How do I access my viewController from my appDelegate? iOS

Question

I have an iOS app I created as a "view-based app" in xCode. I have only one viewController, but it is displayed automatically, and I see no code that ties it to my appDelegate. I need to pass data from my appDelegate to my viewController, but don't know how to pull that off.

My app delegate.h:

#import <UIKit/UIKit.h>   @interface AppDelegate : UIResponder <UIApplicationDelegate>  @property (strong, nonatomic) UIWindow *window; @property (strong, nonatomic) NSDictionary *queryStrings;  @end 

Also, appDidFinishLoadingWithOptions:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     // Override point for customization after application launch.     [[JMC sharedInstance] configureJiraConnect:@"https://cmsmech.atlassian.net/"           projectKey:@"WTUPLOAD" apiKey:@"7fc060e1-a795-4135-89c6-a7e8e64c4b13"];      if ([launchOptions objectForKey:UIApplicationLaunchOptionsURLKey] != nil) {         NSURL *url = [launchOptions objectForKey: UIApplicationLaunchOptionsURLKey];         NSLog(@"url received: %@", url);         NSLog(@"query string: %@", [url query]);         NSLog(@"host: %@", [url host]);         NSLog(@"url path: %@", [url path]);         queryStrings = [self parseQueryString:[url query]];         NSLog(@"query dictionary: %@", queryStrings);     }     else {         queryStrings = [self parseQueryString:@"wtID=nil"];     }      return YES; } 

Answer 1

You can access it with:

MyViewController* mainController = (MyViewController*)  self.window.rootViewController; 

If you are nesting your view behind a tabviewcontroller or navigation controller it will return that to you and you will need to access your view controller inside of it