ARCHIVE · 03
Follow the trail from foundational concepts to practical engineering decisions.
Method calls compile as direct calls, vtable lookups, or objc_msgSend. This article explains why final and private improve performance, the trap in protocol extensions, and how to verify it with a profiler.
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The moment you attach an observer, KVO dynamically swaps the object's class with a subclass. This covers isa-swizzling, why class lies, and when notifications are not sent without going through the setter.
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Claude Code plan mode requires approval of a plan before changing code. This covers enabling it with Shift+Tab or /plan, the three approval options, editing plans with Ctrl+G, and setting defaults.
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Test Plans manage the tests to run and their execution conditions in .xctestplan files. This guide covers why schemes alone are insufficient, test selection, configurations, coverage, execution order, repetition, and xcodebuild integration.
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Structured concurrency answers who is responsible for ending asynchronous work. This article covers why child tasks cannot escape their parent scope, how cancellation propagates, and which guarantees you must manually reclaim with Task.detached.
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