以编程方式更改 UINavigationController 的根控制器

Question

我正在使用情节提要，并将UITabBarController 设置为根控制器。我在标签栏中有 3 个标签项，对于第一个，我有一个 UINavigationController。我希望动态设置此导航控制器的根视图控制器：根据用户提供的参数，我有两个候选视图控制器。

我正在尝试在AppDelegate 中这样做：

UIStoryboard *storyboard = self.window.rootViewController.storyboard;
if (condition1) {
    UINavigationController *navViewController = [storyboard instantiateViewControllerWithIdentifier:@"navController"];
    UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"homeController1"];
    [navViewController setViewControllers:@[viewController]];

} else if (condition2) {
    UINavigationController *navViewController = [storyboard instantiateViewControllerWithIdentifier:@"navController"];
    UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"homeController2"];
    [navViewController setViewControllers:@[viewController]];

但它不起作用。在情节提要中，homeController1 norhomeController2 也没有任何转场。我怎么能这样做？

谢谢

Answer 1

如果我对您的理解正确，您正在尝试根据条件启动不同的视图控制器。您可以在您的应用委托中尝试此操作。

UIStoryboard *storyboard =
  [UIStoryboard storyboardWithName:@"Main" bundle:nil];

if (yourCondition) {
    UIViewController *viewController =
    [storyboard instantiateViewControllerWithIdentifier:@"tutorialView"];
    self.window.rootViewController = viewController;
} else {
    UIViewController *viewController = [storyboard
        instantiateViewControllerWithIdentifier:@"mainViewController"];
    self.window.rootViewController = viewController;
}