Iphone 如何更改rootviewcontroller

我想在authenticationViewController之后更改rootViewController

-(IBAction)LoginButtonPushed:(id)sender {
    if ([(VerifyId)isEqual:@"C"]){
        CondidatsViewController *condidatsViewController = [[[CondidatsViewController alloc]initWithNibName:@"CondidatsViewController" bundle:nil]autorelease];
        UINavigationController *navController = self.navigationController;

        NSMutableArray *controllers = [[self.navigationController.viewControllers mutableCopy] autorelease];
        [controllers removeLastObject];
        navController.viewControllers = controllers;
        [navController pushViewController:condidatsViewController animated: YES];

    } else {
        RecruteursViewController *recruteursViewController = [[[RecruteursViewController alloc]initWithNibName:@"RecruteursViewController" bundle:nil]autorelease];
        UINavigationController *navController = self.navigationController;

        NSMutableArray *controllers = [[self.navigationController.viewControllers mutableCopy] autorelease];
        [controllers removeLastObject];
        navController.viewControllers = controllers;
        [navController pushViewController:recruteursViewController animated: YES];
    }
}

此代码是当我按下登录按钮时，我希望CondidatsViewController或RecruteursViewController将成为根视图

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    AcceuilViewController *viewController =[[[AcceuilViewController alloc]
                                             initWithNibName:@"AcceuilViewController" bundle:nil]autorelease];
    self.navController = [[[UINavigationController alloc]initWithRootViewController:viewController]
                         autorelease];
   self.window.rootViewController = self.navController;
    [self.window makeKeyAndVisible];
    return YES;
}

---

让视图控制器比导航和身份验证视图控制器高一级怎么样？此视图控制器可以检查有效会话，并将任何适当的视图推送到堆栈顶部。尝试更改根视图控制器似乎是不明智的

编辑：更多详细信息 您有一个根视图控制器，它没有像大多数其他视图控制器那样绑定视图。您将此类设置为应用程序委托中的根视图控制器

App Delegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    
    RootViewController *rootViewController = [[RootViewController alloc] init];
    
    self.window.rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
    
    return YES;
}

在根视图控制器中，您可以确定是否有有效的会话。基于此，可以渲染适当的视图

RootViewController.m

@interface RootViewController ()
@end

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    BOOL isUserAuthenticated = [MyClasskToFigureOutIfUserIsAuthenticated isUserAuthenticated];

    if(isUserAuthenticated == NO) {
        AuthViewController *vcAuth = [[AuthViewController alloc] init];
        [self addChildViewController:vcAuth];
        [self.view addSubView:vcAuth.view];
    } else {
        //they are authenticated so push your other view controller.
    }
}

@end

---

这相当粗糙，但它应该为您指出正确的方向。

在导航和身份验证视图控制器之上设置一个视图控制器怎么样？此视图控制器可以检查有效会话，并将任何适当的视图推送到堆栈顶部。尝试更改根视图控制器似乎是不明智的

编辑：更多详细信息 您有一个根视图控制器，它没有像大多数其他视图控制器那样绑定视图。您将此类设置为应用程序委托中的根视图控制器

App Delegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    
    RootViewController *rootViewController = [[RootViewController alloc] init];
    
    self.window.rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
    
    return YES;
}

在根视图控制器中，您可以确定是否有有效的会话。基于此，可以渲染适当的视图

RootViewController.m

@interface RootViewController ()
@end

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    BOOL isUserAuthenticated = [MyClasskToFigureOutIfUserIsAuthenticated isUserAuthenticated];

    if(isUserAuthenticated == NO) {
        AuthViewController *vcAuth = [[AuthViewController alloc] init];
        [self addChildViewController:vcAuth];
        [self.view addSubView:vcAuth.view];
    } else {
        //they are authenticated so push your other view controller.
    }
}

@end

---

这相当粗糙，但它应该为您指明了正确的方向。

您可以尝试UINavigationController的以下方法，其中包含一组新的所需视图控制器，如

    [self.navigationController setViewControllers:@[newRootViewControllerInstance, secondVCInstanceIfRequired, thirdVC-and-so-on....] animated:NO];

---

它会成功的

您可以使用一个新的所需视图控制器数组来尝试UINavigationController的以下方法，如

    [self.navigationController setViewControllers:@[newRootViewControllerInstance, secondVCInstanceIfRequired, thirdVC-and-so-on....] animated:NO];

---

它会成功的

你能再解释一下吗？你能再解释一下吗？