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iOS

Posted by Rebekah Bae
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Rebekah Bae
iOS Development Techdegree Student 1,574 Points

Fatal Error Message

The code I've written for "Build a Simple iPhone App with Swift 3" keeps bringing up the error message: "fatal error: unexpectedly found nil while unwrapping an Optional value (lldb) ". My code is below.

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var funFactLabel: UILabel!
let facts = ["Ants stretch when they wake up in the morning", "Ostriches can run faster than horses"]

override func viewDidLoad() {
    super.viewDidLoad()

    funFactLabel.text = facts[0] //This is where the error message is coming from
}

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

@IBAction func showFact() {
    funFactLabel.text = facts[1]
}

}

Someone please help me figure out what's going on!

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Rebekah Bae,

For future questions, it would be more helpful if you posted the full error message so we can see what's happening here. Without this, I'm going to guess your problem is that your ViewController has an orphaned outlet in its Storyboard file.

To solve this:

Select your ViewController in the Storyboard file and at the top of it, CTRL+click on the Yellow Icon on the far left. If you see any Yellow ! Warnings, this means you have unconnected outlets or actions and need to either delete them or reconnect them.

Also, make sure your original IBOutlet for the funFactLabel is connected. If it is, there will be a filled in dot to the left of the line number for that outlet in code.

Let me know if this helps.

Good Luck