localizedCaseInsensitiveCompare似乎不适用于swedish字符 [英] localizedCaseInsensitiveCompare does not seem to work with swedish characters

问题描述

我想按字母顺序排序数组。在瑞典字母表中，字母Å是字母表中第三个最后一个字母，所以下面的数组应该排序为 A，B，Å，而是排序为 A，Å，B 。这个行为的原因是什么？

I'm trying to sort an array alphabetically. In the swedish alphabet the letter Å is third last letter in the alphabet so the below array should be sorted like A, B, Å but instead it is sorted like A, Å, B. What could be the reason for this behaviour?

NSArray *test = @[@"Å", @"A", @"B"];

NSArray *sortedTest = [test sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)]; 
// Output is A, Å, B

推荐答案

p>也许当前的语言环境不是瑞典语语言环境？

Perhaps the current locale is not the Swedish locale?

如果您明确使用瑞典语语言环境对字符串进行排序，它会正常工作：

It works as expected if you explicitly use a Swedish locale for sorting the strings:

NSArray *test = @[@"Å", @"A", @"B"];
NSLocale *swedish = [[NSLocale alloc] initWithLocaleIdentifier:@"sv"];

NSArray *sortedTest = [test sortedArrayWithOptions:0
                                   usingComparator:^(NSString  *v1, NSString *v2) {
    return [v1 compare:v2 options:NSCaseInsensitiveSearch
                 range:NSMakeRange(0, [v1 length])
                locale:swedish];
}];

// Output: A, B, Å

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