ios - 以编程方式初始化导航 Controller 堆栈

Question

这是按下按钮的代码:

- (IBAction)newPoint:(id)sender {
    [self.tabBarController setSelectedIndex:1];

    UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"navid"];
    UIViewController *tblvc = [self.storyboard instantiateViewControllerWithIdentifier:@"tblid"];

    UINavigationController *nvc1 = self.tabBarController.viewControllers[1];
    [nvc1 pushViewController:tblvc animated:NO];
    [nvc1 pushViewController:vc animated:NO];
}

这是我的 Storyboard

这是我得到的异常:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Pushing a navigation controller is not supported'

我想要实现的是在点击按钮时显示最右边的 View Controller (在 Storyboard中)。然后我希望导航 Controller 的后退按钮转到 Root View Controller ，就像我手动到达该 Controller 一样。

为此，我更改为第二个选项卡(因为按钮位于第一个选项卡上)，然后尝试初始化导航 Controller 。但我可能缺少一些东西......

Answer 1

确保您在 Storyboard内的正确 View Controller 上设置了 Storyboard ID。对我来说，它看起来像是

UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"navid"];

或者

UIViewController *tblvc = [self.storyboard instantiateViewControllerWithIdentifier:@"tblid"];

正在创建 UINavigation Controller 的新实例。您可以使用以下内容来确认这一点

    - (IBAction)newPoint:(id)sender {
        [self.tabBarController setSelectedIndex:1];

        UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"navid"];
        UIViewController *tblvc = [self.storyboard instantiateViewControllerWithIdentifier:@"tblid"];

        NSLog(@"vc - %@",NSStringFromClass([vc class]));
        NSLog(@"tblvc - %@",NSStringFromClass([tblvc class]));

        UINavigationController *nvc1 = self.tabBarController.viewControllers[1];
        [nvc1 pushViewController:tblvc animated:NO];
        [nvc1 pushViewController:vc animated:NO];
    }

然后在调试器中检查类名。 UINavigationController (或子类)中的任何一个都是问题所在。