rdelrosario

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

        public async Task StartAsync(IStartupTask task)
        {
            foreach (var next in _tasks.SkipWhile(x => x != task))

rdelrosario

public interface IStartupTaskSequencer
{
    Task StartAsync();

    Task StartAsync(IStartupTask task);
}

rdelrosario

public partial class SplashPage : ContentPage
{
    IStartupTaskSequencer sequencer;

    public SplashPage()
    {
        InitializeComponent();
        sequencer = new StartupTaskBuilder()
                           .Add(new SimulateDownloadDataStartupTask())
                           .Add(new UpdateVersionStartupTask())

rdelrosario

public class StartupTaskBuilder
{
    public StartupTaskBuilder() => _tasks = new Queue<IStartupTask>();

    public StartupTaskBuilder Add(IStartupTask task)
    {
        QueueTask(task);

        return this;
    }

rdelrosario

public interface IStartupTaskSequencer
{
    Task StartAsync();
}

rdelrosario

public abstract class StartupPage : ContentPage, IStartupTask
{
    protected virtual Task<bool> CanRunAsync() => Task.FromResult(true);

    protected async Task CompleteAsync()
    {
        await Navigation.PopModalAsync(false);

        _tcs?.SetResult(true);

rdelrosario

public partial class OnboardingPage : StartupPage
{
    public ICommand NextCommand { get; }
    public OnboardingPage()
    {
        InitializeComponent();
        NextCommand = new Command(async() =>
        {
            await CompleteAsync();
        });

rdelrosario

<?xml version="1.0" encoding="UTF-8" ?>
<ContentPage
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="StartupTaskSequenceSample.Views.SplashPage"
    BackgroundColor="{StaticResource AppPrimaryColor}">
    <ContentPage.Content>
        <StackLayout VerticalOptions="CenterAndExpand"
                     Spacing="30">
           <Label Text="♜"

rdelrosario

public class UpdateVersionStartupTask : IStartupTask
{
    public Task<bool> CanRunAsync() => Task.FromResult(true);

    public Task RunAsync()
    {
        //TODO: Do Store version code here, can't do it since this app is not in the store
        return App.Current.MainPage.DisplayAlert("New Version", "There is a new version of this app available. Would you like to update now?", "Yes", "No");
    }
}

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public class SimulateDownloadDataStartupTask : IStartupTask
{
    public Task<bool> CanRunAsync() => Task.FromResult(true);

    public Task RunAsync() => Task.Delay(5000);
}