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www.bestppt.com
Playtime is over building real-world apps with Xamarin.Forms
28 January 2017
Who is that handsome gentleman anyways?
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Gerald Versluis@jfversluis
blog.verslu.is
Feel free to ask
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Gerald Versluis@jfversluis
blog.verslu.is
What I have for you today…
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1 What does it look like? What does it do?The end result
2 What is the structure behind it? What concepts are used?
Architecture
3 What you are here for anyway, demo time!Code
4 Not to miss NuGets for developing with Xamarin
There’s a NuGet for that…
5 Summary, thank you, high fives all aroundIt’s a wrap
The end result
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BudgetGaming
budgetgaming.nl
• Available in the App Store • Built with Xamarin.Forms • ~1000 users per month
www.bestppt.com
Architecture Great! But what does it look like in diagrams?
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MVVM
• Model–view–viewmodel • Architectural pattern • Inspired by MVC • Databinding &
Commanding • Uses XAML as binder
Architecture - continued
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Why MVVM?
ViewView markup code
WinForms, XAML, CSHTML, etc.
Code-behind
Model
• Hard to test • UI and logic is tightly
coupled
Architecture - continued
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That’s why MVVM!
ViewView markup code
WinForms, XAML, CSHTML, etc.
Code-behind
ModelViewModel
Databinding
& Commands
PropertyChanged
Easy to combine with Dependency Injection
Architecture - continued
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Databinding
• Crucial for MVVM • Normal class, normal properties • Assign to DataContext property • Implement INotifyChanged • One-way or two-way
Architecture - continued
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Commands
• Instead of Events • Executes logic • Bindable • Implements ICommand
• Execute • CanExecute • CanExecuteChanged
Architecture - continued
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FreshMvvm
• Very light-weight • Built with Xamarin.Forms in mind • PageModel to PageModel navigation • Built-in IoC • Open-source (github.com/rid00z/FreshMvvm) • MvvmCross, Prism, Light Mvvm …
Architecture - continued
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BudgetGaming Website/API
BudgetGaming App
UI iOS
UI Xamarin.Forms
UI Android
ViewModels
Service(s)
Models
Shared code
Architecture - continued
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Shared code
Portable Class Library Shared Project .NET Standard
Architecture - continued
www.bestppt.com
There’s a NuGet for that… With these NuGets your life will be a lot easier
NuGet packages to make all of our lives easier!
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Xamarin.Plugins.Settings Simple type (user) settings
Xamarin.Plugins.Connectivity Network connectivity
ACR.UserDialogs Alerts, loading, ActionSheets
FreshMvvm Lightweight, easy to use MVVM framework
PropertyChanged.Fody INotifyPropertyChanged made easy
FFImageLoading Image caching, effects, etc.
Polly Fluent exception handling
Refit Type-safe REST library
Note: install on both PCL and platform project
www.bestppt.com
It’s a wrap Just one more slide
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• MVVM is awesome • Better testability • Better maintainability • Clean architecture allows better
code sharing
In short…
#shamelessselfpromotion
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Gerald Versluis@jfversluis
blog.verslu.is
github.com/jfversluis
