问题描述
NSString 的 localizedCaseInsensitiveCompare：和 localizedStandardCompare： code>方法？
What is the difference between NSString's localizedCaseInsensitiveCompare: and localizedStandardCompare: methods?
我阅读了参考文献，但没有正确了解要使用哪一个。
I read the reference but did not get a proper idea of which one to use.
推荐答案
localizedCaseInsensitiveCompare：等效于：
[aString compare:otherString
options:NSCaseInsensitiveSearch
range:NSMakeRange(0,aString.length)
locale:[NSLocale currentLocale]];
localizedStandardCompare：基本上等同于： / p>
localizedStandardCompare: is basically equivalent to:
[aString compare:otherString
options:NSCaseInsensitiveSearch | NSNumericSearch
range:NSMakeRange(0,aString.length)
locale:[NSLocale currentLocale]];
因此，主要区别是字符串中的数字如何比较。
So, the primary difference is in how numbers within strings are compared.
使用 localizedCaseInsensitiveCompare：比较以下3个字符串将导致以下顺序：
Comparing the following 3 strings using localizedCaseInsensitiveCompare: would result in the following order:
"Foo2.txt",
"Foo25.txt",
"Foo7.txt"
另一方面，使用 localizedStandardCompare：比较它们会产生以下顺序：
On the other hand, comparing them using localizedStandardCompare: would result in the following order:
"Foo2.txt",
"Foo7.txt",
"Foo25.txt"
当 localizedCaseInsensitiveCompare：方法一直存在时， localizedStandardCompare：最近才添加（OS X 10.6）。 Finder使用数字方法排序文件名，在添加 localizedStandardCompare：之前，开发人员没有一种简单的方法来确保他们可以像Finder那样排序字符串。
While the localizedCaseInsensitiveCompare: method has been around forever, the localizedStandardCompare: was only added recently (OS X 10.6). The Finder sorts filenames using the numeric method, and prior to the addition of localizedStandardCompare:, developers were without an easy way to assure they could sort strings like the Finder did.
当确定要使用哪个字符串时，如果要比较的字符串表示文件名，那么您应该肯定会使用 localizedStandardCompare：。
When determining which one to use, if the strings you're comparing represent filenames, then you should definitely tend toward using localizedStandardCompare:.
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