Passing Data between View Controllers without segue [duplicate]

Answer 1

One way is to use the navigational heiarchy to access the view controller.

From the viewController that you want to pass data it's tabBarController property should be the same instance of the tab bar that VC2 is a part of

func setStringForVC2(stringToSet:String) {
    guard let myTabBarController = tabBarController, let tabBarViewControllers = myTabBarController.viewControllers else {
        return
    }

    //need to access index 1 since vc's are stored in tabbarcontroller starting with 0, so 1 to access 2nd vc.
    if (tabBarViewControllers.indices.contains(1)) {
        if let vc2 = tabBarViewControllers[1] as? VC2Class {
            vc2.stringIWantToSet = stringToSet
        }
    }
}