Question

I tried to present a modal view controller on a view did load.

Here’s the code:

 if (!self.loginNavViewController_){

        AHLoginViewController * loginVC = [[AHLoginViewController alloc] initWithNibName:@"AHLoginViewController" bundle:nil];

        /*
        AHTestViewController * test  = [[AHTestViewController alloc] initWithNibName:@"AHTestViewController" bundle:nil];
        */

        UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:loginVC];
        navController.modalPresentationStyle = UIModalPresentationFullScreen;
        navController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        navController.title = @"Login to Instagram";

        self.loginNavViewController_ = navController;
        [self presentModalViewController:self.loginNavViewController_ animated:YES];


        if (self.loginNavViewController_ == nil){
            NSLog(@"NIL");
        } else {
            NSLog(@"NOT NIL");
        }

}

However I don’t see a modal view controller being shown. Why??

Answer 1

A view controller receives viewDidLoad immediately after loading the view and before the view is inserted into a view hierarchy. In other words, it cannot present a modal view controller because its own view is not in any window yet.

Try to do that in viewWillAppear: or viewDidAppear: instead.