iOS Foundation 框架中 Mutable 的类们

iOS Foundation 框架中 Mutable 的类们

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Mutable 对于那些不能直接对其中内容进行更改的类来说，是一种扩展方式，象数值这类的，不涉及到指针的，就没有 Mutable 子类，可能是因为其本身可以直接修改自身值吧。

换句话说，象字符串这类内容与地址不同且都可以被更改的存储，在高级语言中，更关心的是内容的更改，尤其象 Java 已经用“引用”淡化了指针的概念，而实际内部是在操作指针这类东西，我也是估计的。

Title	Resource Type	Topic	Framework	Date
NSMutableArray Class Reference	Reference	Data Management Data Types & Collections	Foundation	2013-10-22 Minor Change
NSMutableAttributedString Class Reference	Reference	Data Management Strings, Text, & Fonts	Foundation	2010-02-25 Content Update
NSMutableAttributedString UIKit Additions Reference	Reference	Data Management Strings, Text, & Fonts	UIKit	2013-09-18 First Version
NSMutableCharacterSet Class Reference	Reference	Data Management Strings, Text, & Fonts	Foundation	2006-05-23 Minor Change
NSMutableCopying Protocol Reference	Reference		Foundation	2006-05-23 Minor Change
NSMutableData Class Reference	Reference	Data Management Data Types & Collections	Foundation	2007-03-26 Minor Change
NSMutableDictionary Class Reference	Reference	Data Management Data Types & Collections	Foundation	2013-10-22 Minor Change
NSMutableIndexSet Class Reference	Reference	Data Management Data Types & Collections	Foundation	2014-02-11 Minor Change
NSMutableOrderedSet Class Reference	Reference	Data Management Data Types & Collections	Foundation	2013-10-22 Minor Change
NSMutableParagraphStyle Class Reference	Reference	Data Management Strings, Text, & Fonts	UIKit	2013-09-18 Minor Change
NSMutableSet Class Reference	Reference	Data Management Data Types & Collections	Foundation	2013-10-22 Minor Change
NSMutableString Class Reference	Reference	Data Management Strings, Text, & Fonts	Foundation	2007-03-06 Minor Change
NSMutableURLRequest Class Reference	Reference	Networking & Internet Protocol Streams	Foundation	2014-02-11 Minor Change

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