ios - Prevent user from entering UITabBarController with login -

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i have login view leads uitabbarcontroller 4 tabs. want when password empty or wrong user prompted stay in same view (the login view) , not tab bar controller. in other words want able view tab bar if password ok (non-empty , correct). possible keep showing login view until provided password correct? ideas?

as understand want disable tabbar on time.

if use uitabbarcontroller can use 

- (bool)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller shouldselectviewcontroller:(uiviewcontroller *)viewcontroller {     return no;  }

or can disable userinteractionenabled

mytabbar.userinteractionenabled = no;

you can add subview uitabbarcontroller example fade out tabbar

uiview *view = [[uiview alloc] initwithframe:self.view.bounds]; view.backgroundcolor = [uicolor blackcolor]; view.alpha = 0.3f; [self.tabbarcontroller.view addsubview:view]; [view release];

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