NSUnknownKeyException？为什么？

Question

我已多次在Xcode7中尝试过，但仍然按照以下问题进行操作：

TapWar[10487:391936] *** Terminating app due to uncaught exception 'NSUnknownKeyException', 
reason: '[<TapWar.ViewController 0x7f9848483220> setValue:forUndefinedKey:]: 
this class is not key value coding-compliant for the key buttomButtonAction.'

代码没有什么特别之处，只是故事板的出口和动作     导入UIKit

class ViewController: UIViewController {


    @IBOutlet weak var topButton: UIButton!
    @IBOutlet weak var buttomButton: UIButton!
    @IBOutlet weak var topLabel: UILabel!
    @IBOutlet weak var buttomLabel: UILabel!


    override func viewDidLoad() {
        super.viewDidLoad()
    score = 0

    topLabel.text = "\(score)"
    buttomLabel.text = "\(score)"

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
//Button on top to tap
    @IBAction func topButtonAction(sender: UIButton) 

    }
//Button under to tap
    @IBAction func buttomButtonAction(sender: AnyObject) {

    }
}

Answer 1

您是否检查过您的IBOutlet或IBAction连接？ 该错误通常会导致名称不一致。