CODEWITHSUNDEEP
iphoneios
Nielsou Hacken-Bergen
Nielsou Hacken-Bergen

Reputation: 2626

Access modal view controller parent

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

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

In VC3, I have this code : 

- (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:

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

but it returns my TabBarViewController...

Upvotes: 31

Views: 33896

Answers (7)

algrid
algrid

Reputation: 5954

If presentingViewController gives you unexpected results and you don't want to fiddle with it, just do:

class MyViewController: UIViewController {

    private weak var presenter: UIViewController?

    init(presenter: UIViewController) {
        self.presenter = presenter
        super.init(nibName: nil, bundle: nil)
        ...
    }
    
    ...
}

Upvotes: 0

Angela Mao
Angela Mao

Reputation: 71

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

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

Upvotes: 7

Maris
Maris

Reputation: 684

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

  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)
    ...
}

Upvotes: 1

Arben Pnishi
Arben Pnishi

Reputation: 591

//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];
               }
           }

Upvotes: 0

Vibhor Goyal
Vibhor Goyal

Reputation: 2425

You can access parent by calling:

self.presentingViewController

As per apple documentation:

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

Upvotes: 99

justin
justin

Reputation: 5831

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

id delegate;

and 

@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.delegate to get information from the view controller that presented it. I hope this helps

Upvotes: 25

Cyprian
Cyprian

Reputation: 9453

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

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

Upvotes: 7

Related Questions