为什么viewWithTag返回nil

Question

activite1Label作为标签1

class StatsViewController: UIViewController {

    @IBOutlet weak var activite1Label: UILabel!
    @IBOutlet weak var activite2Label: UILabel!
    @IBOutlet weak var activite3Label: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        activite1Label.text = activite[0]
        activite2Label.text = activite[1]
        activite3Label.text = activite[2]

        miseAjourTotal()

    }

    func miseAjourTotal() {        
        let leLabel = view.viewWithTag(1) as! UILabel
        print("leLabel: \(leLabel.text)")
    }
}

Answer 1

您的代码中没有任何内容告诉标签有标签1.您应该转到故事板并检查标签是否有标签1或以编程方式设置标签