ios - Swift tab bar view prepareforsegue

Question

In VC1 (collection view) this is my prepareforsegue code:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let segue = segue.destinationViewController as TabBarViewController


    var selectedIndex = self.collectionView.indexPathForCell(sender as UICollectionViewCell)

    segue.selectedIndexPassing = selectedIndex?.row

}

When I get to VC2 (which is TabBarViewController), I println() selectedIndexPassing to see what returns. It returns correctly. And then, in VC2, I call this prepareforsegue to get to the actual view controller, or the first button in the tab bar:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var segue = segue.destinationViewController as PlayerFromRosterViewController
    segue.selectedIndexPassingForDisplay = 1
}

However, when I println() the selectedIndexPassingForDisplay in VC3 (PlayerFromRosterViewController) I get nil. Why isn't the variable passing from the Tab Bar navigation controller to VC3, AKA the first tab bar button view.

Answer 1

Have you checked whether the prepareForSegue in your TabBarController ever gets called?

It would never be called since the connection between a UITabBarController and its children view controllers isn't a storyboard segue. You should get a reference directly to the viewController from the UITabBarController by accessing its viewControllers collection at the index you want.

var tabBarController = segue.destination as UITabBarController
var destinationViewController = tabBarController.viewControllers[0] as YourViewController // or whatever tab index you're trying to access
destination.property = "some value"