Question

是否有方法检索标签栏控制器当前的可见导航控制器？

例如，我的程序中有2个标签栏（每个导航控制器一个），如下所示

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url 
{   
   //Method is called when user clicks on a hyperlink in one of view controllers
    NSDictionary *dict = [self parseQueryString:[url query]];
    NSString *userID = [dict objectForKey:@"id"];
    NSString *navconTitle = [dict objectForKey:@"navcon"];


    //intention is to push a view controller onto the CURRENT navigation stack
    [navcon pushViewController:someViewController animated:YES];

    }
}

return YES;
}

任何人都可以告诉我如何确定当前的导航控制器，以便我可以将更多的视图控制器推到它上面吗？

Answer 1

使用UITabBarControllers selectedViewController属性。

navcon = (UINavigationController*)myTabBarController.selectedViewController;
[navcon pushViewController:someViewController animated:YES];

Answer 2

我认为UITabBarController selectedViewController属性应该是你想要的。

所以，从UITabBarController方法： -

 [self.selectedViewController pushViewController:someViewController animated:YES];

Answer 3

一个Swift版本，以防有人无法阅读Objective-C，并提供了一个附加的解决方案，用于从任何地方查找tabBar。处理通知时，我用它来推送到屏幕。

guard let tabBarVC = UIApplication.shared.keyWindow?.rootViewController as? UITabBarController else { return }

if let currentNavController = tabBarVC.selectedViewController as? UINavigationController {
    currentNavController.pushViewController(someVC, animated: true)
}

Answer 4

将Starsky的Swift答案更新到iOS 13（iOS 13.0中已弃用“ keyWindow”）

guard let tabBarVC = UIApplication.shared.windows.filter({$0.isKeyWindow}).first?.rootViewController as? UITabBarController else { return }
    if let currentNavController = tabBarVC.selectedViewController as? UINavigationController {
...
}

如何从标签栏控制器获取“当前”导航控制器

4 个答案: