iphone application for tabbar - iphone

Question

How can I defined and check the alreadySelectedSpecificTab and viewControllerNotToAllow in
my application. anyone give me one example for that.
Actuly I would like to do something. like. When second tab is selected that time if we select second tab is not selected only remaing tab is to be selected.
thats why I used the following code.
please reply
- (BOOL)tabBarController:(UITabBarController *)tabBarControllers shouldSelectViewController:(UIViewController *)viewController
{
if(alreadySelectedSpecificTab)
{
if([viewController isEqual:viewControllerNotToAllow])
return NO;
}
return YES;
}

Answer 1

Create some properties in your class
and keep track of what you want denied and what you dont want denied.
id currentlySelected; //This will hold the address of the selected view
id dontAllowSelection; //This will hold the address of the Denied view
- (BOOL)tabBarController:(UITabBarController *)tabBarControllers shouldSelectViewController:(UIViewController *)viewController
{
if (dontAllowSelection != nil && //If it is nil, we will skip it.
dontAllowSelection == viewController) //If the selected view is Denied return NO
{
return NO;
}
currentlySelected = viewController;
if (currentlySelected == someViewIWantToDisableOtherFor) //Any logic can go here to enable the Denied View.
{
dontAllowSelection = anotherViewIWantDisabled; //Set my denied view.
}
else
{
dontAllowSelection = nil; //Unsed the Denial.
}
return YES;
}