Debugging Instruments

You'll reach for this when your iOS app is crashing, leaking memory, or freezing the UI and you need to figure out why. It covers the practical LLDB commands for debugging, walks through finding retain cycles with the Memory Graph Debugger, and shows how to use Instruments to profile CPU and memory. The retention cycle examples are particularly helpful, covering the classic mistakes like closures capturing self strongly and Timer targets. It also includes hang diagnostics with Time Profiler and covers build failure triage. Good for intermediate developers who know the tools exist but want efficient workflows and common patterns to look for.