Detailed explanation of iOS layer with core animation

Core Animation

• Core Animation, translated into Chinese as Core Animation, is a set of very powerful animation processing APIs, which can make very dazzling animation effects, and often get twice the result with half the effort. In other words, very powerful functions can be achieved with a small amount of code.
• Core Animation can be used on Mac OS X and iOS platforms.
• The animation execution process of Core Animation is performed in the background without blocking the main thread.
• It should be noted that Core Animation acts directly on CALayer, not UIView.

For details, please refer to https://www.jianshu.com/p/8a0f5019d33c