幻化成疯

摘要： 在网上经常看到关于layer的tree的描述，不太理解，今天找到了官方文档，原文在Core Animation Programming Guide 中。Layer Trees Reflect Different Aspects of the Animation StateAn app using Core Animation has three sets of layer objects. Each set of layer objects has a different role in making the content of your app appear onscreen:Object 阅读全文

摘要： 与动画有关的几个类的继承关系涉及到动画的类主要有6个，看一下它们的基本用途：1. CAAnimation动画基类2. CAAnimationGroup组合多个动画3. CAPropertyAnimationCAPropertyAnimationis an abstract subclass ofCAAnimationfor creating animations that manipulate the value of layer properties. The property is specified using a key path that is relative to the lay 阅读全文