Retina显示核心图形字体质量 [英] Retina display core graphics font quality

问题描述

试图理解为什么我使用CGContextShowTextAtPoint获得低质量的绘图？见附图：

Trying to understand why am I getting low quality drawing with CGContextShowTextAtPoint? See attached image:

字母W是在CALayer上使用CGContextShowTextAtPoint绘制的，看起来非常像素化。它旁边的按钮是一个标准按钮，按预期看起来很高。我想让文字绘图成为高分辨率。

The letter "W" is drawn using CGContextShowTextAtPoint on a CALayer and looks very pixelized. The button next to it is a standard button and looks high res as expected. I would like to get the text drawing to be hi-res.

推荐答案

默认情况下，您的CALayer不会以更高的分辨率渲染其Quartz内容Retina显示屏。你可以使用如下代码启用它：

By default, your CALayer is not rendering its Quartz content at the higher resolution of the Retina display screen. You can enable this using code like the following:

if ([layer respondsToSelector:@selector(setContentsScale:)])
{
    layer.contentsScale = [[UIScreen mainScreen] scale];
}

这不仅会影响文本渲染，还会影响CALayers中的所有Quartz绘图，因此您需要使用自定义Quartz内容为所有图层执行此操作。

This will affect not just text rendering, but all of your Quartz drawing within CALayers, so you'll need to do this for all of your layers with custom Quartz content.

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