NSString字符位置 [英] NSString character position

问题描述

NSString *url = @"http://stackoverflow.com/questions/ask";

如何获得第4个/的字符位置？

How can I get the character position of the 4th "/" ?

推荐答案

如果您只是想获取网址的最后一部分，您应该能够使用它：

If you're just trying to get the last part of the url, you should be able to use this:

NSArray* items = [url componentsSeparatedByString:@"/"];

获取最后一个'/'字符的索引：

To get the index of the last '/' character:

NSRange range = [url rangeOfString:@"/" options:NSBackwardsSearch];

从获取索引值range.location

要从网址中找到第四个'/'字符的索引：

To find the index of the fourth '/' character from the url:

int count = 0;
int index = -1;
for (unsigned int i=0; i < [url length]; ++i) {
    if ([url characterAtIndex:i] == '/') {
        ++count;
        if (count == 4) {
            index = i;
            break;
        }
    }
}

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