ios - 为什么单击按钮时会出现 NSUnknownKeyException？

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.
}

Answer 1

您似乎没有定义导出(不再)。 Storyboard仍然认为有一个 @IBOutlet Weak var Button_1: UIButton? 但你显然已经删除了它。