Trouble changing the text on a UIButton in swift

Question

So, I am very new to XCode and Swift. I am having trouble changing the title text on a UIButton, and I keep getting the error

fatal error: unexpectedly found nil while unwrapping an Optional value

This is my code :
//
//  ViewController.swift
//  mtgHealthTracker
//
//  Created by Reagan McFarland on 5/1/16.
//  Copyright © 2016 Reagan McFarland. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    //Mark : Properties


    @IBOutlet weak var btnPlayer1Health: UIButton!
    @IBOutlet weak var btnPlayer4Health: UIButton!
    @IBOutlet weak var btnPlayer3Health: UIButton!
    @IBOutlet weak var btnPlayer2Health: UIButton!

    @IBOutlet weak var lblCurrWinner: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    //Mark Actions
    @IBAction func btnPlayer1HealthChanged(sender: UIButton, forEvent event: UIEvent) {
        btnPlayer1Health.setTitle("Hello World", forState: UIControlState.Normal)

    }

    @IBAction func btnPlayer2HealthChanged(sender: UIButton, forEvent event: UIEvent) {
    }

Help is greatly appreciated! Thanks :)

Also see http://www.raywenderlich.com/10209/my-app-crashed-now-what-part-1 to learn how to debug a crash. — rmaddy, May 01 '16 at 23:28

score 1 · Accepted Answer · answered May 01 '16 at 23:29

1

One or more of your IBOutlet's are not connected within your XIB/Storyboard. Make sure to select your File's Owner and drag your IBOutlet to your XIB/Storyboard element.

answered May 01 '16 at 23:29

Christopher Harris

672
3
11

See here: https://www.makeschool.com/tutorials/learn-swift-by-example. Specifically this image --> https://git.makeschool.com/MakeSchool-Tutorials/Short-Tutorials/fa536780a0168af7bc4d8bc57d3910c586bb1ed0/Learn-Swift-By-Example/P0/swift_tut_05.png – Christopher Harris May 02 '16 at 00:04
Thank you so much! It works :) – Reagan McFarland May 02 '16 at 00:10
Great! much appreciated if you could accept the answer – Christopher Harris May 02 '16 at 00:11

Trouble changing the text on a UIButton in swift

1 Answers1