Xamarin.Forms Advanced Topics
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The document discusses advanced topics in Xamarin.Forms including data template selectors, themes/styles, behaviors, triggers, renderers, effects, dependency services, platform-specifics, and the visual state manager. Data template selectors allow choosing templates at runtime based on data. Styles customize control appearance by grouping properties. Behaviors add functionality without subclassing. Triggers change appearance based on events. Renderers and effects customize native controls. Dependency services access native functionality. Platform-specifics consume platform-only features. The visual state manager structurally changes the UI from code.
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Xamarin.Forms Advanced Topics
- 2. Agenda • DataTemplate Selector • Themes / Styles • Behaviors • Triggers • Renderers - Effects • Dependency Service • Platform-Specifics • Visual State Manager
- 3. DataTemplate Selector • A DataTemplateSelector can be used to choose a DataTemplate at runtime based on the value of a data-bound property. This enables multiple DataTemplates to be applied to the same type of object in order to customize the appearance of select objects.
- 4. Themes / Styles • Xamarin.Forms applications often contain multiple controls that have an identical appearance. Setting the appearance of each individual control can be repetitive and error prone. Instead, styles can be created that customize control appearance by grouping and settings properties available on the control type.
- 5. Behaviors • Behaviors lets you add functionality to user interface controls without having to subclass them. Behaviors are written in code and added to controls in XAML or code.
- 6. Triggers • Triggers allow you to express actions declaratively in XAML that change the appearance of controls based on events or property changes. • You can assign a trigger directly to a control, or add it to a page-level or app-level resource dictionary to be applied to multiple controls.
- 7. Renderers - Effects • Renderers: Xamarin.Forms user interfaces are rendered using the native controls of the target platform, allowing Xamarin.Forms applications to retain the appropriate look and feel for each platform. Custom Renderers let developers override this process to customize the appearance and behavior of Xamarin.Forms controls on each platform. • Effects: Xamarin.Forms user interfaces are rendered using the native controls of the target platform, allowing Xamarin.Forms applications to retain the appropriate look and feel for each platform. Effects allow the native controls on each platform to be customized without having to resort to a custom renderer implementation.
- 9. Dependency Service • Xamarin.Forms allows developers to define behavior in platform- specific projects. DependencyService then finds the right platform implementation, allowing shared code to access the native functionality.
- 10. Platform-Specifics • Platform-specifics allow you to consume functionality that's only available on a specific platform, without implementing custom renderers or effects.
- 11. Visual State Manager • The VSM provides a structured way to make visual changes to the user interface from code. In most cases, the user interface of the application is defined in XAML, and this XAML includes markup describing how the Visual State Manager affects the visuals of the user interface.
- 12. References • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app- fundamentals/templates/data-templates/selector • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user- interface/styles/xaml/ • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app- fundamentals/behaviors/ • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app- fundamentals/triggers • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app- fundamentals/custom-renderer/
- 13. References • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app- fundamentals/effects/ • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app- fundamentals/dependency-service/introduction • https://docs.microsoft.com/en-us/xamarin/xamarin- forms/platform/platform-specifics/ • https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user- interface/visual-state-manager
- 14. Questions? Alejandro Ruiz Microsoft MVP: Developer Technologies Xamarin.Forms Advanced Topics DEMO: https://github.com/AlejandroRuiz/AdvancedTopicsCommunityAnniversary [email protected] https://alejandroruizvarela.blogspot.mx @alejandroruizva