Debugging & Instruments (iOS / macOS)

Interactive debugging and performance profiling for a fintech iOS app: pause and inspect with LLDB, find leaks and retain cycles with the Memory Graph Debugger, and measure CPU / memory / hangs / hitches / energy / network with Instruments. Grounded in the LLDB, Xcode, Instruments, and os (unified logging) tooling. Target: iOS 26 era, Xcode 26.

• Production counterpart: metrickit — the field version of these signals (hangs, disk-writes, launch time, crashes) sampled from real users. Debug locally here; regress in CI/production there.
• SwiftUI update traces: swiftui-expert-skill owns deep .trace analysis of the SwiftUI instrument (View Body / Properties / Core Animation commits).
• Simulator control: ios-simulator (simctl) to install/launch/deep-link/screenshot the target you profile.
• Android/KMP counterpart: perfetto-trace-analysis (+ perfetto-sql) for the shared/Android side.

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