NSString 中某个字符出现的次数 [英] Number of Occurrences of a Character in NSString

问题描述

我有一个 NSString 或 NSMutableString 并且想要获取特定字符的出现次数.

I have an NSString or NSMutableString and would like to get the number of occurrences of a particular character.

我需要为相当多的字符执行此操作 - 在这种情况下为大写英文字符 - 所以它会很快.

I need to do this for quite a few characters -- uppercase English characters in this case -- so it would be nice for it to be quick.

推荐答案

replaceOccurrencesOfString:withString:options:range: 将返回数字NSMutableString 中替换的字符数.

[string replaceOccurrencesOfString:@"A" 
                        withString:@"B" 
                           options:NSLiteralSearch 
                             range:NSMakeRange(0, [receiver length])];

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