Debugging in Xcode
Xcode provides a powerful debugging interface and the new state-of-the-art LLDB debugger. Discover how you can better track the value of your variables, better debug multithreaded applications, and find and fix issues faster than ever. Join the Xcode engineering team for an in-depth look at the Xcode debugger and LLDB.
WWDC 2012 - Session 412 - iOS, macOS