MAUI Development Guide

Introduction

MAUI is a cross-platform UI toolkit that allows developers to efficiently create native cross platform user interface layouts.
This document is intended to show how to setup a MAUI development environment and introduce existing features and user interfaces on ASP.NET Zero MAUI platform. For an overview of the MAUI installation and setup practices see MAUI Offical Documentation For an overview of the ASP.NET Zero getting started see ASP.NET Zero Getting Started. The ASP.NET Zero MAUI is only available for ASP.NET Core included Angular UI and Mvc UI.

ASP.NET Zero uses Blazor version of MAUI with Metronic theme. Since it is a Blazor application, you can basically develop your application using html and css.

Prerequisites

Following tools are needed in order to develop ASP.NET Zero MAUI:

Visual Studio 2022 17.3 +

IOS

To build, sign, and deploy .NET MAUI apps for iOS, you'll also need:

A Mac that is compatible with the latest version of Xcode. For more information, see Apple's minimum requirements documentation
The latest version of Xcode.
An Apple ID and paid Apple Developer Program enrollment. An Apple ID is required to deploy apps to devices, and to submit apps to the Apple Store.

Solution Structure (Layers)

After downloading your project, you will see 3 types of solutions;

.Mobile MAUI and related projects included.
.Web Web and related projects included.
.All All the projects included.

For MAUI development, you can open .Mobile.sln.

MAUI Architecture

Mobile Solution

There are 4 projects in the mobile solution:

Core.Shared project contains basic primitive types like consts, enums that used in all layers of the solution.
Application.Shared project contains data transfer objects (DTOs) and interfaces of application services shared with application layer of the backend.
Application.Client project contains Web Api client (bridge between mobile app and host) and proxy classes of Application Services.
Mobile.MAUI project contains mobile application.

MAUI app contains all platform specific files in the Platforms folder in project folder.

Debugging

Host

To start debugging MAUI app you need to configure host settings. You can use Web.Host to feed the MAUI app. Open Windows Command Prompt. Go to the folder where your Web.Host csproj file is located.
Then run the command below to start hosting your Web API:

dotnet run --launch-profile Mobile

This will start the Web.Host project from the address "https://0.0.0.0:44301" which enables to access it from external networks.

Alternatively, there's start-host-mobile.bat file in your Web.Host directory which does the same for Windows users.

Warning

If you want to start Web.Host from Visual Studio, set Web.Host as startup project and choose the Mobile profile.

Create a development certificate

Installing the .NET Core SDK installs the ASP.NET Core HTTPS development certificate to the local user certificate store. However, while the certificate has been installed, it's not trusted. To trust the certificate, perform the following one-time step to run the dotnet dev-certs tool:

dotnet dev-certs https --trust

This will allow to trust the self-signed ASP.NET Core HTTPS development certificate in your computer.

For more information, see Connect to Local Web Services from iOS Simulators and Android Emulators

We have successfully started host. Now we can configure MAUI app to connect this host.

Prepare for production

When you release your MAUI app for production you need to change DefaultHostUrl in ApiUrlConfig class!

ApiUrlConfig.DefaultHostUrl = "https://mywebapi.com/"

Important Be aware that connecting over Wi-Fi needs both the device and the computer to be on the same Wi-Fi network! To avoid confusions to you can completely turn off your mobile data connection.

Debugging Android

There are a few installation steps and configuration details required to install MAUI. It's highly recommended you to read the MAUI Android for necessary setups.

If you are using the default Android Emulator, you don't need to change anything. The default loopback address for the Android emulator is 10.0.2.2 and it's written in the StartApplication() method of MainLayout.razor.cs
```
DebugServerIpAddresses.Current = "10.0.2.2";
```
If you are using Genymotion Emulator, change it as below:
```
DebugServerIpAddresses.Current = "10.0.3.2"
```
If you are using a real Android device, change it as your computer's local IP and make sure your Android device and your computer is connecting from the same network (your local Wi-Fi). To connect your real mobile device, make sure your computer's firewall is off (or create an exception in your firewall to allow the port 44301)
```
DebugServerIpAddresses.Current = "XXX.XXX.XXX.XXX"
```

After successful setup, set Mobile.MAUI as startup project. Choose an Android emulator from list and press start button.

