CODEWITHSUNDEEP
iostabbar
casillas
casillas

Reputation: 16793

How to know which Tabbar Menu Clicked

I have an UITabBarController which is linked to 5 viewcontrollers as shown in the figure bellow.

In my opening screen, I have register page, if user does not register then I do not want to allow user to see any content of Rewards and Offers ViewController.

Whenever user clicks on tabbarviewcontroller, I would like to generate an UIAlertView that displays either register or cancel.

My question is when the user clicks on the Rewards or Offers, how should I know which tabbar menu clicked to generate UIAlertView ?

I am using storyboard. I have a tabbarcontroller and a custom class of this tabbarcontroller. Header file is as follows:

#import <UIKit/UIKit.h>

@interface MainHarvestGrillTabBarViewController : UITabBarController <UITabBarDelegate>

@end

I would like to know how should I have access which tab is clicked.

I have implemented the following code, but it always return o no matter which tab is clicked.

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
    NSUInteger index = self.tabBarController.selectedIndex;
    NSLog(@"index %lu",(unsigned long)index);
    // Recenter the slider (this application does not accumulate multiple filters)
    // Redraw the view with the new settings
}

enter image description here

Upvotes: 0

Views: 295

Answers (2)

sooper
sooper

Reputation: 6039

You could check which tab was selected using the tab bar's didSelectItem protocol method but this won't prevent the view controller from being displayed. Instead you can make use of the UITabBarControllerDelegate protocol and implement the shouldSelectViewController:(UIViewController *)viewController method. So then you would check the selected view controller and act accordingly. Below is an example for preventing the user selecting the Rewards tab:

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {

    if ([tabBarController.viewControllers objectAtIndex:3] == viewController) {
        UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Alert" message:@"Alert message" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
        [alertView show];
        return NO;

    }
    return YES;
}

You'd place this in your tab bar controller class. You also need to add <UITabBarControllerDelegate> to your header file and set self.delegate = self; in viewDidLoad.

Upvotes: 1

Tommy Devoy
Tommy Devoy

Reputation: 13549

To grab the index of the selected tab item:

NSUInteger index = self.tabBarController.selectedIndex;//The index of the view controller associated with the currently selected tab item.

Or if you would like to grab the actual viewController associated with the selection you could do this:

id yourViewController = [self.tabBarController selectedViewController];//The view controller associated with the currently selected tab item

Upvotes: 1

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