Launching ViewController from AppDelegate - ios

Question

I have a custom URL scheme and i want to open a certain ViewController which is not the root when i go to this URL. I have been able to do that and what remains is pushing this ViewController into the navigationController from the AppDelegate where i handle my URL like this :
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
if ([[url scheme] isEqualToString:#"njoftime"]) {
NSDictionary *getListingResponse = [[NSDictionary alloc]init];
getListingResponse = [Utils getListing:[url query]];;
if ([[getListingResponse objectForKey:#"status"] isEqualToString:#"success"]) {
ListingViewController *listingView = [[ListingViewController alloc]init];
[self.window.rootViewController.navigationController pushViewController:listingView animated:YES];
return YES;
}
but it only launches my app and not the ListingViewController i want to launch.
Any idea how can i do it differently ?

Answer 1

Issue
To deal with pushing and popping the viewControllers from AppDelegate, you need to use [UIApplication sharedApplication] which keeps track to all of viewControllers, beginning with root one.
Solution
To PUSH ViewController from AppDelegate
ListingViewController *listingVC = [[ListingViewController alloc] init];
[(UINavigationController *)self.window.rootViewController pushViewController:listingVC animated:YES];
To POP that ViewController you just presented, you need to use this code
[(UINavigationController *)[UIApplication sharedApplication].keyWindow.rootViewController popViewControllerAnimated:YES ];

Answer 2

If your using storyboard then you could use below lines for pushing your VC.
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
YOURCLASS *obj=[storyboard instantiateViewControllerWithIdentifier:#"YOUR_CLASS_STORYBOARD_ID"];
[self.window.rootViewController.navigationController pushViewController:obj animated:YES];
Update:-
ListingViewController *listingVC = [[ListingViewController alloc] init];
UINavigationController *navCon = [[UINavigationController alloc] initWithRootViewController:listingVC];
[self.window.rootViewController presentViewController:navCon animated:YES completion:nil];

Answer 3

Write this code in didFinishingWithLaunchingOptions
SecViewController *Vc = [[UIStoryboard storyboardWithName:#"Main" bundle:nil]instantiateViewControllerWithIdentifier:#"second"];
[(UINavigationController *)self.window.rootViewController pushViewController:Vc animated:YES];

Answer 4

For Swift 3 version:
let mainStoryboardIpad : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewControlleripad : UINavigationController = mainStoryboardIpad.instantiateViewController(withIdentifier: "initial") as! UINavigationController
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = initialViewControlleripad
self.window?.makeKeyAndVisible()

Answer 5

If you want to push a UIViewController, you probably are forgetting to init it with the NibName:
LoginViewController *loginViewController = [[LoginViewController alloc]initWithNibName:#"LoginViewController" bundle:nil];

Answer 6

Your AppDelegate.m should look like this:
#import "TestViewController.h"
#interface AppDelegate ()
#property (strong, nonatomic) TestViewController *viewController;
#end
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController = [[TestViewController alloc]init];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}