debugging-instruments

What problem does it solve?

This Skill helps developers diagnose and fix issues in iOS applications, including crashes, memory leaks, performance bottlenecks, and build failures.

Core Features & Use Cases

• LLDB Debugging: Utilize powerful command-line debugging for breakpoints, variable inspection, and expression evaluation.
• Memory Debugging: Employ the Memory Graph Debugger and Instruments to find and fix memory leaks and retain cycles.
• Performance Profiling: Use Instruments (Time Profiler, Allocations, etc.) to identify and resolve performance issues like hangs and slow rendering.
• Build Failure Triage: Understand and resolve compiler errors and dependency issues.
• Use Case: When an app crashes unexpectedly on launch, use LLDB to set a symbolic breakpoint on -[UIApplication main] and inspect the call stack to understand the cause.

Quick Start

Use LLDB to set a breakpoint at line 42 in ViewModel.swift and print the value of the 'count' variable.