Omar Kayali Omar Kayali - 1 year ago 125
Objective-C Question

Swift: Creating a button that calls a method in another class1

I have 2 classes, the first class is named "store" where I create a button which calls a method:"storeSelected" located in the second class with the name "ExploreViewControllers". The method should print "done" and take me to another view controller.
Without the segue "done" is printed but when putting the segue code the app crashes.

The error is Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Receiver () has no segue with identifier 'ok''

//ExploreViewController Class

let _sharedMonitor: ExploreViewController = { ExploreViewController() }()

class ExploreViewController: UIViewController, UIScrollViewDelegate{

class func sharedMonitor() -> ExploreViewController {
return _sharedMonitor


func storeSelected(sender: UIButton) {

println("done") // it entered here and "done" is printed

self.performSegueWithIdentifier("ok", sender: self) //here is the problem


// another class named "Store"

//button is created
let monitor = ExploreViewController.sharedMonitor()

btn.addTarget(monitor, action: Selector("storeSelected:"), forControlEvents: UIControlEvents.TouchUpInside)

Answer Source

Assuming that you have a view controller where you create the Store object - you should pass the button action back to this view controller and add a segue from it to your desired destination.

Best practice is to use a protocol that delegates the buttons action back up to the viewController that it is contained in as below.


protocol StoreDelegate {
    func didPressButton(button:UIButton)

class Store: UIView {

    var delegate:StoreDelegate!

    override init(frame:CGRect) {

        var button = UIButton()
        button.setTitle("button", forState: .Normal)
        button.addTarget(self, action: "buttonPress:", forControlEvents: .TouchUpInside)

    func buttonPress(button:UIButton) {



class ViewController: UIViewController, StoreDelegate {

    override func viewDidLoad() {

    func addStoreObj() {
        var store = Store()
        store.delegate = self

    func didPressButton(button:UIButton) {
        self.performSegueWithIdentifier("ok", sender: nil)


This code is untested, but I hope you get the idea - your Store object delegates the button press activity back to its containing ViewController and then the ViewController carries out the segue that you have attached to it in the Storyboard.

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