Pass data between ViewController and TabBarController

Question

I have couple of questions. How to pass the data (which i got after the Alamofire request is finished), to one of children of TabBarController?

The first problem i have

Answer 1

change tabbar selected Index & send data to that ViewController

tabBarController!.selectedIndex = 2
let navVC = tabBarController!.viewControllers![2] as! UINavigationController

let SV = navVC.topViewController as! SearchViewController
SV.selectedIndex = indexPath.row