NSAttributedString：
http://blog.csdn.net/kmyhy/article/details/8895638
CTFramesetterSuggestFrameSizeWithConstraints：
http://blog.sina.com.cn/s/blog_6308b98c0101byh9.html
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NSAttributedString： http://blog.csdn.net/kmyhy/article/details/8895638
CTFramesetterSuggestFrameSizeWithConstraints： http://blog.sina.com.cn/s/blog_6308b98c0101byh9.html 
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