UIScrollView中的核心文本段落模糊 [英] Core Text paragraph inside a UIScrollView is blurry

问题描述

我尝试在UIScrollView内部的视图中将较长的段落绘制为NSAttributedString。奇怪的是，该段的顶部不是模糊的，但是我越滚动到底部，它就会变得模糊！我非常了解Quartz和floats可能存在的小问题，因此我尝试将视图的框架设置为以下0.5点。现在我的段落的顶部很模糊，底部的很正常（！）我真的不知道如何解决这个问题，将不胜感激！

I tried drawing a long paragraph as an NSAttributedString in a view inside a UIScrollView. Weird thing is, the top of the paragraph is not blurry, but the more I scroll to the bottom the blurrier it gets ! I am well aware of the small issues you can have with Quartz and floats, therefore I tried to set the frame of the view 0.5 points below. Now the top of my paragraph is blurry, and the bottom is OK (!) I really don't know how to fix this, and would appreciate any help !

谢谢您！

推荐答案

与模糊文本有关的每个问题始终与将文本放置在子目录中有关-像素偏移。在某个地方，您的职位可能不是整数，应该向上或向下取整。您可能要检查的地方：

Every problem I've had to do with blurry text has always been to do with positioning the text at a sub-pixel offset. Somewhere, you probably have a position that isn't a whole number, and you should round it up or down. Places you might want to check:

• UIScrollView
  
• 滚动视图的contentOffset


• 在其中覆盖 drawRect 的视图的位置


• 您为CoreText调用实际绘制的矩形（路径）

• The position of your UIScrollView
• The contentOffset of your scroll view
• The position of the view that you override drawRect in
• The rect (path) that you actually draw into for your CoreText calls

我意识到这个问题已有几个月的历史了，但无论如何还是要回答一个问题！

I realise that this question is a few months old, but though it would be useful to have an answer anyway!

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