caseInsensitiveCompare

BOOL result1 = [err caseInsensitiveCompare:@"7B"]==NSOrderedSame;// 不区分大小写比较

Returns the result of invoking compare:options: with NSCaseInsensitiveSearch as the only option.

This method is the equivalent of invoking compare:options:with NSCaseInsensitiveSearchas the only option.

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原文地址：https://www.cnblogs.com/dengchaojie/p/7794344.html