# ConnectionHandler A type that contains a custom closure that handles incoming XPC connections. ``` @MainActor @preconcurrency struct ConnectionHandler ``` ## Overview This type manages a closure in your app extension that accepts incoming XPC connections from a host app. Create an instance of this structure and initialize it with a closure for the type of XPC connection the host app uses with app extensions. Assign the instance you created to the [`configuration`](/documentation/ExtensionFoundation/AppExtension/configuration-swift.property) property of your custom [`AppExtension`](/documentation/ExtensionFoundation/AppExtension) type. When the host app tries to open a connection, the system runs your closure to accept that connection. Use this type to establish connections with either the or framework. ## Topics ### Initializing the connection handler [`init(onConnection: (NSXPCConnection) -> Bool)`](/documentation/ExtensionFoundation/ConnectionHandler/init(onConnection:)) Initializes the connection handler with a closure that accepts a Foundation XPC object. [`init(onSessionRequest: (XPCListener.IncomingSessionRequest) -> XPCListener.IncomingSessionRequest.Decision)`](/documentation/ExtensionFoundation/ConnectionHandler/init(onSessionRequest:)) Initializes the connection handler with a closure that accepts an XPC session. ## Relationships ### Conforms To [`AppExtensionConfiguration`](/documentation/ExtensionFoundation/AppExtensionConfiguration) [`Sendable`](/documentation/Swift/Sendable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- 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)