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Uploaded byJames Montemagno
Optimizing and Extending Xamarin.Forms iOS, Android, and UWP Apps
James Montemagno, Principal Program Manager at Microsoft, discusses Xamarin and its unique approach of enabling developers to build native UIs for iOS, Android, and Windows from a shared C# codebase. The document outlines features of Xamarin.Forms, including over 40 pages of layouts and controls, data binding, and custom renderers. It emphasizes the benefits of sharing code while maintaining high performance and native API access across platforms.
Optimizing and Extending Xamarin.Forms iOS, Android, and UWP Apps
- 2. James Montemagno Principal Program Manager– Mobile Developer Tools, Microsoft motz@microsoft.com Montemagno.com @JamesMontemagno Weekly development podcast mergeconflict.fm Weekly development show xamarinshow.com
- 3. iOS C# UIWindows C# UIAndroid C# UI Shared C# logic Xamarin’s unique approach Shared C# codebase • 100% native API access • High performance
- 4. Build native UIsfor iOS, Android, and Windows from a single, shared C# codebase. Meet Xamarin.Forms
- 5. Xamarin + Xamarin.Forms TraditionalXamarin 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 RelativeGrid ContentView ScrollView Frame Content MasterDetail Navigation Tabbed Carousel Layouts
- 8. ActivityIndicator BoxView ButtonDatePicker Editor Entry Image Label ListView Map OpenGLView Picker ProgressBar SearchBar Slider Stepper TableView TimePicker WebView EntryCell ImageCell SwitchCell TextCell ViewCell Controls
- 9. Xamarin & Xamarin.Formsecosystem
- 10. Native UI fromshared 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 ▪ MasterPage: ▪ Detail Page:
- 15. XAML Compilation XAMLCXAML Parsed andinflated Parsed & turned into IL
- 16. XAML Compilation Usage Atassembly 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 ✓ Improvesscrolling performance ✓ RetainElement is currently the default
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- 27. • Extend Formsfunctionality • 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
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- 34. iOS Large Titles PlatformSpecifics C# XAML
- 35. Built-in UI Tweaks PlatformSpecifics
- 36. Access Native FeaturesEasily Dependency Service
- 37. It is reallyfast! Dependency Service https://xamarinhelp.com/ioc-container-performance/
- 38. Shared C# Backend UserInterface User Interface User Interface Geolocation Geolocation Geolocation Compass Compass Compass Keystore Keystore Keystore
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- 59. Xamarin.Forms Shared C# Logic WindowsC#Android C#iOS C#
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- 70. Thank you. James Montemagno Principal ProgramManager – Mobile Developer Tools, Microsoft motz@microsoft.com Montemagno.com @JamesMontemagno Weekly development podcast mergeconflict.fm Weekly development show xamarinshow.com