I'm back in Objective-C now for a large mixed codebase for a client and enjoying it. It was my first compiled language starting in 2002 so I've got about equal time with only it as I do with Swift alongside. And I'm spending more time these days in other projects (microcontrollers, mostly) using C so it's a breath of fresh air. I'm finding it generally faster than Swift in Xcode, which is a bonus.