Firebase Docs Reference FirebaseInvites Framework Reference Protocols The following protocols are available globally. InviteDelegate The protocol to receive the result of the invite action. Declaration Swift protocol InviteDelegate : NSObjectProtocol InviteBuilder The protocol to configure the invite dialog. Declaration Swift protocol InviteBuilder : NSObjectProtocol Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated May 21, 2018.