与一堆字符串比较不区分大小写 [英] Case insensitive compare against bunch of strings

问题描述

将 NSString 与其他不区分大小写的字符串进行比较的最佳方法是什么?如果它是字符串之一，则该方法应返回 YES，否则返回 NO.

What would be the best method to compare an NSString to a bunch of other strings case insensitive? If it is one of the strings then the method should return YES, otherwise NO.

推荐答案

这里有个小辅助函数:

BOOL isContainedIn(NSArray* bunchOfStrings, NSString* stringToCheck)
{
    for (NSString* string in bunchOfStrings) {
        if ([string caseInsensitiveCompare:stringToCheck] == NSOrderedSame)
            return YES;
    }
    return NO;
}

当然，这可以针对不同的用例进行极大优化.

Of course this could be greatly optimized for different use cases.

例如，如果您对常量 bundleOfStrings 进行大量检查，您可以使用 NSSet 来保存字符串的小写版本并使用 containsObject::

If, for example, you make a lot of checks against a constant bunchOfStrings you could use an NSSet to hold lower case versions of the strings and use containsObject::

BOOL isContainedIn(NSSet* bunchOfLowercaseStrings, NSString* stringToCheck)
{
    return [bunchOfLowercaseStrings containsObject:[stringToCheck lowercaseString]];
}

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