CamelCase 下划线并返回到 Objective-C [英] CamelCase to underscores and back in Objective-C

问题描述

我正在寻找一种简单有效的方法将 CamelCase 中的字符串转换为下划线符号(即 MyClassName -> my_class_name)，然后在 Objective C 中再次返回.

I'm looking for a simple, efficient way to convert strings in CamelCase to underscore notation (i.e., MyClassName -> my_class_name) and back again in Objective C.

我当前的解决方案涉及 NSMutableStrings 上的大量 rangeOfString、characterAtIndex 和 replaceCharactersInRange 操作，而且非常丑陋:)似乎必须有更好的解决方案，但我不确定它是什么.

My current solution involves lots of rangeOfString, characterAtIndex, and replaceCharactersInRange operations on NSMutableStrings, and is just plain ugly as hell :) It seems that there must be a better solution, but I'm not sure what it is.

我宁愿不只为这个用例导入正则表达式库，但如果所有其他方法都失败了，这是一个选项.

I'd rather not import a regex library just for this one use case, though that is an option if all else fails.

推荐答案

Chris 对 RegexKitLite 的建议很好.这是一个出色的工具包，但可以通过 NSScanner.使用 -scanCharactersFromSet:intoString: 在 +uppercaseLetterCharacterSet 和 +lowercaseLetterCharacterSet 之间交替使用.返回时，您将使用 -scanUpToCharactersFromSet: 代替，使用其中只有一个下划线的字符集.

Chris's suggestion of RegexKitLite is good. It's an excellent toolkit, but this could be done pretty easily with NSScanner. Use -scanCharactersFromSet:intoString: alternating between +uppercaseLetterCharacterSet and +lowercaseLetterCharacterSet. For going back, you'd use -scanUpToCharactersFromSet: instead, using a character set with just an underscore in it.

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