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uitabbar - How to set the Tab bar item 1 to be selected by default in iphone?

I am new to iPhone development. I am creating a view based application. I have added a tab bar in my view (and not a tab bar controller). By setting the tag vale of the tab bar item to 1, 2, I have loaded the view for each tab bar on tabbar item click event.

I want the tab bar 1 to be selected by default. What should I do for that?

Here is my code:

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item {
    NSLog(@"didSelectItem: %d", item.tag);
    [self activateTab:item.tag];
}

- (void)activateTab:(int)index {
    switch (index) {
        case 1:

                self.tab1ViewController =[[tab1 alloc] initWithNibName:@"tab1" bundle:nil];

            [self.view insertSubview:tab1ViewController.view belowSubview:tabbar1];
            if (currentViewController != nil)
                [currentViewController.view removeFromSuperview];
            currentViewController = tab1ViewController; 
            break;
        case 2:

                self.tab2ViewController =[[tab2 alloc] initWithNibName:@"tab2" bundle:nil];
           [self.view insertSubview:tab2ViewController.view belowSubview:tabbar1];
           if (currentViewController != nil)
                [currentViewController.view removeFromSuperview];
            currentViewController = tab2ViewController;         
            break;
        default:
            break;
    }
}

I added the the tab bar in interface builder.Can i do any thing in interface builder?

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[tabBar setSelectedItem:[tabBar.items objectAtIndex:item.tag]];

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