# protocolType The communication protocol that this extension implements. ``` @MainActor var protocolType: UTType { get } ``` ## Declaring the Protocol Type Declare a custom Uniform Type Identifier in your extension’s Info.plist using `UTExportedTypeDeclarations`. The type must conform to `public.media-sharing-protocol`: ```xml UTExportedTypeDeclarations UTTypeIdentifier com.example.sharingprotocol UTTypeDescription My Sharing Protocol UTTypeConformsTo public.media-sharing-protocol UTTypeIcons UTTypeSymbolName sharingprotocol.logo ``` - `UTTypeIdentifier`: A reverse-DNS string that uniquely identifies your protocol. Media apps receive this value through `AVSystemRoute/protocolType` and use it to determine which protocol is active. - `UTTypeDescription`: A human-readable name for the protocol. The system may display this in user interfaces such as the route picker. - `UTTypeConformsTo`: Must include `public.media-sharing-protocol`. ## Returning the Type Return a `UTType` whose identifier matches the `UTTypeIdentifier` declared in Info.plist: ```swift var protocolType: UTType { UTType("com.example.sharingprotocol")! } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)