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 7, iOS8+).

I can do

override func viewDidLoad() {
    super.viewDidLoad()
    let s = valueForKey("storyboardSegueTemplates")
    print("switchingVC: segues: \(s)") 
}

and that produces output like

switchingVC: segues: Optional((
    "<UIStoryboardPresentationSegueTemplate: 0x1754a130>",
    "<UIStoryboardPresentationSegueTemplate: 0x17534f60>",
    "<UIStoryboardPresentationSegueTemplate: 0x17534fc0>"
))

but I struggle to produce anything after that. I can't find any definition of the UIStoryboardPresentationSegueTemplate. How can I persuade Swift to tell me what's inside it? How can I find the segue identifier?

Thanks!

Answer 1

this valueForKey("storyboardSegueTemplates") is UNDOCUMENTED property and UIStoryboardPresentationSegueTemplate is UNDOCUMENTED class. Beware of rejection from App Store if you are uploading application to App Store.

If you want to use this in your in-house projects, use as following

for template in (valueForKey("storyboardSegueTemplates") as? [AnyObject])! {
    if let identifier = template.valueForKey("identifier") as? String {
        print("identifier - " + identifier)
    }
    else {
        print("no identifier for \(template)")
    }
}

Found from https://github.com/JaviSoto/iOS9-Runtime-Headers/blob/master/Frameworks/UIKit.framework/UIStoryboardSegueTemplate.h