Question

I’m facing this problem for a couple of months and i don’t know what is the best solution to solve it.The problem is,i need to load a XIB before my UITabBar shows up,more clearly,i have my first view which is to the user login(NO TABBAR SHOULD BE DISPLAYED),when user login,the app verify the information and after should load the view with a UITabBarController,but every time i try do that without presenting the login view modally,both of the views are displayed,the login view and the tabbar view.

Answer 1

You could set first the loginViewController as rootViewController of your main window, then after the user is logged in, set the tabBarController as rootViewController.

Something like this (assume your loginViewController is viewController1):

Appdelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    UINavigationController *myNav1=[[UINavigationController alloc] initWithRootViewController:viewController1];
    UINavigationController *myNav2=[[UINavigationController alloc] initWithRootViewController:viewController2];
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:myNav1,myNav2, nil];
    //set the login view
    self.window.rootViewController = viewController1;
    [self.window makeKeyAndVisible];
    return YES;
}

-(void)setTabBar{
    //self.viewController1=nil;
    self.window.rootViewController = self.tabBarController;
}

Then from the loginViewController call the method setTabBar of the appDelegate.

LoginViewController.m
#import "AppDelegate.h"

-(void)loginOK{
   AppDelegate *del=(AppDelegate*)[[UIApplication sharedApplication] delegate];
   [del setTabBar];
   //you could add some animation transition between views
}