关闭通过 presentViewController 加载的 2 个 UIViewController

Question

当用户点击按钮时，我会显示UIViewController，如下所示：

NSString * storyboardName = @"Main";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"newviews"];
[self presentViewController:vc animated:YES completion:nil];

然而，当vc viewcontroller 加载成功时，用户将点击另一个按钮并显示另一个UIViewcontroller。同样，这也使用了presentViewController:，就像之前的代码一样。

现在，presentViewController: 正在显示 2 个UIViewController，

当用户点击一个按钮时，我需要这 2 个 ViewController 来关闭。我该怎么做？

我尝试了以下代码，但没有成功。

[self.navigationController popToRootViewControllerAnimated:YES]; 

Answer 1

您需要使用[self.parentViewController dismissViewControllerAnimated:YES]，因为您以模态方式呈现它们。您可以在关闭 viewControllers 时利用 parentViewController 属性。

UIViewController *mainController = [UIViewController new];
UIViewController *vcA = [UIViewController new];
UIViewController *vcB = [UIViewController new];

// User taps button to present vcA
[mainController presentViewController:vcA animated:YES completion:nil];

// User taps button to present vcB
[vcA presentViewController:vcB animated:YES completion:nil];

// Dismiss both vcB and vcA
[vcB.parentViewController dismissViewControllerAnimated:YES completion:^{
    [vcA.parentViewController dismissViewControllerAnimated:YES completion:^{
        // Now you are back on mainController
    }];
}];