication, willFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {
    debug_print(this: "willFinishLaunchingWithOptions")
    return true
}

我还为所有涉及的视图控制器和导航控制器提供了恢复 ID。

我正在使用第 3 方库来处理侧抽屉导航容器 (https://github.com/sascha/DrawerController)。初始视图控制器在 didFinishLaunchingWithOptions 方法中以编程方式设置，见下文。

// AppDelegate.swift
var centerContainer: DrawerController?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let centerViewController =   mainStoryboard.instantiateViewController(withIdentifier: "RootViewControllerNav") as! UINavigationController 
    let leftViewController = mainStoryboard.instantiateViewController(withIdentifier: "SideDrawerViewController") as! UITableViewController

    centerContainer = DrawerController(centerViewController: centerViewController, leftDrawerViewController: leftViewController)

    centerContainer?.restorationIdentifier = "DrawerControllerView"
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.restorationIdentifier = "MainWindow"
    window?.rootViewController = centerContainer
    window?.makeKeyAndVisible()

    return true
}

当应用程序打开并尝试恢复状态时，它会暂时显示正确的视图控制器（应用程序关闭之前的最后一个控制器），然后一旦应用程序变为活动状态，它就会恢复为初始视图控制器。

例如，会发生以下情况：

1. 打开应用程序通过侧边菜单导航到“设置”视图
2. 导航到主屏幕
3. 停止运行 xcode 并重新启动
4. 应用将打开显示设置视图，然后返回主视图

谁能告诉我是什么原因造成的，或者我哪里出错了？如果您需要更多代码示例，请告诉我。

Answer 1

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let leftSideDrawerViewController = mainStoryboard.instantiateViewController(withIdentifier: "SideDrawerViewController") as! UITableViewController
        let centerViewController = mainStoryboard.instantiateViewController(withIdentifier: "RootViewControllerNav") as! UINavigationController
        let navigationController = UINavigationController(rootViewController: centerViewController)
        navigationController.restorationIdentifier = "navigationControllerKey"
        let leftSideNavController = UINavigationController(rootViewController: leftSideDrawerViewController)
        leftSideNavController.restorationIdentifier = "LeftNavigationController"
        self.drawerController = DrawerController(centerViewController: navigationController, leftDrawerViewController: leftSideNavController, rightDrawerViewController: nil)
        self.drawerController.openDrawerGestureModeMask = .all
        self.drawerController.closeDrawerGestureModeMask = .all
        self.window = UIWindow(frame: UIScreen.main.bounds)
        self.window?.rootViewController = self.drawerController
        return true
    }