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Quartz 2D Programming Guide中有这样一段说明：

To set the font to a text encoding other than MacRoman, you can use the functions CGContextSetFont and CGContextSetFontSize. You must supply a CGFont object to the function CGContextSetFont. You call the function CGFontCreateWithPlatformFont to obtain a CGFont object from an ATS font. When you are ready to draw the text, you use the function CGContextShowGlyphsAtPoint rather than CGContextShowTextAtPoint.

人家说了，如果编码超出MacRoman的范围，你要使用CGContextShowGlyphsAtPoint来绘制。这个函数和CGContextS howTextAtPoint类似，也是5个参数，而且只有第四个参数不同，是字形数组（可能描述的不准确）CGGlyph glyphs[]，这个东西如何得到呢？在CoreText frameork（support iOS3.2 and later）提供了这样的接口。

Thank: 1: http://blog.csdn.net/kmyhy/article/details/7651794 2: http://blog.csdn.net/kmyhy/article/details/7643568 3: http://www.cnblogs.com/itentic/archive/2012/06/17/2552311.html