ios - CGLayer、CALayer和CGContext的区别

CGLayer、CALayer、CGContext有什么区别？

---

Best Answer-推荐答案

所以，正如文档所说

QuartzCore 框架中的CALayer是

The CALayer class manages image-based content and allows you to perform animations on that content. Layers are often used to provide the backing store for views but can also be used without a view to display content.

更多信息请查看https://developer.apple.com/reference/quartzcore/calayer

Core Graphics framework中的CGLayer是

Layer objects are useful for offscreen drawing and can be used in much the same way that a bitmap context can be used. In fact, a CGLayer object is a much better representation than a bitmap context. Using CGLayer objects can improve performance, particularly when you need to capture a piece of drawing that you stamp repeatedly (using the same scale factor and orientation)

更多信息请查看https://developer.apple.com/reference/coregraphics/1666309-cglayer

Note CGLayer objects are unrelated to Core Animation layers (CALayer objects).

Core Graphics framework 中的

CGContext 是

A graphics context contains drawing parameters and all device-specific information needed to render the paint on a page to the destination, whether the destination is a window in an application, a bitmap image, a PDF document, or a printer.

更多信息请查看https://developer.apple.com/reference/coregraphics/1666363-cgcontext

关于ios - CGLayer、CALayer和CGContext的区别，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39695032/