ios - CGLayer、CALayer和CGContext的区别
<p><p>CGLayer、CALayer、CGContext有什么区别？ </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>所以，正如文档所说</p>
<p><code>QuartzCore 框架</code>中的<strong>CALayer</strong>是</p>
<blockquote>
<p>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.</p>
</blockquote>
<p>更多信息请查看<a href="https://developer.apple.com/reference/quartzcore/calayer" rel="noreferrer noopener nofollow">https://developer.apple.com/reference/quartzcore/calayer</a> </p>
<p><code>Core Graphics framework</code>中的<strong>CGLayer</strong>是</p>
<blockquote>
<p>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)</p>
</blockquote>
<p>更多信息请查看<a href="https://developer.apple.com/reference/coregraphics/1666309-cglayer" rel="noreferrer noopener nofollow">https://developer.apple.com/reference/coregraphics/1666309-cglayer</a> </p>
<blockquote>
<p>Note CGLayer objects are unrelated to Core Animation layers (CALayer
objects).</p>
</blockquote>
<code>Core Graphics framework</code> 中的 <p><strong>CGContext</strong> 是 </p>
<blockquote>
<p>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.</p>
</blockquote>
<p>更多信息请查看<a href="https://developer.apple.com/reference/coregraphics/1666363-cgcontext" rel="noreferrer noopener nofollow">https://developer.apple.com/reference/coregraphics/1666363-cgcontext</a> </p></p>
<p style="font-size: 20px;">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：
<a href="https://stackoverflow.com/questions/39695032/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/39695032/
</a>
</p>
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