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];