Twilio’s Programmable Video SDK for iOS is based upon a fork of the Chromium WebRTC project (webrtc.org). This heritage presents an interesting challenge when using other WebRTC dependencies alongside Twilio in your iOS application.
If you use the WebRTC Objective-C APIs or another Chromium WebRTC based SDK, please read on to learn how you can eliminate class conflicts with Twilio Video.
How do conflicts occur?
Objective-C does not support the concept of namespaces. Instead, developers typically use a 3-4 letter prefix to uniquely identify their classes. WebRTC classes are prefixed with
RTC, while Twilio Video classes are prefixed with
Consider the following Podfile which consumes both Twilio Video and WebRTC.
source 'https://github.com/CocoaPods/Specs' target 'TARGET_NAME' do platform :ios, '9.0' pod 'TwilioVideo', '2.2.2' pod 'GoogleWebRTC' end
Some classes with the
RTC prefix are present both in WebRTC (publicly) and in Twilio Video (privately). When classes are loaded by the Objective-C runtime, any conflicts which occur are raised in your console logs:
You can see that classes like
RTCAudioSession are provided by both libraries. When classes conflict at runtime, the version which is loaded is undefined. This could result in unexpected behavior or crashes in your application.
How do I resolve class conflicts?
One technique used to resolve class conflicts is to rename (prefix) the impacted classes. As of version 2.3.0, Twilio Video now prefixes
RTC classes with
TVI. For example,
RTCAudioSession now becomes