iPhone refresh AppDelegate - iphone

Question

Ok I have an application that uses tab controller. However before I want the tab controller to load up, I want the user to enter a screen which allows them to enter their phone number first as I need to save the users phone number for use in the application. I save the number to the application like this.
[[NSUserDefaults standardUserDefaults] setInteger:1234 forKey:#"PhoneNumber"];
Basically when they first enter application, a window will open which will allow them to store enter their number in text field and it saved using the NSuserDefaults.
In the appDelegate, I have an if statement to check if a value is stored or not like this
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
NSInteger phoneNumber=[[NSUserDefaults standardUserDefaults] integerForKey:#"PhoneNumber"];
if(phoneNumber == 0){
//So this is the window which allow them to enter their phone number
UIViewController *phoneNumberVC = [[PhoneNumberVC alloc] initWithNibName:#"PhoneNumber" bundle:nil];
UIViewController *phoneNumberRootVC = [[UINavigationController alloc] initWithRootViewController:phoneNumberVC];
self.window.rootViewController = phoneNumberRootVC;
[self.window makeKeyAndVisible];
}else{
//Code here sets up tab controller and all the tabs etc
}
}
Now the code works fine, except for the fact that after the number is saved, I have to exit the simulator, and run it again, and then the tab screens appear. However, I want the tab controller to load up a soon as the user has pressed the button in the phone number screen to save the number. Current method in the phone number screen is this:
-(IBAction)testing{
NSString *st = [phoneTF text];
NSInteger pn = [st intValue];
NSString *display = [NSString stringWithFormat:#"%i", pn];
[[NSUserDefaults standardUserDefaults] setInteger:pn forKey:#"PhoneNumber"];
UIAlertView * alert = [[UIAlertView alloc] initWithTitle:#"Warning"
message:display
delegate:self
cancelButtonTitle:#"Okay"
otherButtonTitles:nil];
[alert show];
}
The alert is just for testing purposes. So after the button is pressed, I want the tab controller to load up in the app delegate. Is there anyway I can refresh the application or the app delegate?
Would be very grateful if someone could point me in the right direction!!!
EDIT
Tried
[self.navigationController pushViewController:app.tabBarController animated:YES];
But as the tabBarController is not initialised yet, it won't run
Console error
Application tried to push a nil view controller on target <UINavigationController: 0x8056d40>.
So I need to run the AppDelegate again, so the tab controller and all its views will be initialised

Answer 1

replace
UIAlertView * alert = [[UIAlertView alloc] initWithTitle:#"Warning" message:display
delegate:self cancelButtonTitle:#"Okay" otherButtonTitles: nil];
[alert show];
with code that asks the navigation controller to switch to the other view you want:
YourOtherViewController *yourOtherViewController = [[YourOtherViewController alloc] init];
[self.navigationController pushViewController:yourOtherViewController animated:YES];
Edit
If you want to access the AppDelegate from phoneNumberVC, you can do something like the following:
if(phoneNumber == 0){
UIViewController *phoneNumberVC = [[PhoneNumberVC alloc] initWithNibName:#"PhoneNumber" bundle:nil];
phoneNumberVC.appDelegate = self; // add this property to PhoneNumberVC
UIViewController *phoneNumberRootVC = [[UINavigationController alloc] initWithRootViewController:phoneNumberVC];
self.window.rootViewController = phoneNumberRootVC;
} else {
[self setUpTabViewController]; // add this function
}
[self.window makeKeyAndVisible];
And in PhoneNumberVC something like:
[self.appDelegate setUpTabViewController];