在多个Xamarin.Forms视图上显示时间

// MainPage.xaml
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="YourNamespace.MainPage">
    <StackLayout>
        <Label x:Name="timeLabel" Text="Current Time" HorizontalOptions="Center" VerticalOptions="Center" />
    </StackLayout>
</ContentPage>

// MainPage.xaml.cs
using System;
using Xamarin.Forms;

namespace YourNamespace
{
    public partial class MainPage : ContentPage
    {
        private Timer timer;

        public MainPage()
        {
            InitializeComponent();
            timer = new Timer(1000); // 每秒更新一次时间
            timer.Elapsed += Timer_Elapsed;
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            timer.Start();
        }

        protected override void OnDisappearing()
        {
            base.OnDisappearing();
            timer.Stop();
        }

        private void Timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            Device.BeginInvokeOnMainThread(() =>
            {
                timeLabel.Text = DateTime.Now.ToString("HH:mm:ss");
            });
        }
    }
}