Member Avatar for silent lover

dear all daniweb users,
i start using xamarin to create ios software.
in mainstoryboard, i navigate passcodevc view controller to songlistvc view controller.
i use scandit barcode scanner script in passcodevc.cs .
after barcode scanner script, i want navigate from passcodevc view controller to songlistvc view controller. i use this code and did not auto navigate :

var storyBoard = UIStoryboard.FromName ("MainStoryboard", null);
storyBoard.InstantiateViewController ("SongListVC");

try this one too but also not auto navigate :

PasscodeVCViewController *viewController = segue.SongListVCViewController;
viewController.delegate = self;

both code tried but did not work.
i know it it easier use button to create push seque to songlistvc view controller, but i did not want it.
what i want is auto redirect after scandit barcode scanner code(in passcodevc.cs and passcodevc view controller) to songlistvs view controller.
how to did that without push button?
please help me.

regards.

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  • Latest Post Latest Post by Michael_31

Dani AI

Generated

tried instantiating the view controller but never actually performed a visible transition. Instantiating a UIViewController just creates an object — it must be pushed onto a UINavigationController, presented modally, or shown via a storyboard segue. Also, scanner callbacks often run off the main thread, so any UI work must be dispatched to the main thread (or the transition may silently fail).

Programmatic push/present example (run on the main thread from the scan callback):

InvokeOnMainThread(() =>
{
    var dest = Storyboard?.InstantiateViewController("SongListVC") as SongListVC;
    if (dest == null) return;                 // bad storyboard ID / class
    if (NavigationController != null)
        NavigationController.PushViewController(dest, true);
    else
        PresentViewController(dest, true, null);
});

If a segue was created in Interface Builder, trigger it on the main thread and use PrepareForSegue to pass data:

InvokeOnMainThread(() => PerformSegue("ShowSongListSegue", this));

Troubleshooting checklist (common causes seen in threads like this):

  • Confirm the destination’s Storyboard ID exactly matches the string (case-sensitive).
  • If Storyboard is null, use UIStoryboard.FromName("Main", null) — names differ by project.
  • If the app uses a modal scanner UI, dismiss it first (DismissViewController) then perform the transition inside the dismiss completion handler.
  • Ensure only one navigation happens per scan (guard a boolean flag to avoid duplicate pushes).
  • Add logs or breakpoints in the scan callback and right before the push/present to confirm execution order and threading.

Reference posts: this addresses the instantiation attempts from and provides the actionable navigation patterns that was asking about.

Member Avatar for silent lover

tried this one too but also did not work:

UIViewController songlist = new SongListVC ();
songlist.Transition (PasscodeVC, SongListVC);

Member Avatar for Michael_31

Hi

have you found a solution to the problem

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