iOS: On 'Automatic TabBar switched' method

Question

I'm trying to switch tabs programmatically and ensure that on switch the respective Navigation Controller pops to the root view controller. Is there a method that is invoked when tab bar is switched manually or programmatically?

Note: -(void)tabBarController:didSelectViewController: is only invoked on manual switching of the tab bars

how are you switching the tabBar programmatically? – KDaker Aug 21 '12 at 18:46 — KDaker, Aug 21 '12 at 18:46
```[self.tabBarController setSelectedIndex:kSomeTab];``` – Nav Aug 21 '12 at 18:48 — Nav, Aug 21 '12 at 18:48

score 1 · Accepted Answer · edited May 23 '17 at 10:24

1

You could try also calling didSelectViewController programmatically. Check out babbidi's answer here:

How to trigger method "tabBarController:didSelectViewController:" programmatically?

edited May 23 '17 at 10:24

Community

1
1

answered Aug 21 '12 at 18:52

Derek

132
1
5

Thanks. should've thought of this. – Nav Aug 21 '12 at 19:39

score 0 · Answer 2 · edited May 23 '17 at 12:18

FWIW, the other way of doing this is using an observer on selectedViewController.

// Add Observer
// Note: tabBarController.selectedIndex is not observed as it does not call observeValueForKeyPath on manual switch
[self.tabBarController addObserver:self forKeyPath:@"selectedViewController" options:NSKeyValueObservingOptionNew context:@"changedTabbarIndex"];

// Method for Handling Observations
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    NSString *action = (__bridge NSString*)context;
    if([action isEqualToString:@"changedTabbarIndex"])
    {
        // Stuff to do on selected Tab changed
    }
}

// Change selectedViewController
[self.tabBarController setSelectedViewController:[[self.tabBarController viewControllers] objectAtIndex:kSomeTab]];

More Info: I didn't get any notifications when I touched on tabbar items

iOS: On 'Automatic TabBar switched' method

2 Answers2