标签不显示文本 - Xamarin IOS

本文关键字：Xamarin IOS 文本 显示 标签 | 更新日期: 2023-09-27 18:37:00

我正在做一个倒计时，它应该在计数中显示一个标签，但我的视图控制器上的标签（lblMostrador）不显示文本。代码是正确的，因为输出框正确显示计数。标签是否有任何特殊配置或工作？

partial class EsquerdaViewController ： UIViewController {

    private System.Timers.Timer aTimer;
    private DateTime tempo   = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 0, 1, 0);
    private DateTime tempo2  = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 0, 0, 1);

    public EsquerdaViewController (IntPtr handle) : base (handle)
    {
    }
    public override void ViewDidLoad()
    {
        base.ViewDidLoad ();
        Console.WriteLine ("Testando...");
        btnVoltar.TouchUpInside += (sebder, e) => 
        {
            NavigationController.PopViewController(true);
        };

        btnIniciar.TouchUpInside += (sender, e) =>
        {
            aTimer = new System.Timers.Timer(1000);
            aTimer.Elapsed += OnTimedEvent;
            aTimer.AutoReset = true;
            aTimer.Enabled = true;
        };

    }
    private void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
    {
        System.TimeSpan diff1   = tempo.Subtract(tempo2);
        if (diff1.Minutes == 0 && diff1.Seconds == 0)
            aTimer.Stop();
        DateTime tempoNovo      = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 0, diff1.Minutes, diff1.Seconds);
        tempo                   = tempoNovo;
        Console.WriteLine (String.Format("{0:00}:{1:00}", diff1.Minutes, diff1.Seconds));
        lblMostrador.Text = String.Format ("{0:00}:{1:00}", diff1.Minutes, diff1.Seconds);
    }
}

标签不显示文本 - Xamarin IOS

更新 UI

对象时，需要确保在 UI 线程上执行：

InvokeOnMainThread ( () => {
  lblMostrador.Text = String.Format ("{0:00}:{1:00}", diff1.Minutes, diff1.Seconds);
});
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