NSString中字符的出现次数 [英] Number of Occurrences of a Character in NSString

问题描述

我有一个 NSString 或 NSMutableString ，并希望得到一个特定字符的出现次数。 / p>

我需要这样做相当多的字符 - 在这种情况下大写英文字符，所以它是很好的快速。

解决方案

replaceOccurrencesOfString：withString：options：range： 将返回 NSMutableString 中替换的字符数。

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

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

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.

解决方案

replaceOccurrencesOfString:withString:options:range: will return the number of characters replaced in a NSMutableString.

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

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