[英]iOS state restoration issue with DrawerController
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
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:
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。
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
}
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