Trenton Tyler Trenton Tyler - 1 year ago 861
iOS Question

Swift performSegueWithIdentifier not working

I am trying to switch view controllers after a user successfully logs in to their account, but it is not working correctly. I cant use a segue directly because if the login button is clicked it will go to that view controller regardless if the information is correct or not. I have tried everything that I know of with no success. This is the code I am trying.

@IBAction func loginTapped(sender: AnyObject) {

let username = usernameField.text
let password = passwordField.text

if username.isEmpty || password.isEmpty {
var emptyFieldsError:UIAlertView = UIAlertView(title: "Please try again", message: "Please fill in all the fields we can get you logged in to your account.", delegate: self, cancelButtonTitle: "Try again")

PFUser.logInWithUsernameInBackground(username, password:password) {
(user: PFUser?, error: NSError?) -> Void in
if user != nil {
self.performSegueWithIdentifier("Klikur", sender: self)
} else {
if let errorString = error!.userInfo?["error"] as? String {
self.errorMessage = errorString

self.alertView("Please try again", message: "The username password combiation you have given us does not match our records, please try again.", buttonName: "Try again")


I have the storyboard ID set to "Test" and it is not switching view controller when the correct information is entered. Can somebody help me resolve my problem?

Here is the code for the LoginViewController
Here is the attributes panel for the KlikurTableViewController

Answer Source

The segue identifier that you pass to performSegueWithIdentifier(_:sender:) must exactly match the ID you've given the segue in the storyboard. I assume that you have a segue between the login view controller and the success view controller, which is as it should be; if not, ctrl+drag from the first to the second view controller, then select the segue's icon in the storyboard and set its ID to Klikur. Don't perform the navigation on the button click, as one commenter said, because that defeats the main purpose of having segues, which is to give a visual indication of the application flow in the storyboard.

EDIT: Here's the code for a login view controller:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var usernameField: UITextField!
    @IBOutlet weak var passwordField: UITextField!

    @IBAction func attemptLogin(sender: AnyObject) {
        if !usernameField!.text!.isEmpty && !passwordField!.text!.isEmpty {
            performSegueWithIdentifier("Klikur", sender: self)

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if "Klikur" == segue.identifier {
            // Nothing really to do here, since it won't be fired unless
            // shouldPerformSegueWithIdentifier() says it's ok. In a real app,
            // this is where you'd pass data to the success view controller.


And a screenshot of the segue properties that I'm talking about: enter image description here

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