ios - Swift error : signal SIGABRT how to solve it

Question

I'm just a beginner in Swift coding. My idea is quite simple which is an app with two buttons. When clicked, a textfield will change its text. In the Main.StoryBoard, I add a textfield and two buttons. In ViewController.swift file. I write as this:

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var textfield: UITextField!
    @IBOutlet weak var button: UIButton!
    @IBOutlet weak var button2: UIButton!

    @IBAction func action1(_ sender: UIButton) {
        textfield.text="you just clicked on button1"
    }
    @IBAction func action2(_ sender: UIButton) {
        textfield.text="you just clicked on button2"
    }
}

It is supposed to be all right. However, an error appears which shows:

thread1:signal SIGABRT

in file AppDelegate.swift line:

class AppDelegate: UIResponder, UIApplicationDelegate

What is wrong with my code?

Answer 1

You get a SIGABRT error whenever you have a disconnected outlet. Click on your view controller in the storyboard and go to connections in the side panel (the arrow symbol). See if you have an extra outlet there, a duplicate, or an extra one that's not connected. If it's not that then maybe you haven't connected your outlets to your code correctly.

Just remember that SIGABRT happens when you are trying to call an outlet (button, view, textfield, etc) that isn't there.