我有一個故事板設置了正常的登錄名和主視圖控制器，主視圖控制器是登錄成功后用戶導航到的視圖控制器。我的目標是如果身份驗證（存儲在鑰匙串中）成功，則立即顯示主視圖控制器，如果身份驗證失敗，則顯示登錄視圖控制器?；旧?，我想在AppDelegate中執行以下操作：// url request & response work fine, assume success is a BOOL here// that indicates whether login was successful or notif (success) { // 'push' main view controller} else { // 'push' login view controller}我知道方法performSegueWithIdentifier：但是該方法是UIViewController的實例方法，因此無法從AppDelegate中調用。如何使用現有的情節提要板來完成此任務？編輯：情節提要的初始視圖控制器現在是導航控制器，沒有連接任何東西。我使用了setRootViewController：區別，因為MainIdentifier是UITabBarController。這就是我的代碼：- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ BOOL isLoggedIn = ...; // got from server response NSString *segueId = isLoggedIn ? @"MainIdentifier" : @"LoginIdentifier"; UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil]; UIViewController *initViewController = [storyboard instantiateViewControllerWithIdentifier:segueId]; if (isLoggedIn) { [self.window setRootViewController:initViewController]; } else { [(UINavigationController *)self.window.rootViewController pushViewController:initViewController animated:NO]; } return YES;}歡迎提出建議/改進！
3 回答
子衿沉夜
TA貢獻1828條經驗 獲得超3個贊
我假設您的情節提要板被設置為“主情節提要板”（UIMainStoryboardFileInfo.plist中的鍵）。在這種情況下，UIKit將加載情節提要，并將其初始視圖控制器設置為窗口的根視圖控制器，然后再發送application:didFinishLaunchingWithOptions:到AppDelegate。
我還假設情節提要中的初始視圖控制器是導航控制器，您要將主視圖或登錄視圖控制器推入該導航控制器。
您可以向窗口詢問其根視圖控制器，并將performSegueWithIdentifier:sender:消息發送給它：
NSString *segueId = success ? @"pushMain" : @"pushLogin";
[self.window.rootViewController performSegueWithIdentifier:segueId sender:self];
絕地無雙
TA貢獻1946條經驗 獲得超4個贊
我對這里提出的一些解決方案感到驚訝。
故事板中實際上不需要虛擬的導航控制器，無需在viewDidAppear：或任何其他黑客上隱藏視圖并觸發segues。
如果沒有在plist文件中配置情節提要，則必須自己創建窗口和根視圖控制器：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
BOOL isLoggedIn = ...; // from your server response
NSString *storyboardId = isLoggedIn ? @"MainIdentifier" : @"LoginIdentifier";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil];
UIViewController *initViewController = [storyboard instantiateViewControllerWithIdentifier:storyboardId];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = initViewController;
[self.window makeKeyAndVisible];
return YES;
}
如果在應用程序的plist中配置了故事板，則在調用application：didFinishLaunching：時將已經設置了窗口和根視圖控制器，并且將在窗口上為您調用makeKeyAndVisible。
在這種情況下，它甚至更簡單：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
BOOL isLoggedIn = ...; // from your server response
NSString *storyboardId = isLoggedIn ? @"MainIdentifier" : @"LoginIdentifier";
self.window.rootViewController = [self.window.rootViewController.storyboard instantiateViewControllerWithIdentifier:storyboardId];
return YES;
}
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
如果您的情節提要的入口點不是UINavigationController：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//Your View Controller Identifiers defined in Interface Builder
NSString *firstViewControllerIdentifier = @"LoginViewController";
NSString *secondViewControllerIdentifier = @"MainMenuViewController";
//check if the key exists and its value
BOOL appHasLaunchedOnce = [[NSUserDefaults standardUserDefaults] boolForKey:@"appHasLaunchedOnce"];
//if the key doesn't exist or its value is NO
if (!appHasLaunchedOnce) {
//set its value to YES
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"appHasLaunchedOnce"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
//check which view controller identifier should be used
NSString *viewControllerIdentifier = appHasLaunchedOnce ? secondViewControllerIdentifier : firstViewControllerIdentifier;
//IF THE STORYBOARD EXISTS IN YOUR INFO.PLIST FILE AND YOU USE A SINGLE STORYBOARD
UIStoryboard *storyboard = self.window.rootViewController.storyboard;
//IF THE STORYBOARD DOESN'T EXIST IN YOUR INFO.PLIST FILE OR IF YOU USE MULTIPLE STORYBOARDS
//UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"YOUR_STORYBOARD_FILE_NAME" bundle:nil];
//instantiate the view controller
UIViewController *presentedViewController = [storyboard instantiateViewControllerWithIdentifier:viewControllerIdentifier];
//IF YOU DON'T USE A NAVIGATION CONTROLLER:
[self.window setRootViewController:presentedViewController];
return YES;
}
如果您的情節提要的入口點是UINavigationController替換項：
//IF YOU DON'T USE A NAVIGATION CONTROLLER:
[self.window setRootViewController:presentedViewController];
與：
//IF YOU USE A NAVIGATION CONTROLLER AS THE ENTRY POINT IN YOUR STORYBOARD:
UINavigationController *navController = (UINavigationController *)self.window.rootViewController;
[navController pushViewController:presentedViewController animated:NO];
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