Question

所以在我的App.Delegate中，我正在这样做 -

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

    self.loginViewController =     [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:[NSBundle mainBundle]];



    UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController: self.loginViewController];
    self.window.rootViewController = navigation;


    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

在我的登录控制器中我正在这样做 -

    - (IBAction)login:(UIButton *)sender {
    NSString *username = self.userName.text;
    NSString *password = self.password.text;

    [AccountUtils emailLogin:username password:password useCookie:true callback:^(NSDictionary *loginResponseJSON){
        if([loginResponseJSON count] != 0){
            [self performSelectorOnMainThread:@selector(displaySearchController) withObject:nil waitUntilDone:YES];
           // [self performSelectorOnMainThread:@selector(switchState) withObject:nil waitUntilDone:YES];
        } else {
        //incorrect entry info view here.

        }

    }];

}

- (void) displaySearchController {
    SearchViewController *searchViewController = [[SearchViewController alloc] initWithNibName:@"SearchView" bundle:[NSBundle mainBundle]];
    UINavigationController *navigator = self.navigationController;
    [navigator popViewControllerAnimated: YES];
    [navigator pushViewController: searchViewController animated:YES];
}

如果我正确登录，我会转到第二个控制器的视图，但在顶部我仍然可以“返回”登录页面。我不希望这种情况发生，我认为这种情况会被popViewControllerAnimated行所关注。我怎么做到这一点，当我登录时，我不允许回到登录页面？（换句话说，我想从导航控制器的堆栈弹出登录控制器？）

Answer 1

如果您只想删除loginVC，可以在用户登录后将新的navigationController设置为AppDelegate的rootViewController。这样您就可以移动displaySearchController中的AppDelegate方法并调用用户登录后的此方法（来自loginVC）：

-(void)displaySearchController{
    SearchViewController *searchViewController = [[SearchViewController alloc] initWithNibName:@"SearchView" bundle:[NSBundle mainBundle]];
    UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController: searchViewController];
    self.window.rootViewController=navigation;
}

否则，如果您真的想要推送动画，可以从SearchDispalyController的viewDidAppear中的navigationController viewControllers堆栈中删除loginVC：

-(void)viewDidAppear:(BOOL)animated{
  NSMutableArray *stackVCs=[self.navigationController.viewControllers mutableCopy];
  int idx=[stackVCs indexOfObject:self];
  //this remove the previous viewcontroller from the stack
  [stackVCs removeObjectAtIndex:idx-1];
  self.navigationController.viewControllers=stackVCs;
  [super viewDidAppear:animated];
}

在推送searchVC之前的loginVC中你应该调用它来隐藏后退按钮：
[navigation.navigationItem setHidesBackButton:YES];

Answer 2

您不希望将UINavigationController与LoginViewController一起使用，并且您不想推送SearchViewController。相反，使用带有SearchViewController的UINavigationController，当你显示它时，将它设为rootViewController。

Answer 3

这样做是为了实现你想要的目标。

将displaySearchController方法移至AppDelegate.m文件
在displaySearchController文件

AppDelegate.h

现在将displaySearchController文件中的AppDelegate.m方法定义为：

- (void) displaySearchController {
    SearchViewController *searchViewController = [[SearchViewController alloc] initWithNibName:@"SearchView" bundle:[NSBundle mainBundle]];
    UINavigationController *navigator = [[UINavigationController alloc]initWithRootViewController:searchViewController];
    self.window.rootViewController = navigator;             
}

从您的showNewViewController调用新的本地方法loginController：

[self performSelectorOnMainThread:@selector(showNewViewController) withObject:nil waitUntilDone:YES];

现在将showNewViewController文件中的loginController.m定义为

-(void)showNewViewController {
    AppDelegate *appDele = [UIApplication sharedApplication].delegate;
    [appDele displaySearchController];
}

不要忘记将AppDelegate.h文件导入loginController.m

这肯定对你有帮助。

登录屏幕和导航控制器

3 个答案: