What iOS SDK's are available?

I’m an iOS developer and new to Asterisk. We have a server running already and it works great on our web app. I need to use it on our native iOS app as well. Are there any great SDK’s, cocoapods or otherwise available? Ideally I’d love to connect to the server using URLSessionWebSocketTask, but I can’t find how to properly make that connection. Any help is appreciated. Thank you!