遍历NSString中所有字符的最有效方法 [英] Most efficient way to iterate over all the chars in an NSString

问题描述

迭代NSString中所有字符的最佳方法是什么?您是否想遍历字符串的长度并使用该方法.

What's the best way to iterate over all the chars in an NSString? Would you want to loop over the length of the string and use the method.

[aNSString characterAtIndex:index];

还是您要使用基于NSString的char缓冲区?

or would you want to user a char buffer based on the NSString?

推荐答案

我肯定会先获得一个char缓冲区，然后对其进行迭代.

I would definitely get a char buffer first, then iterate over that.

NSString *someString = ...

unsigned int len = [someString length];
char buffer[len];

//This way:
strncpy(buffer, [someString UTF8String]);

//Or this way (preferred):

[someString getCharacters:buffer range:NSMakeRange(0, len)];

for(int i = 0; i < len; ++i) {
   char current = buffer[i];
   //do something with current...
}

这篇关于遍历NSString中所有字符的最有效方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！