How do I set the default tab for tab bar controller in swift

Question

I'm new to Swift, and about a 5 out of 10 on the Objective-C knowledge scale..

I created a basic three tab Swift application. Each tab has an associated swift class file, e.g. FirstViewController.swift , SecondViewController.swift, ThirdViewController.swift.

When I select the third tab, I now open the application preference settings using a viewDidAppear function override in ThirdViewController.swift, e.g.:

override func viewDidAppear(animated: Bool) {
    // open app preference s
    if let url = NSURL(string:UIApplicationOpenSettingsURLString) {
        UIApplication.sharedApplication().openURL(url)
    }
}

Though, prior to opening the preferences, I would like to set the active tab back to the first tab. How is this done elegantly in Swift.

The following does not work:

self.tabBarController.selectedIndex = 0

As the UIViewController of the ThirdViewController class does not have a tabBarController.

Brian.

Answer 1

User Omkar responded above with the correct answer. I can successfully switch the first tab using the following viewDidAppear in ThirdViewController.swft

override func viewDidAppear(animated: Bool) {         
    self.tabBarController?.selectedIndex = 0     
}