Swift: programmatically enumerate outgoing segues from a UIVIewController

Question

I want to list the outgoing segues from a UIViewController, as described in Programmatically enumerate outgoing Segues for a UIViewController, but in Swift. (Swift 2, Xcode

Answer 1

As per Swift 4.2 and from https://stackoverflow.com/a/35060917/1058199. Thanks /johnykutty.

import UIKit

extension UIViewController {

     // Segue aids in Swift
     @objc func isValidSegue(_ segueId: String?) -> Bool {
        let filteredArray = (value(forKey: "storyboardSegueTemplates") as? NSArray)?.filtered(using: NSPredicate(format: "identifier = %@", segueId ?? ""))
        let isValid = (filteredArray?.count ?? 0) > 0
        return isValid
     }

     @objc func segues() -> Array? {
        let segues = self.value(forKey: "storyboardSegueTemplates")
        return segues as! Array?
     }

    @objc func segueNames() -> Array {
        var segueNames = Array()

        let filteredArray = (value(forKey: "storyboardSegueTemplates") as? NSArray)?.filtered(using: NSPredicate(format: "identifier != nil" ))

        for template in filteredArray! as [AnyObject] {
           if let identifier = (template.value(forKey: "identifier") as? String) {
               segueNames.append(identifier)
            }
            else {
                segueNames.append("no identifier for \(template)")
            }
        }

        return segueNames as! Array
    }
}

I know my use of predicates could be better, but Swift is such a PITA when dealing with iterating arrays. Please feel free to improve this.