如何使用 tabbarcontroller 在应用程序加载时分隔视图控制器
我使用 tabbarcontroller 作为根视图控制器。不幸的是，使用新的故事板功能，事实证明很难在应用程序负载上连接视图控制器 - 登录页面。
我正在使用下面的代码：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
[tabBarController performSegueWithIdentifier:@"loginPage" sender:self];
Segue 设置正确。我进入其中一个选项卡视图控制器并创建了一个 IBAction，它成功地进行了连接。 提前致谢。
I am using a tabbarcontroller as the root view controller. Unfortunately, using the new storyboard functionality, it is proving difficult to segue a view controller - Login Page - on the app load.
I am using the below code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
[tabBarController performSegueWithIdentifier:@"loginPage" sender:self];
The segue is set up properly. I went into one of the tabs view controllers and made an IBAction and it successfully segued.
Thanks in advance.
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今天遇到了同样的问题。我必须
先
调用：所以我假设使用故事板时 makeKeyAndVisible 发生在 didFinishLaunchinWithOptions: 返回之后。因此，当我们调用 Segue 时，它发生在屏幕上以外的视图上。
Ran into this same issue today. I had to call:
before
So I'm assuming that when using storyboards the makeKeyAndVisible happens after didFinishLaunchinWithOptions: returns. So when were calling the segue its happening on a view thats not onscreen.
我最近遇到了同样的问题。但是，提供的解决方案对我来说并不奏效。
原因是我使用“推”segue 来显示我的登录视图控制器（嵌入在导航控制器中）。将 Segue 的风格从“push”更改为“modal”对我来说很有效。显然，不可能从选项卡栏控制器内启动“推送”segue，而只能从导航控制器内启动。
此外，我没有将该行
放在应用程序委托的方法
didFinishLaunchingWithOptions:didFinishLaunchingWithOptions:中，而是放在方法viewDidAppear:中。这样做，我不需要以下代码行：希望这对其他人有用。
I ran recently into the same issue. However, the solution provided did not work out for me.
The reason was that I used a "push" segue to display my login view controller (which was embedded inside a navigation controller). Changing the style of the segue from "push" to "modal" did the trick for me. Apparently, it is not possible to initiate a "push" segue from within a tab bar controller but only from within a navigation controller.
Furthermore, I did not put the line
in the method
didFinishLaunchingWithOptions:didFinishLaunchingWithOptions:of the app's delegate, but rather in the methodviewDidAppear:. Doing so, I did not need the following line of code:Hope this is useful to others.