如何计算 NSString 中大写字符的数量?

How to count the number of uppercase characters in a NSString?(如何计算 NSString 中大写字符的数量?)

问题描述

我正在尝试找出计算 NSString 中大写字符数的最佳方法.我知道如何使用以下代码找出某个字符是否为大写:

I'm trying to find out the best way to count the number of uppercase characters that are in a NSString. I know how to find out if a certain character is uppercase by using this code:

NSString *s = @"This is a string";
BOOL isUppercase = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[s characterAtIndex:0]];

计算 NSString 中大写字母数量的最佳方法是什么?谢谢.

What would be the best way to count the number of uppercase letters in a NSString? Thanks.

推荐答案

NSString *s = @"This is a string";  
int count=0;  
for (i = 0; i < [s length]; i++) {
    BOOL isUppercase = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[s characterAtIndex:i]];
    if (isUppercase == YES)
       count++;
}

count 是大写出现的次数.

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