CALayer 的目的? [英] Purpose of CALayer?

问题描述

我对 CALayer 存在的目的是什么有点习惯了.为什么不直接将属性放在 UIView 中?

I'm slightly used as to what the purpose of CALayer's existence is. Why not just put the properties in a UIView?

谢谢.

推荐答案

CALayer 代表与 UIView 完全不同的事物".CALayer 只处理绘图本身，并封装执行此操作所需的信息.另一方面，视图拥有一个或多个图层，用于绘制自身.但是，视图还有许多其他功能和属性，这些功能和属性与其在屏幕上的表示无关.

A CALayer represents a completely different "thing" from a UIView. A CALayer only deals with drawing itself, and encapsulating the information needed to do that. A view, on the other hand, owns one or many layers, which it uses to draw itself. A view has many other functions and properties though, that are unrelated to its representation on the screen.

我建议深入研究 Apple 文档，也许还可以找一本关于面向对象编码的书.

I would recommend digging into the Apple documentation, and maybe picking up a book on Object Oriented coding.

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