爲什麼這會在UIlabel上放棄？

Question

我連接了UILabel和UIButton，但仍然中止。請幫我解決這個問題。

import UIKit 

class ViewController: UIViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     counterLabel.text = "0" 
     // Do any additional setup after loading the view, typically from a nib. 
    } 
    var counterNum: Int = 0 

    @IBOutlet weak var counterLabel: UILabel! 

    @IBAction func Tap(_ sender: UIButton) { 

     self.counterNum += 1 
     self.counterLabel.text = String(self.counterNum) 
    } 
} 

Answer 1

請檢查您的出口連接在您的故事板counterLabel。看起來你忘了做插座連接。