Handling life cycle events

Finally, we need to add some life cycle events that will take care of our SignalR connection in case the app goes to sleep or when it wakes up again:

1. Open the App.xaml.cs file.
2. Add the following code somewhere inside the App class:

protected override void OnSleep()
{
    var chatService = Resolver.Resolve<IChatService>();
    chatService.Dispose();
}
         
protected override void OnResume()
{
    Task.Run(async() =>
    {
        var chatService = Resolver.Resolve<IChatService>();
 
        if (!chatService.IsConnected)
        {
            await chatService.CreateConnection();
        }
    });
 
    Page view = null;
 
    if(ViewModel.User != null)
    {
        view = Resolver.Resolve<ChatView>();
    }
    else
    {
        view = Resolver.Resolve<MainView>();
    }
 
    var navigationPage = new NavigationPage(view);
    MainPage = navigationPage;
} 

The OnSleep() method will be called when the user minimizes the app. It will dispose of any...