Question

当用户点击按钮时，我显示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];

但是，当vc视图控件成功加载时，用户将单击另一个按钮，并显示另一个UIViewcontroller。同样，这也使用了前一代码中的presentViewController:。

现在，UIViewController显示了presentViewController: {/ 1}}，

当用户点击按钮时，我需要这两个ViewControllers来解除。我怎么能这样做？

我尝试了以下代码，但它没有用。

[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。在解除viewControllers时，您可以利用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
    }];
}];

解除通过presentViewController加载的2个UIViewController

1 个答案: