iOS平台下生成pdf的一个demo，适合新手学习用-generate a pdf of the demo iOS platform, suitable for novices to learn

PDF生成类（将文本，html网页生成pdf的类），精选ios编程学习源码，很好的参考资料。-PDF generates a class (class HTML Webpage generation PDF will text, select), learning IOS programming source code, a good reference.