ios 访问模态视图控制器父级

Access modal view controller parent

提问by Nielsou Hacken-Bergen

I'm presenting a ViewController modally. How can I access the parent view controller ?

我正在以模态方式呈现一个 ViewController。如何访问父视图控制器？

My architecture is TabBarController=>VC1=>VC2=>VC3=>MVC1, and I want to reach VC3 from MVC1.

我的架构是TabBarController=>VC1=>VC2=>VC3=>MVC1，我想从MVC1到达VC3。

In VC3, I have this code :

在 VC3 中，我有这个代码：

- (void) editAd{
    AskPasswordViewController *modalViewController = [[AskPasswordViewController alloc] initWithNibName:@"AskPasswordView" bundle:nil];

    NSLog(@"modalparent class=%@", [[modalViewController parentViewController] class]);

    [self presentModalViewController:modalViewController animated:YES];
    [modalViewController release];
}

I tried this in MVC1:

我在 MVC1 中试过这个：

- (void) sendRequest {
    NSLog(@"classe : %@",[[self parentViewController] class] );
}

but it returns my TabBarViewController...

但它返回我的 TabBarViewController ...

采纳答案by justin

The way I'd go about something like this is to simply create a delegate. In AskPasswordViewController's header, put

我要做这样的事情的方法是简单地创建一个委托。在AskPasswordViewController的标题中，放入

id delegate;

and

和

@property (nonatomic, assign) id delegate;

Synthesize it in the implementation file. Then after you alloc/init the modal controller, and before you present it, set modalViewController.delegate = self;. Then within the modal controller, you can call self.delegateto get information from the view controller that presented it. I hope this helps

在实现文件中合成它。然后在你分配/初始化模态控制器之后，在你展示它之前，设置modalViewController.delegate = self;. 然后在模态控制器中，您可以调用self.delegate从呈现它的视图控制器获取信息。我希望这有帮助

回答by Vibhor Goyal

You can access parent by calling:

您可以通过调用访问父级：

self.presentingViewController

As per apple documentation:

根据苹果文档：

The view controller that presented this view controller (or its farthest ancestor.)

呈现此视图控制器（或其最远祖先）的视图控制器。

回答by Cyprian

You can always go further back just by calling parentViewController like so:

你总是可以通过像这样调用 parentViewController 来更进一步：

self.parentViewController.parentViewController.... and so on until you reach the right one.

self.parentViewController.parentViewController.... 依此类推，直到找到合适的为止。

回答by Angela Mao

Addition to Vibhor Goyal - Sometimes, self.presentingViewController registers as NavigationController. Therefore try:

除了 Vibhor Goyal - 有时，self.presentingViewController 注册为 NavigationController。因此尝试：

if let vc = self.presentingViewController.childViewControllers.last as? YourViewController {
// do stuff here
}

回答by Maris

Here I came up with universal method to navigate from any place to root.

在这里，我想出了从任何地方导航到根目录的通用方法。

1. You create a new Class file with this class, so that it's accessible from anywhere in your project:

   import UIKit
   
   class SharedControllers
   {
       static func navigateToRoot(viewController: UIViewController)
       {
           var nc = viewController.navigationController
   
           // If this is a normal view with NavigationController, then we just pop to root.
           if nc != nil
           {
               nc?.popToRootViewControllerAnimated(true)
               return
           }
   
           // Most likely we are in Modal view, so we will need to search for a view with NavigationController.
           let vc = viewController.presentingViewController
   
           if nc == nil
           {
               nc = viewController.presentingViewController?.navigationController
           }
   
           if nc == nil
           {
               nc = viewController.parentViewController?.navigationController
           }
   
           if vc is UINavigationController && nc == nil
           {
               nc = vc as? UINavigationController
           }
   
           if nc != nil
           {
               viewController.dismissViewControllerAnimated(false, completion:
                   {
                       nc?.popToRootViewControllerAnimated(true)
               })
           }
       }
   }
   

2. Usage from anywhere in your project:

   {
       ...
       SharedControllers.navigateToRoot(self)
       ...
   }
   

1. 您使用此类创建一个新的 Class 文件，以便可以从项目中的任何位置访问它：

   import UIKit
   
   class SharedControllers
   {
       static func navigateToRoot(viewController: UIViewController)
       {
           var nc = viewController.navigationController
   
           // If this is a normal view with NavigationController, then we just pop to root.
           if nc != nil
           {
               nc?.popToRootViewControllerAnimated(true)
               return
           }
   
           // Most likely we are in Modal view, so we will need to search for a view with NavigationController.
           let vc = viewController.presentingViewController
   
           if nc == nil
           {
               nc = viewController.presentingViewController?.navigationController
           }
   
           if nc == nil
           {
               nc = viewController.parentViewController?.navigationController
           }
   
           if vc is UINavigationController && nc == nil
           {
               nc = vc as? UINavigationController
           }
   
           if nc != nil
           {
               viewController.dismissViewControllerAnimated(false, completion:
                   {
                       nc?.popToRootViewControllerAnimated(true)
               })
           }
       }
   }
   

2. 在项目中的任何地方使用：

   {
       ...
       SharedControllers.navigateToRoot(self)
       ...
   }
   

回答by Arben Pnishi

//You have to get the root, iterate through the root's ViewControllers and then ask for the ParentViewController.
    UINavigationController ?*root = (UINavigationController*?)[[(AppDelegate*) [[UIApplication sharedApplication]delegate] window] rootViewController];
           for (UIViewController *VC in root.viewControllers) {
               if([VC isKindOfClass:[YourParentViewController class]]){
                   YourParentViewController*  parent = (YourParentViewController*)VC;
                   [parent callMethod]; // your code here
                   [self dismissViewControllerAnimated:YES completion:nil];
               }
           }