Tracking user behaviour with ImpressionKit & SwiftHook for method swizzling ...
summary
Shows an actual hooking library that uses runtime subclassing and method swizzling to intercept methods for single objects or whole classes and demos changing a function result from ABC to 123, explains how SwiftHook creates a dynamic subclass and uses libffi to call original IMPs, and presents ImpressionKit that computes view frames in window space, runs a periodic timer to measure on‑screen dwell time, and stops timers in didMoveToWindow for real world performance savings
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