Add templates for app extensions

[rolfbjarne]

We need templates for app extensions.

Pending: list all the app extensions by estimated usage to have a prioritized list of templates to implement.

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List of templates (unsorted)

iOS

• Audio Unit (com.apple.AudioUnit)

  We don't have any existing templates for this extension.

• Audio Unit (com.apple.AudioUnit-UI)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/ActionExtension

• Authentication Services (com.apple.authentication-services-credential-provider-ui)

  We don't have any existing templates for this extension.

• Call Directory (com.apple.callkit.call-directory)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/CallDirectoryExtension

• File Provider (com.apple.fileprovider-nonui)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/DocumentPickerFileProviderExtension

• Document Picker (com.apple.fileprovider-ui)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/DocumentPickerExtension

• Intents (com.apple.intents-service)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/IntentsExtension

• Intents UI (com.apple.intents-ui-service)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/IntentsUIExtension

• Custom Keyboard (com.apple.keyboard-service)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/CustomKeyboardExtension

• Message (com.apple.message-payload-provider)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/MessageExtension

• Network Extension (com.apple.networkextension.packet-tunnel)

  We don't have any existing templates (although there have been bug reports
  about these extensions, so some people are creating them).

• Photo Editing (com.apple.photo-editing)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/PhotoEditingExtension

• Content Blocker (com.apple.Safari.content-blocker)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/ContentBlockerExtension

• Shared Links (com.apple.Safari.sharedlinks-service)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/SharedLinksExtension

• com.apple.services

  We don't have any existing templates for this extension.

• Share (com.apple.share-services)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/ShareExtension

• Spotlight Index (com.apple.spotlight.index)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/SpotlightIndexExtension

• Action Extension (com.apple.ui-services)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/ActionExtension

• Notification Content (com.apple.usernotifications.content-extension)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/NotificationContentExtension
  • [dotnet] Add templates for Notification Content extensions and Notification Service extensions. #21886

• Notification Service (com.apple.usernotifications.service)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/NotificationServiceExtension
  • [dotnet] Add templates for Notification Content extensions and Notification Service extensions. #21886

• (com.apple.watchkit)

  N/A to .NET

• Today (com.apple.widget-extension)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/TodayExtension

tvOS

• Broadcast Upload / UI (com.apple.broadcast-services)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/BroadcastUIExtension
  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.IPhone/MonoDevelop.IPhone/templates/Xamarin.iOS/Project/BroadcastUploadExtension

• (com.apple.tv-services)

• Top Shelf Extension (com.apple.tv-top-shelf)

  • Working sample project: https://github.com/user-attachments/files/22771410/TvShelfBug-DotNetWorking.zip (from Exception When Using tvOS TVTopShelfContentProvider #13260 (comment)), which can be used as a starting point for the template.

macOS

• FinderSyncExtension (com.apple.FinderSync)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.MonoMac/MonoDevelop.MonoMac/templates/XamMac2/Projects/FinderSyncExtension

• ShareExtension (com.apple.share-services)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.MonoMac/MonoDevelop.MonoMac/templates/XamMac2/Projects/ShareExtension

• TodayExtension (com.apple.widget-extension)

  • https://github.com/xamarin/vsmac-xamarin-extensions/tree/47507384987d5522983bce0d92afb799b96b5a96/MonoDevelop.MonoMac/MonoDevelop.MonoMac/templates/XamMac2/Projects/TodayExtension

• Network Extension (com.apple.networkextension.packet-tunnel)

  We don't have any existing templates (although there have been bug reports
  about these extensions, so some people are creating them).

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Ref: #10747