Question

...并将其嵌入导航控制器中。

我有一个故事板，我们称之为MainStoryboard。

在主故事板上（也不是initialViewController BTW），我有一个ViewController，我们称之为ViewControllerZ，嵌入在NavigationController中，让我们称之为NavigationControllerZ。

用户点击按钮后......我有......

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
ViewControllerZ *vcZ = (ViewControllerZ *)[storyboard instantiateViewControllerWithIdentifier:@"ViewControllerZ"];
vcZ.delegate = self;
vcZ.blah = blah;
[self.navigationController presentViewController:vcZ animated:YES completion:nil];

然而，这并没有为我提供所需的NavigationController。我需要来自MainStorybard的NavigationController，因为ViewControllerZ上的NavBar有一个UIBarButtonItem取消，以解除模态显示的视图。

所以为了获得我试过的NavigationController ......

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
NavigationViewControllerA *navVcZ = (NavigationViewControllerZ *)[storyboard instantiateViewControllerWithIdentifier:@"NavigationViewControllerZ"];
ViewControllerZ *vcZ  = (ViewControllerZ *)navVcZ.topViewController;
vcZ.delegate = self;
vcZ.blah = blah;
[self.navigationController presentViewController:vcZ animated:YES completion:nil];

然而，由于未捕获的异常＆＃34; NSInvalidArgumentException＆＃39;原因：＆＃39;应用程序尝试以模态方式呈现活动控制器＆＃34;，但这不起作用并引发终止应用程序。

我该如何解决这个问题？

Answer 1

从错误中可以看出，您将navVcZ添加为子视图控制器，如下所示：

[self.navigationController presentViewController:vcZ animated:YES completion:nil];
[self.navigationController addChildViewController:navVcZ];

您可以直接展示navVcZ：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
NavigationViewControllerA *navVcZ = (NavigationViewControllerZ *)[storyboard instantiateViewControllerWithIdentifier:@"NavigationViewControllerZ"];
ViewControllerZ *vcZ  = (ViewControllerZ *)navVcZ.topViewController;
vcZ.delegate = self;
vcZ.blah = blah;
[self.navigationController presentViewController:navVcZ animated:YES completion:nil];

如何在UINavigationController中嵌入的另一个Storyboard上以模态方式呈现UIViewController？

1 个答案: