Q:

implementation of tab bar controller

this view present 5 buttons(sorry is in french)

i want to implement a tabbarcontroller when i choose one button , it will navigate to the tabbarControllerClass my problem that i don't know how to program action in every buttton to push to this view 

this is an example of mesAlertbuttonpressed 

-(IBAction)MesAlertsButtonPressed:(id)sender{
TabBarControllerViewController *tabBarControllerViewController = [[TabBarControllerViewController alloc]initWithNibName:@"TabBarControllerViewController" bundle:nil];
tabBarControllerViewController.TypeView=@"Alert";
[self.navigationController pushViewController:tabBarControllerViewController animated:YES];

A:

Create method in AppDelegate.m class and call that method when you want to display tabController For Example:
-(void)setRootViewControllerTab1{

    UIViewController *viewController1, *viewController2, *viewController3, *viewController4, *viewController5;
    UINavigationController *navviewController1 , *navviewController2, *navviewController3, *navviewController4, *navviewController5;

    viewController1 = [[[HomeViewController alloc] initWithNibName:@"HomeViewController" bundle:nil] autorelease];
    navviewController1=[[UINavigationController alloc]initWithRootViewController:viewController1];

    viewController2 = [[[HowItWorksViewController alloc] initWithNibName:@"HowItWorksViewController" bundle:nil] autorelease];
    navviewController2=[[UINavigationController alloc]initWithRootViewController:viewController2];

    viewController3 = [[[JoiniAppointViewController alloc] initWithNibName:@"JoiniAppointViewController" bundle:nil] autorelease];
    navviewController3=[[UINavigationController alloc]initWithRootViewController:viewController3];

    viewController4 = [[[BecomeBussUserViewController alloc] initWithNibName:@"BecomeBussUserViewController" bundle:nil] autorelease];
    navviewController4=[[UINavigationController alloc]initWithRootViewController:viewController4];

    viewController5 = [[[ContactUsViewController alloc] initWithNibName:@"ContactUsViewController" bundle:nil] autorelease];
    navviewController5=[[UINavigationController alloc]initWithRootViewController:viewController5];

    self.tabBarController.viewControllers = [NSArray arrayWithObjects:navviewController1, navviewController2,navviewController3,navviewController4,navviewController5, nil];

    self.window.rootViewController = self.tabBarController;

    [self.window makeKeyAndVisible];
}

and call that method on that button click event like bellow..
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate setRootViewControllerTab1];

