Optimizing and Extending Xamarin.Forms iOS, Android, and UWP Apps
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Xamarin.Forms helps you build a native UI for three platforms with one shared C# codebase. Simply put, if you know C# then you already know how to build iOS, Android, and Windows apps. Leverage the .NET Framework to build out your shared business logic including integration with web services and Azure Mobile Apps and then build out your shared UI in C# or XAML. Xamarin.Forms also features a built-in two-way data binding, dependency service to help you implement platform-specific code, an advanced cross-platform animation system, support for custom controls, and lots of other powerful features to help you build the best apps possible in the least amount of time. This session will focus on the latest developments in Xamarin.Forms that will help you share more code and build more beautiful apps in less time. You will look at Custom Renders, Effects, Platform Specifics, Bindable Native Views, the Xamarin.Forms previewer, and more. You'll also look at tweaking and tuning your Xamarin.Forms applications for the best performance possible.
![XAML Compilation Usage
At assembly level:
[XamlCompilation(XamlCompilationOptions.Compile)]
[XamlCompilation(XamlCompilationOptions.Skip)]
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
At class level:](https://image.slidesharecdn.com/xamarin-formsextendandoptimize-180524142741/85/Optimizing-and-Extending-Xamarin-Forms-iOS-Android-and-UWP-Apps-16-320.jpg)
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Optimizing and Extending Xamarin.Forms iOS, Android, and UWP Apps
- 2. James Montemagno Principal Program Manager – Mobile Developer Tools, Microsoft [email protected] Montemagno.com @JamesMontemagno Weekly development podcast mergeconflict.fm Weekly development show xamarinshow.com
- 3. iOS C# UI Windows C# UIAndroid C# UI Shared C# logic Xamarin’s unique approach Shared C# codebase • 100% native API access • High performance
- 4. Build native UIs for iOS, Android, and Windows from a single, shared C# codebase. Meet Xamarin.Forms
- 5. Xamarin + Xamarin.Forms Traditional Xamarin approach With Xamarin.Forms: More code-sharing, all native iOS C# UI Windows C# UIAndroid C# UI Shared C# Logic Shared C# Logic Xamarin.Forms
- 6. What’s included ✓ 40+ Pages, layouts, and controls (Build from code behind or XAML) ✓ Two-way data binding ✓ Navigation ✓ Animation API ✓ Dependency Service ✓ Messaging Center Shared C# Logic Shared UI Code
- 7. Pages Stack Absolute Relative Grid ContentView ScrollView Frame Content MasterDetail Navigation Tabbed Carousel Layouts
- 8. ActivityIndicator BoxView Button DatePicker Editor Entry Image Label ListView Map OpenGLView Picker ProgressBar SearchBar Slider Stepper TableView TimePicker WebView EntryCell ImageCell SwitchCell TextCell ViewCell Controls
- 9. Xamarin & Xamarin.Forms ecosystem
- 10. Native UI from shared code <?xml version="1.0" encoding="UTF-8"?> <TabbedPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="MyApp.MainPage"> <TabbedPage.Children> <ContentPage Title="Profile" Icon="Profile.png"> <StackLayout Spacing="20" Padding="20" VerticalOptions="Center"> <Entry Placeholder="Username" Text="{Binding Username}"/> <Entry Placeholder="Password" Text="{Binding Password}" IsPassword="true"/> <Button Text="Login" TextColor="White" BackgroundColor="#77D065" Command="{Binding LoginCommand}"/> </StackLayout> </ContentPage> <ContentPage Title="Settings" Icon="Settings.png"> <!-- Settings --> </ContentPage> </TabbedPage.Children> </TabbedPage>
- 13. Messaging Center ▪ Master Page: ▪ Detail Page:
- 15. XAML Compilation XAMLCXAML Parsed and inflated Parsed & turned into IL
- 16. XAML Compilation Usage At assembly level: [XamlCompilation(XamlCompilationOptions.Compile)] [XamlCompilation(XamlCompilationOptions.Skip)] [assembly: XamlCompilation(XamlCompilationOptions.Compile)] At class level:
- 18. • Image Loading & Caching • Trimmed down just for Images Introducing GlideX.Forms http://jonathanpeppers.com/Blog/glidex-forms---fast-images-for-xamarin-forms-on-android
- 19. • Web Urls • Files on disk • Android resources (drawables) • Byte array ( Install NuGet & Init
- 21. ListView CachingStrategy ✓ Improves scrolling performance ✓ RetainElement is currently the default
- 23. Data Templates
- 27. • Extend Forms functionality • Platform-specific implementations • Customize an existing control or write your own Custom Renderers
- 28. • Custom page (subclass PageRenderer) • Circle Image (subclass ImageRenderer) • Calendar (subclass ViewRenderer) Custom Renderers - Examples
- 29. Effects ✓ Custom renderer “lite” ✓ Change properties on the native control ✓ Optional ✓ “stringly-typed” X No methods or events X No replacing the control
- 30. Effects
- 34. iOS Large Titles Platform Specifics C# XAML
- 35. Built-in UI Tweaks Platform Specifics
- 36. Access Native Features Easily Dependency Service
- 37. It is really fast! Dependency Service https://xamarinhelp.com/ioc-container-performance/
- 38. Shared C# Backend User Interface User Interface User Interface Geolocation Geolocation Geolocation Compass Compass Compass Keystore Keystore Keystore
- 59. Xamarin.Forms Shared C# Logic Windows C#Android C#iOS C#
- 68. soundbite.fm
- 70. Thank you. James Montemagno Principal Program Manager – Mobile Developer Tools, Microsoft [email protected] Montemagno.com @JamesMontemagno Weekly development podcast mergeconflict.fm Weekly development show xamarinshow.com