ios 如何从标签栏控制器获取“当前”导航控制器
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How to get the 'current' navigation controller from tab bar controller
提问by Zhen
Is there is a method to retrieve tab bar controller's current visible navigation controller?
有没有一种方法可以检索标签栏控制器的当前可见导航控制器？
For example, I have 2 tabbars in my program (one navigation controller each) as below
例如，我的程序中有 2 个标签栏（每个有一个导航控制器），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;
}
Can anyone advise me how I can determine the current navigation controller so that I can push more viewcontrollers onto it?
谁能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？
回答by Joe
Use the UITabBarControllersselectedViewController property.
使用UITabBarController小号selectedViewController财产。
navcon = (UINavigationController*)myTabBarController.selectedViewController;
[navcon pushViewController:someViewController animated:YES];
回答by Adrian B
I think UITabBarController selectedViewControllerproperty should be what you are looking for.
我认为UITabBarController selectedViewController财产应该是你正在寻找的。
So, from a UITabBarController method :-
因此，从 UITabBarController 方法：-
[self.selectedViewController pushViewController:someViewController animated:YES];
回答by Starsky
A Swift version, in case someone can't read Objective-C, with an additional solution for how to find the tabBar from anywhere. I use this to push to a screen when processing a notification.
一个 Swift 版本，以防有人无法阅读 Objective-C，以及如何从任何地方找到 tabBar 的附加解决方案。我在处理通知时使用它来推送到屏幕。
guard let tabBarVC = UIApplication.shared.keyWindow?.rootViewController as? UITabBarController else { return }
if let currentNavController = tabBarVC.selectedViewController as? UINavigationController {
currentNavController.pushViewController(someVC, animated: true)
}
