NSCaseInsensitiveSearch在rangeOfCharacterFromSet中不起作用 [英] NSCaseInsensitiveSearch not works in rangeOfCharacterFromSet
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问题描述
似乎 NSCaseInsensitiveSearch 在 NSString：rangeOfCharacterFromSet 中不起作用。有人可以解释为什么吗？是正确的行为吗？
It seems that NSCaseInsensitiveSearch not works in NSString:rangeOfCharacterFromSet. Can someone explain why? is it correct behaviour?
NSString *string = @"James Bond Always Rocks";
NSRange range = [string rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@"J"] options:NSCaseInsensitiveSearch];
NSLog(@"range->%@",NSStringFromRange(range)); //This prints range->{0, 1}
NSString *string = @"James Bond Always Rocks";
NSRange range = [string rangeOfCharacterFromSet:[NSCharacterSet characterSetWithCharactersInString:@"j"] options:NSCaseInsensitiveSearch];
NSLog(@"range->%@",NSStringFromRange(range)); //This prints range->{2147483647, 0}
推荐答案
从文档中：选项：指定搜索选项的掩码。可以通过将它们与C位或运算符组合来指定以下选项：NSAnchoredSearch，NSBackwardsSearch。所以它似乎是一个正确的行为，不知道为什么只有这两个选项可以应用。
From the documentation: "Options: A mask specifying search options. The following options may be specified by combining them with the C bitwise OR operator: NSAnchoredSearch, NSBackwardsSearch." So it seems like a correct behavior, not sure why only those two options can apply.
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