Accessing a view controller created through Storyboard using the App Delegate

Question

I\'m working on an iOS5 app using storyboard, and I have a method in a view controller class that i\'d like to access from the App Delegate. The trouble is, this view contr

Answer 1

I have a better solution. You can use window.rootViewController.storyboard to get a reference to the storyboard of that view.

Answer 2

Swift

This is the Swift version of @infiniteLoop's answer.

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let myViewController = storyboard.instantiateViewControllerWithIdentifier("identifier") as! MyViewController

You need to replace the storyboard name, view controller name, and view controller identifier with whatever you used in your project.

Related tasks

• Pass data to the view controller
• Present and dismiss a view controller modally

Answer 3

You'll have to traverse the view hierarchy from the app delegate. Assuming the AppDelegate holds a reference to the UITabBarController, you could use the viewControllers property or selectedViewController property to get to your view controller.

Answer 4

Thanks to Jerry (above), here's the code that got me what I wanted:

    UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
MasterViewController *result;

//check to see if navbar "get" worked
if (navigationController.viewControllers) 

    //look for the nav controller in tab bar views 
    for (UINavigationController *view in navigationController.viewControllers) {

        //when found, do the same thing to find the MasterViewController under the nav controller
        if ([view isKindOfClass:[UINavigationController class]])
            for (UIViewController *view2 in view.viewControllers) 
                if ([view2 isKindOfClass:[MasterViewController class]])                    
                    result = (MasterViewController *) view2;
}

Answer 5

I probably would do it in reverse. Create a method in AppDelegate call registerViewController or something. In every ViewController, call the method with itself with a name. Then in AppDelegate, you can do whatever you want afterward. It is messy to do all sort of drill

In AppDelegate

- (void)registerViewController:(NSString *)name controller:(UIViewController *)controller
{
    if(_viewControllers == nil)
    {
        _viewControllers = [[NSMutableDictionary alloc] init];

    }

    [_viewControllers setObject:controller forKey:name];
}

In any ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    [appDelegate registerViewController:@"feelings" controller:self];
}

In AppDelegate

XViewController *vc = (XViewController *)[_viewControllers objectForKey:@"X"];
[X startSpinner];

Hope this help

BS

Answer 6

In the AppDelegate, you could simply use indexes to access the controllers via UITabBarController:

UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
firstViewController = [[tabBarController viewControllers] objectAtIndex:0];
secondViewController = [[tabBarController viewControllers] objectAtIndex:1];
thirdViewController = [[tabBarController viewControllers] objectAtIndex:2];

Naturally, this will get messed up if you change the ordering of the tab bar. Also, if you're looking for a controller deeper in the hierarchy, you need to do a bit more legwork.