rdelrosario

        private class StartupTaskSequencer : IStartupTaskSequencer
        {
            public StartupTaskSequencer(Queue<IStartupTask> tasks) => _tasks = tasks;

            public async Task StartAsync(IStartupTask task, IStartupTaskParameters parameters = null)
            {
                parameters ??= StartupTaskParameters.None;

                foreach (var next in _tasks.SkipWhile(x => x != task))
                {

rdelrosario

public abstract class StartupPage : ContentPage, IStartupTask
{
   ...
    async Task<IStartupTaskParameters> IStartupTask.RunAsync(IStartupTaskParameters parameters)
    {
        _tcs = new TaskCompletionSource<IStartupTaskParameters>();

        await OnStartAsync(parameters);

        await App.Current.MainPage.Navigation.PushModalAsync(this);

rdelrosario

public interface IStartupTaskSequencer
{
    Task StartAsync();

    Task StartAsync(IStartupTask task, IStartupTaskParameters parameters = null);
}

rdelrosario

public partial class LoginPage : StartupPage
{
    public ICommand NextCommand { get; }

    public LoginPage() : base()
    {
        InitializeComponent();
        NextCommand = new Command(async() =>
        {
            await CompleteAsync(new StartupTaskParameters()

rdelrosario

public partial class HomePage : TabbedPage, IStartupTask
{
    public HomePage()
    {
        InitializeComponent();
    }
    public Task<bool> CanRunAsync() => Task.FromResult(true);

    public async Task<IStartupTaskParameters> RunAsync(IStartupTaskParameters parameters)
    {

rdelrosario

public interface IStartupTask
{
    Task<bool> CanRunAsync();

    Task<IStartupTaskParameters> RunAsync(IStartupTaskParameters parameters);
}

rdelrosario

public interface IStartupTaskParameters : IDictionary<string, object>{}

public class StartupTaskParameters : Dictionary<string, object>, IStartupTaskParameters
{
    public static IStartupTaskParameters None => _none ??= new StartupTaskParameters();

    private static IStartupTaskParameters _none;
}

rdelrosario

public partial class AdvertisingPage : StartupPage
{
    public AdvertisingPage()
    {
        InitializeComponent();
    }

    protected override Task<bool> CanRunAsync() => Task.FromResult(App.VersionType == VersionType.Free);
}

rdelrosario

public partial class App : Application
{
    public static VersionType VersionType => VersionType.Paid;

    public App ()
    {
        InitializeComponent();

        MainPage = new SplashPage();
    }

rdelrosario

public partial class SplashPage : ContentPage
{
    IStartupTaskSequencer sequencer;
    HomePage homePage = new HomePage();

    public SplashPage()
    {
        InitializeComponent();

        sequencer = new StartupTaskBuilder()