CATiledLayer:渲染可缩放的 PDF 页面 - 什么是“LevelsOfDetail"?和“LevelsOfDetailBias"? [英] CATiledLayer: Render zoomable PDF Page - what are "LevelsOfDetail" and "LevelsOfDetailBias"?

问题描述

我做了一个小演示，用于查看可缩放的 PDF 页面.基本上，我在 http://www.olivetoast.com/blog/2009/08/simple-uiscrollview-catiledlayer-pdf-example/.

I made a little demo for viewing a PDF page which is zoomable. Basically, I MonoTouched the example at http://www.olivetoast.com/blog/2009/08/simple-uiscrollview-catiledlayer-pdf-example/.

您可以在我的博客中找到我的版本 http://www.wildsau.net/post/2011/02/28/Simple-UIScrollView-CATiledLayer-PDF-Example-%28MonoTouch-version%29.aspx

You can find my version in my blog at http://www.wildsau.net/post/2011/02/28/Simple-UIScrollView-CATiledLayer-PDF-Example-%28MonoTouch-version%29.aspx

但是，我一直无法弄清楚 CATiledLayer 的LevelsOfDetail"和LevelsOfDetailBias"属性的用途.我可以设置任何值组合并且无法发现差异.Apple 在属性上的帮助并没有向我解释任何事情.

However, I have not been able to figure out what "LevelsOfDetail" and "LevelsOfDetailBias" properties of CATiledLayer are for. I can set any value combination and cannot spot a difference. Apple's help on the properties doesn't explain anything to me.

有人可以解释一下吗?

推荐答案

此链接 对 levelsOfDetail 有很好的解释.这里您可以找到对levelsOfDetailBias的正确解释.

This link has a pretty good explanation of levelsOfDetail. Here you can find a decent explanation of levelsOfDetailBias.

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