Question

So I have 2 tabs in my tab bar controller.

I have a button in Tab 2, and if I click that, control needs to be passed to Tab 1, and it should become the present view controller.

//I should not use navigation for this because the view would navigate
the present view to the view in tab 1 ; but the tab will still indicate Tab 2//

I just need it to go to tab 1 when I click the button.

Answer 1

When you click the button, just have it send the following

self.tabBarController.selectedIndex = 0;

That will tell it to switch to the first tab in its index (Tab 1)

If you want to add animation to the change, you’ll use transitionFromView:toView:duration:options:completion:. And to implement this, you’ll use something like this:

[UIView transitionFromView:self.view 
    toView:[[self.tabBarController.viewControllers objectAtIndex:0] view] 
    duration:1 /*or whatever time you want*/ 
    options:/*specify your animation transition here, they are found in the UIView documentation*/ 
    completion:(void (^)(BOOL finished))completion:^(BOOL finished) {
        if (finished) {
            tabBarController.selectedIndex = 0;
        }
    }];

The options give you control how it transitions, and there’s a nice list of all the stuff you can do. Then the completion block lets you specify what to do once you’re finished. In this case, it will switch to tab 1 so it is the new primary controller