This old-school object browser can parse, extremely fast, targets in both Objective-C and Swift. It can be used to track unused code and display graphical view of code layout in a single or multiple targets at once.
The dynamic tokenizer works on a need-to basis, allowing for blazing fast code traversal.
This tool was developed in-house for the sole purpose of debugging.

This demonstration shows XCodeMaster inspecting it’s own sources, but was also used on hundreds of file projects (when I worked at Oracle) with the same performance results.
Swift 5+ is now supported after Apple changed the compiler AST output.