Xamarin & MvvmCross Handbook
  • Introduction
  • Using MvvmCross to create your first Xamarin App
    • Creating the Core project
      • Understanding MVVM
      • Adding a simple Service
      • Adding a ViewModel
      • Adding an App class
    • Creating the Android project
      • Adding an Android Application class
      • Adding the Android Layout View (AXML)
      • Understanding the data-binding syntax
      • Adding the View class
    • Creating the iOS project
      • Updating the AppDelegate class
      • Adding the iOS View for the first ViewModel
      • Understanding the data-binding syntax
    • Creating the UWP project
      • Updating the App.xaml.cs and the App.xaml
      • Adding the UWP View
      • Understanding the data-binding syntax
    • Creating the REST API Service
      • Creating the models
      • Creating the interface and the implementation for the PostService
      • Creating the ViewModel
      • Adding the View for the Android project
      • Adding the View for the iOS project
      • Adding the View for the UWP project
    • Navigation
      • Creating the PostDetail View & ViewModel
      • Command with the parameter
      • Retrieving the param from the previous ViewModel
      • Understanding the IMvxNavigationService
      • Responding the events from different controls in the ListView
      • Retrieving the return result from the previous ViewModel
    • Creating the Xamarin.Forms project
      • Creating the Forms.UI project
      • Adding the App.xaml and the App.xaml.cs
      • Adding the View
      • Creating the Android project
      • Creating the iOS project
      • Creating the UWP project
      • Summary For Forms
    • Summary
  • Implementing MasterDetail layout in Xamarin.Forms by MvvmCross
    • Introduction
    • Creating the project by MvxScaffolding
    • Creating the MasterDetailPage
      • Creating the ViewModel
      • Creating the XAML file
    • Creating the MasterPage
      • Creating the ViewModel
      • Creating the XAML file
    • Creating the DetailPages
      • Creating the ViewModels
      • Creating the XAML files
    • Implementing the Menu functionalities
      • Displaying the MasterPage and the DetailPage
      • Setting the menu navigation
      • The other approaches to set the data-binding
    • Fine-tuning the UI
      • Adding the hamburger icon for iOS
      • Adding the header bar for Android and iOS
      • Adjust the height of the item for UWP
    • Summary
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  1. Using MvvmCross to create your first Xamarin App
  2. Navigation

Creating the PostDetail View & ViewModel

I will not post all the codes here and you can get the codes from the GitHub repo: https://github.com/yanxiaodi/MvvmCrossDemo. I also created a new Comment model, a service interface and the implementation for comments. Now look at the codes in the PostDetailViewModel:

namespace MvvmCrossDemo.Core.ViewModels
{
    public class PostDetailViewModel : MvxViewModel
    {
        private readonly IPostService _postService;

        public PostDetailViewModel(IPostService postService)
        {
            _postService = postService;
        }

        public override void Prepare()
        {
            // This is the first method to be called after construction
            CommentList = new MvxObservableCollection<Comment>();

        }

        public override async Task Initialize()
        {
            // Async initialization, YEY!

            await base.Initialize();
        }


        #region Post;
        private Post _post;
        public Post Post
        {
            get => _post;
            set => SetProperty(ref _post, value);
        }
        #endregion

        #region CommentList;
        private MvxObservableCollection<Comment> _commentList;
        public MvxObservableCollection<Comment> CommentList
        {
            get => _commentList;
            set => SetProperty(ref _commentList, value);
        }
        #endregion

        private async Task GetPost(int postId)
        {
            var response = await _postService.GetPost(postId);
            if (response.IsSuccess)
            {
                Post = response.Result;
            }
        }

        private async Task TaskGetComments(int postId)
        {
            var response = await _postService.GetComments(postId);
            if (response.IsSuccess)
            {
                CommentList.AddRange(response.Result);
            }
        }
    }
}

In this ViewModel, we have to get the postId from the previous view for the data initialization. But how to pass the param to the PostDetailViewModel?

PreviousNavigationNextCommand with the parameter

Last updated 6 years ago

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