Sohu Tech Products
Sep 11, 2019 · Mobile Development
Understanding and Reimplementing Apple's Main Thread Checker on iOS
This article explores Apple's libMainThreadChecker.dylib implementation, details its environment variables and swizzling logic, demonstrates how to replicate its functionality by enumerating UIKit classes and hooking methods, and discusses pitfalls of full‑method hooking and a bridge‑based solution for reliable runtime monitoring.
Main Thread CheckerMethod SwizzlingObjective-C
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