James Montemagno
Xamarin 101 serie
I wish I had started here.
Xamarin Tutorial for Beginners – Build iOS & Android Apps with C#, Visual Studio, and Xamarin.Forms
- 00:00 – Intro & What is .NET, C#, Xamarin
- 04:20 – Creating First Project in Visual Studio
- 08:45 – What’s in the solution (.NET Standard, iOS, Android)
- 12:40 – Exploring iOS and Android project setup 7 shared code
- 14:15 – MVVM (Model-View-ViewModel)
- 15:30 – Exploring XAML (App, AppShell, and Pages)
- 21:00 – Deploying to Android, Debugging, & XAML Hot Reload
- 28:20 – Deploying to iOS with Hot Restart
- 35:45 – Wrap-up
Configuring & Optimizing Xamarin Projects – Smaller, Faster, Better Apps
- 00:00 – Welcome & Intro
- 01:45 – Project Walkthrough
- 02:45 – Android Manifest
- 05:00 – Android Project Settings – Debug Settings
- 09:10 – Android Project Settings – Release Settings
- 12:25 – Android Compile & Target Settings
- 17:30 – Compiled Final Android Manifest
- 19:10 – iOS Info.plist & Entitlements.plist Location
- 20:00 – iOS Project Settings – Debug Settings
- 22:10 – iOS Project Settings – Release Settings
- 24:20 – Additional iOS Project Settings
- 25:30 – iOS Info.plist & Entitlements.plist Overview
- 31:30 – Wrap-up
Managing & Updating Xamarin NuGet Packages Efficiently
- 00:00 – Welcome – Let’s upgrade our NuGets
- 01:30 – What is a NuGet package?
- 03:30 – Exploring Dependencies
- 05:30 – Manage & Update NuGet Packages for Solution
- 09:30 – Consolidate NuGet Package Updates
- 10:10 – Exploring NuGet
- 13:10 – NuGet Package Explorer
- 15:40 – Modifying Package References in the csproj
- 18:00 – Wrap-up & Xamarin.Plugins Repo
Preparing a Xamarin.Forms Shell App for Development
Xamarin.Forms XAML 101 + Hello World! (& .NET MAUI)
https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/
MVVM 101 – Model-View-ViewModel Architecture for Xamarin.Forms & .NET MAUI (also WPF, UWP, & More)
- 00:00 – Introduction
- 01:30 – What is MVVM?
- 05:30 – Using Data Binding and INotifyPropertyChanged
- 14:10 – What is ICommand
- 17:30 – Using Commands, not Click Handlers
- 20:30 – Our First View Model
- 25:00 – Wrap-up
Binding modes
- OneWay: This is used when ViewModel updates a value. It should be reflected on the View
- OneWayToSource: This is used when the View changes a value. This value change should be pushed to the ViewModel.
- TwoWay: The data-flow is bidirectionnal
- OneTime: Data synchronization only occurs once the binding context has been bound and the data has been propagated from the ViewModel to the View.
In ViewModel
public partial class XXViewModel : ContentPage // extends INotifyPropertyChanged
{
private uint count = 0;
private string countDisplay = string.Empty;
public string CountDisplay
{
get => countDisplay;
set
{
if (value == countDisplay)
return;
countDisplay = value;
OnPropertyChanged(); // thanks to [CallerMemberName], can get rid of nameof(CountDisplay)
}
}
public CoffeeEquipmentPage()
{
InitializeComponent();
BindingContext = this;
}
private void ButtonClick_Clicked(object sender, System.EventArgs e)
{
count++;
CountDisplay = $"{count.ToString()} times";
}
}In View (XAML)
Button Text="{Binding CountDisplay}" Clicked="ButtonClick_Clicked" />Commands
In ViewModel
private void onIncrease()
{
count++;
CountDisplay = $"{count.ToString()} times";
}In Model
<Button Text="{Binding CountDisplay}" Command="{Binding IncreaseCount}" />Separate ViewModel file
In Model
<?xml version="1.0" encoding="UTF-8" ?>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:viewmodels="clr-namespace:MyCoffeeApp.ViewModels"
x:DataType="viewmodels:CoffeeEquipmentViewModel"
x:Class="MyCoffeeApp.Views.CoffeeEquipmentPage"
>
<ContentPage.BindingContext>
<viewmodels:CoffeeEquipmentViewModel />
</ContentPage.BindingContext>
<ContentPage.Content>
<Button Text="{Binding CountDisplay}" Command="{Binding IncreaseCount}" />
</ContentPage.Content>
</ContentPage>In ViewModel
using Xamarin.Forms;
using System.Windows.Input;
namespace MyCoffeeApp.ViewModels
{
public class CoffeeEquipmentViewModel : BindableObject
{
private uint count = 0;
private string countDisplay = "Click me to start";
public string CountDisplay
{
get => countDisplay;
set
{
if (value == countDisplay)
return;
countDisplay = value;
OnPropertyChanged(); // thanks to [CallerMemberName], can get rid of nameof(CountDisplay)
}
}
public ICommand IncreaseCount { get; }
public CoffeeEquipmentViewModel()
{
IncreaseCount = new Command(onIncrease);
}
private void onIncrease()
{
count++;
CountDisplay = $"{count.ToString()} times";
}
}
}
Better MVVM with MVVM Helpers (or Xamarin Community Toolkit
- 00:00 – Introduction
- 01:30 – MVVM Helpers – What & Install NuGet
- 05:00 – Upgrading with ObservableObject & BaseViewModel
- 10:30 – AsyncCommand
- 12:00 – ObservableRangeCollection
- 17:00 – Xamarin Community Toolkit
MVVM Helpers – What & Install NuGet
- Why? remove dependency to Xamarin (testing, reusability, etc.)
- Vanilla-oriented MVVM framework (alternative to MVVMCross, Prism, etc.
System.Windows.Input.Command >>> MvvmHelpers.Commands.Command
MvvmHelpers.Commands.AsyncCommand
MvvmHelpers.ObservableObject
private string countDisplay = "Click me to start";
public string CountDisplay
{
get => countDisplay;
set => SetProperty(ref countDisplay, value);
}System.Collections.ObjectModel.ObservableCollection >>> MvvmHelpers.ObservableRangeCollection
MvvmHelpers.BaseViewModel
Xamarin Community Toolkit
https://docs.microsoft.com/en-us/xamarin/community-toolkit/