NSInvalidArgumentException reason Receiver has no segue with identifier

Question

I have problem I've been sitting with. I have a UIViewController List and a UIViewController Login. On Login I have a button "Done", also another hidden button on the same UIViewController that has a segue to List (Type: push). I gave it an identifier in the interface builder of xcode named "LoginToList". Now from another class (a class that runs while Login is the active controller) I call:

[[Login sharedLogin] performSegueWithIdentifier:@"LoginToList"];

The Login class clearly has a segue with identifier "LoginToList"

Yet I keep getting:

 'NSInvalidArgumentException', reason: 'Receiver (<Login: 0x6d79d90>) has no segue with identifier 'LoginToList''

the + (id) sharedLogin looks like this:

+ (id) sharedLogin {
    static Login *sharedLogin = nil;

    @synchronized(self) {
        if (sharedLogin == nil) {
            sharedLogin = [[self alloc] init];
        }

        return sharedLogin;
    }
}

If anyone has any idea why it says that, I'd be glad to hear it! :D I don't know if I'm missing something stupid but I can't spot it :(

EDIT: I have create a segue in the interfacebuilder (ctrl + click drag from Login to List) using the UIViewControllers themselfves (Login & List). Then I named the segue "LoginToList" in other words I gave it that identifier. I clicked the segue and at the top-right there was a "Identifier" field which I used.

I Still get the error saying Login has no segue with identifier "LoginToList". sad

Answer 1

As far as your code snippet goes, it looks like you tried to create a singleton out of the Login Controller, but only did it half way.

The seque can't be found because the the Controller was initialized using the storyboard, not using your shared class method. So you end up having two independent instances. Additionally, your class method does not initialize the controller with the storyboard bindings, so you don't have any seques here.

You should try to hand a reference of the LoginController's instance (initialized unsing storyboard segues etc.) to the 'other class' and use that one.