demo-xf-app-1a/MobileApp1/Views/SettingsPage.xaml.cs

using System;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace MobileApp1.Views
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class SettingsPage : ContentPage
    {
        protected bool isBusy = false;

        public SettingsPage()
        {
            InitializeComponent();
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();

            if (pickerBox1.Items.Count > 0) pickerBox1.SelectedIndex = 0;
        }

        private bool IsBusy
        {
            get => isBusy;
            set
            {
                isBusy = value;

                Device.BeginInvokeOnMainThread(() =>
                {
                    loadingIndicatorView1.IsRunning = value;
                    checkBox1.IsEnabled = switchBox1.IsEnabled = datePicker1.IsEnabled = pickerBox1.IsEnabled = timePicker1.IsEnabled = !value;
                    button1.IsEnabled = !value;
                });

            }
        }

        private async void button1_Clicked(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                //if (this.Parent == null)
                //{
                //    return;
                //}

                //ContentPage cp = ContentViewHelper.GetContentPage(this);
                //if (cp == null)
                //{
                //    return;
                //}

                //App ap = ContentViewHelper.GetApp(this);
                //if (ap == null)
                //{
                //    return;
                //}

                this.IsBusy = true;

                //ServiceResult result = ap.CorporationService.Login(textbox1.Text, textbox2.Text);

                loadingIndicatorView1.Message = "Saved";

                Device.BeginInvokeOnMainThread(() =>
                {
                    DisplayAlert("Settings", "Saved", "OK");
                });

                this.IsBusy = false;

                //ContentViewHelper.SetMainPage(this, new AppShell());

                //if (result.IsSuccess)
                //{

                //}

            });
        }

    }
}