Question

i have a tabBarController application and using .xib files for the interface not the storyboard
i have this code by default in the appdelegate

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[PopAdsFirstViewController alloc] initWithNibName:@"PopAdsFirstViewController" bundle:nil];

UIViewController *viewController2 = [[PopAdsSecondViewController alloc] initWithNibName:@"PopAdsSecondViewController" bundle:nil];

self.tabBarController = [[UITabBarController alloc] init];

self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, nil];

self.window.rootViewController = self.tabBarController;

[self.window makeKeyAndVisible];

return YES;

i have created a Login View and don’t know how to show it before the tabBarView and hide t after a successful login.

Answer 1

One way would be to show it as a modalView on launch. Dismissing upon successfull login?
eg:

UIViewController myLoginViewController = [[MyLoginViewController alloc] init withNibNamed:"MyLoginViewController"]; //Or whatever you instantiation is
[myTabViewController presentModalViewController:myLoginViewController animated:YES];

And to dismiss it (Hide it)

//This should be done from the original View Controller i.e. myTabViewController preferably in a delegate called by the modal view controller.
[self dismissModalViewControllerAnimated:YES];

Documentation on modalViewControllers:
http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/ModalViewControllers/ModalViewControllers.html