Debugging iOS

There are a few requirements that must be adhered to when developing for iOS in Visual Studio. A Mac, an IPAD or an IPhone is required to compile IPA files. Applications cannot be deployed to a device without Apple's certificates and code-signing tools. Also, the iOS simulator can be used only on a Mac.

You need to set DebugServerIpAddresses as your local IP. Eg: 192.168.1.120

DebugServerIpAddresses.Current = "XXX.XXX.XXX.XXX";

Mobile.MAUI

Folder struction

MAUI project has a very basic structure. ASP.NET Zero adds or modifies these files in the default project;

Android Project Structure

Pages This is where all pages located. You can add your pages in that folder. Pages added here will be used in Android and IOS.
Platforms This is where all platrform specific implemetations can be made. Every code written here is only published to the relevant platform.You can locate any platform specific codes in that folders. For example, If your service has platform based implementation, you can use that folder and implement it to DI container according to their platform.
Resources This is where application resources located.
Services This is where mobile based services implemented.
Shared This is where all blazor based shared items located. Layouts, base components, partial components are located in this folder.
wwwroot Since ASP.NET Zero uses Blazor version of MAUI, all web based items(index.html, css, js etc...) are located in this folder.

Dependency Injection

ASP.NET Zero MAUI uses ASP.NET Boilerplate Framework's dependency injection system. Therefore it uses Castle Windsor as an Inversion of Control container. To resolve dependencies; you can use constructor or property injection, beside there's a shortcut class called DependencyResolver, which can be used to resolve dependencies as well. ASP.NET Boilerplate provides ITransientDependency and ISingletonDependency interfaces as a shortcut to register classes. See ASP.NET Boilerplate Dependency Injection

Communicating with Host Api

AbpApiClient class is used to communicate with host. In this class, FlurlClient is used as http client. The host address DefaultHostUrl is stored in ApiUrlConfig class. Before publishing application you need to change this address with your production host server address. In development time, it's important to change LocalhostIp as your computer's LAN IP in DebugServerIpAdresses.cs.

WebRequestExecuter class handles http web requests in a safe manner. When the request fails, it handles different types of exceptions. So if it's a timeout exception, it asks user to retry the same request. Or if it's a user friendly exception thrown by ABP it shows an alert and so on... You have to write a success and a fail callback to handle the result. In fail callback, the exception can be retrieved and in success callback result of the request can be retrieved.

SetBusyAsync method is in the base class of components in AbpZeroTemplateComponentBase class. Whenever a long lasting operation is required it should be wrapped with SetBusyAsync method in view model so that user can see a busy indicator.

Exception Handling

All exceptions are globally handled in ExceptionHandler class, when you use WebRequestExecuter.

Pages

InitialView

InitialView is a transition page that checks whether user has any granted menu permission or not. If user has no permissions then an info message will be shown on the screen. But if user has at least one granted menu permission, it is automatically being navigated to the first authorized menu item.

Login

When user enters credentials AccessTokenManager authenticates user, stores access token in memory. For authentication needed Api calls, this token is being added to the request as bearer token. There's a timer in AccessTokenManager class that renews token before it expires. If an error occurs while communicating with host, client tries to reconnect using refresh token within an exponentiation increasing time. After successful login user credentials are stored in device. User information is being set in ApplicationContext so if current logon account information is needed it can be retrieved with injecting IApplicationContext.

Tenants View

In this page you can see all tenants in your application. You can create new tenant, edit tenant or delete tenant. (If you have necessary permissions, otherwise you will not be able to see related buttons or page) There is a search bar on the top that filters tenants. You can Create new tenant, Edit or Delete existing tenants using related button in the row. (If you dont have permission buttons will not be shown)

Create Tenant	Edit Tenant	Delete Tenant

User View

This page lists users of the tenant or tenant owner. It is only shown if the user has permission to this page. Same as tenants view, there's a search bar and a new user creation toolbar item. hen a user is being tapped, it's navigated to edit user modal with the selected user.

You can create new user or manage existing one.

Create User	Edit User	Delete User

Distribution

Configuration

Before publishing the application change the DefaultHostUrl in ApiUrlConfig class. how to distribute MAUI application.
Change all application icon files with your own app icon.
Change all AppLogo.png files with your own app logo.
Version your application for future updates.

Publishing

If you want to publish your application to the related application store you can read the MAUI official guides;