Swift prepareForSegue cancel

Question

I\'m trying to implement a login screen, when login is clicked it does the segue \"login\".

I added a prepareForSegue() override to try to cancel it if the login fai

Answer 1

You could use shouldPerformSegue and return false, therefore blocking all segues. For example:

override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
    return false 
}

Then, once you have a successful login, call performSegue, like this:

performSegue(withIdentifier: "YourSegueIdentifier", sender: nil)

This will ensure that you will only transition to the controller when you have a login success.