# AppExtensionPoint.Bind A property wrapper that binds an app extension to an extension point of a host app. ``` @resultBuilder struct Bind ``` ## Overview Apply this property wrapper to a variable that contains an [`AppExtensionPoint`](/documentation/ExtensionFoundation/AppExtensionPoint) type. Use the variable to define the extension point that your app extension supports. An app extension can bind to only one extension point in a host app. When configuring the [`AppExtensionPoint`](/documentation/ExtensionFoundation/AppExtensionPoint) type for your variable, specify the host app and extension point details using an [`AppExtensionPoint.Identifier`](/documentation/ExtensionFoundation/AppExtensionPoint/Identifier) type. The following example shows how to create the variable in your app extension, specify the extension point you want, and create the binding: ``` struct MyAppExtension: AppExtension { @AppExtensionPoint.Bind var extensionPoint: AppExtensionPoint { AppExtensionPoint.Identifier("com.example.hostapp”, name “HostAppFeature”) } } ``` To ensure the system discovers your app extension’s bindings, add a user-defined build setting to your app extension target in Xcode. Set the build setting name to `EX_ENABLE_EXTENSION_POINT_GENERATION` and configure it with a value of `YES`. When this setting is present, the compiler places the necessary binding information in your app extension’s `Info.plist` file. ## Topics ### Annotating a binding [`static func buildBlock(AppExtensionPoint.Identifier) -> AppExtensionPoint`](/documentation/ExtensionFoundation/AppExtensionPoint/Bind/buildBlock(_:)) Passes an identifier to the extension point type. ### Type Methods [`static func buildBlock(AppExtensionPoint.Identifier, AppExtensionPoint.Capabilities) -> AppExtensionPoint`](/documentation/ExtensionFoundation/AppExtensionPoint/Bind/buildBlock(_:_:)) --- 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)