如何计算 NSString 中大写字符的数量？

发布于 2024-11-30 14:07:22 字数 323 浏览 0 评论 0原文

我试图找到计算 NSString 中大写字符数量的最佳方法。我知道如何使用以下代码找出某个字符是否为大写：

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

What would be the best way to count the number of uppercase letter in a NSString?谢谢。

原文

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]];

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

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陈年往事 2024-12-07 14:07:22

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 是大写字母出现的次数。

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 is the number of uppercase occurences.

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铃予 2024-12-07 14:07:22

逐一遍历字符串中的索引，只要找到大写字母，就将 1 添加到计数器。

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故人如初 2024-12-07 14:07:22

一条线解决方案

 NSUInteger count = [[[@"A string HERE!!" componentsSeparatedByCharactersInSet:[[NSCharacterSet uppercaseLetterCharacterSet] invertedSet]] componentsJoinedByString:@""] length]; // count = 5

One line solution

 NSUInteger count = [[[@"A string HERE!!" componentsSeparatedByCharactersInSet:[[NSCharacterSet uppercaseLetterCharacterSet] invertedSet]] componentsJoinedByString:@""] length]; // count = 5

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