Why do I get NSUnknownKeyException when I click on a button?

Question

app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key button_1.'

class ViewController: UIViewController {

@IBAction func button1_pressed(sender: AnyObject) {
    NSLog("hello");
}

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.
}

}

possible duplicate of [This class is not key value coding-compliant for the key](http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key) — jtbandes, Aug 01 '15 at 22:01

score 1 · Accepted Answer · answered Apr 07 '15 at 16:52

1

It seems that you have no outlet defined (anymore). The storyboard still thinks there is an @IBOutlet weak var button_1: UIButton? but you have deleted it apparently.

answered Apr 07 '15 at 16:52

Glorfindel

21,988
13
81
109

score 0 · Answer 2 · answered Apr 07 '15 at 17:14

0

Check storyboard or xib (whichever you're using). The most likely source of this error is that something has a connection to an action or outlet that doesn't exist in the code.

answered Apr 07 '15 at 17:14

Uttam Sinha

722
6
9

Why do I get NSUnknownKeyException when I click on a button?

2 Answers2