我如何使用PCL项目在Xamarin中为Android和iOS开发应用程序？

Question

I have created a Xamarin PCL project, it has Android iOS and Portable. I had a look at few examples, where in you can create a Login Page using Xaml and then validate those credentials using a CS file for it,but my question is lets say I validate those credentials, how do I jump from that UI page which is universal I suppose to the Android or the iOS part?

And where do I start ??

Sorry if I am being naive, I am new to Xamarin, any help would be appreciated.

This is the sample i'm referring for Portable,

using System;
using Xamarin.Forms;

namespace StoreCredentials
{
    public class HomePageCS : ContentPage
    {
        public HomePageCS ()
        {
            var toolbarItem = new ToolbarItem {
                Text = "Logout"
            };
            toolbarItem.Clicked += OnLogoutButtonClicked;
            ToolbarItems.Add (toolbarItem);

            Title = "Home Page";
            Content = new StackLayout { 
                Children = {
                    new Label {
                        Text = "Main app content goes here",
                        HorizontalOptions = LayoutOptions.Center,
                        VerticalOptions = LayoutOptions.CenterAndExpand
                    }
                }
            };
        }

        async void OnLogoutButtonClicked (object sender, EventArgs e)
        {
            DependencyService.Get<ICredentialsService> ().DeleteCredentials ();
            Navigation.InsertPageBefore (new LoginPage (), this);
            await Navigation.PopAsync ();
        }
    }
}

Answer 1

I would recommend you to read this before diving into Xamarin. Also, this as it relates to something you are trying to do.