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The article introduces a lightweight, protocol‑oriented iOS animation framework that uses type erasure and declarative animators to replace nested callback code, providing simple factory methods, serial and parallel execution support, and clearer, more maintainable animation sequences.
The article compares the view‑and‑layer tree architectures of iOS, Android, Web, and Flutter, explaining iOS’s UIView/CALayer hierarchy, coordinate system, and model‑presentation‑render trees, while detailing Flutter’s widget, element, render‑object, and layer trees, and highlighting their shared parse‑layout‑render pipeline and differing animation approaches.
This article explains how iOS generates a touch event, encapsulates it in UITouch and UIEvent objects, propagates it through UIApplication to the view hierarchy using hitTest and pointInside, and finally processes it via UIResponder methods and the responder chain.
This article explains how iOS CoreAnimation works behind UIView animations, detailing the role of CALayer, the actionForLayer:forKey: delegate method, animation overlapping behavior, and the distinction between presentationLayer and modelLayer during screen refreshes.