Five Signs of Code Smell in Swift - 1

five-signs-of-code-smell-in-swift-1.swift

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == viewController {
        let navigationController = segue.destinationViewController as! UINavigationController
        let addViewController = navigationController.viewControllers.first as! AddViewController
        addViewController.delegate = self
    }
}