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		<title>[转]深入理解Objective-C：Category</title>
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				<category><![CDATA[iOS]]></category>
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					<description><![CDATA[转载自：http://www.cocoachina.com/bbs/read.php?tid=83441 摘要 无论一个类设计的多么完美，在未来的需求演进中，都有可能会碰到一些无法预测的情况。那怎么扩展已有的类呢？一般而言，继承和组合是不错的选择。但是在Objective-C 2.0中，又提供了category这个语言特性，可以动态地为已有类添加新行为。如今category已经遍布于Objective-C代码的各个角落，从Apple官方的framework到各个开源框架，从功能繁复的[......] 继续阅读]]></description>
		
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