辞退这是通过presentViewController

Question

装载2的UIViewController当用户点击一个按钮，我显示UIViewController如下：

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视图 - 控制成功加载，用户会点击另一个按钮并显示另一个UIViewcontroller。与前面的代码一样，这也使用presentViewController:。

现在，有2 UIViewController多数民众赞成由presentViewController:显示，

当一个用户点击按钮，我需要这2个ViewControllers解雇。我怎样才能做到这一点 ？

我试过下面的代码，但它没有工作。

[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。关闭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 
    }]; 
}];