我有一个使用
Xcode 8.3.3在
Swift 3.1中编写的应用程序.
我目前正在尝试实施国家保护/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
}
我还为所有相关的viewcontrollers和navigationcontrollers提供了恢复ID.
我正在使用第三方库来处理侧抽屉导航容器(https://github.com/sascha/DrawerController).初始viewcontroller是在didFinishLaunchingWithOptions方法中以编程方式设置的,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viewcontroller(应用程序关闭前的最后一个控制器),然后一旦应用程序变为活动状态,它将恢复为初始viewcontroller.
例如,发生以下情况：
>打开应用程序通过侧面菜单导航到“设置”视图
>导航到主屏幕
>停止运行xcode并再次启动它
>应用程序将打开显示设置视图,然后恢复为主视图
任何人都可以告诉我是什么导致了这个,或者我哪里出错了？如果您需要更多代码示例,请与我们联系.
解决方法
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
}
