如何从另一个字符串替换 NSMutableString 中出现的字符串

发布于 2024-09-19 09:13:24 字数 482 浏览 6 评论 0原文

我有一个 NSMutableString 包含一个单词两次。（例如 /abc ............ /abc）。

现在我想用 /xyz 替换这两次出现的 /abc。我只想替换第一个和最后一个出现的情况，而不替换其他出现的情况。

 - (NSUInteger)replaceOccurrencesOfString:(NSString *)target
                               withString:(NSString *)replacement
                                  options:(NSStringCompareOptions)opts 
                                    range:(NSRange)searchRange

我找到了 NSMutableString 的实例方法，但我无法在我的情况下使用它。大家有什么解决办法吗？？

原文

I have a NSMutableString that contains a word twice.(e.g. /abc ...................... /abc).

Now I want to replace these two occurrences of /abc with /xyz. I want to replace only first and last occurence no other occurences.

 - (NSUInteger)replaceOccurrencesOfString:(NSString *)target
                               withString:(NSString *)replacement
                                  options:(NSStringCompareOptions)opts 
                                    range:(NSRange)searchRange

I find this instance method of NSMutableString but I am not able to use it in my case.
Anyone have any solution??

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尐偏执 2024-09-26 09:13:25

可以先找到这两个范围，然后分别替换：

NSMutableString *s = [NSMutableString stringWithString:@"/abc asdfpjklwe /abc"];

NSRange a = [s rangeOfString:@"/abc"];
NSRange b = [s rangeOfString:@"/abc" options:NSBackwardsSearch];

if ((a.location == NSNotFound) || (b.location == NSNotFound))  {
    // at least one of the substrings not present
} else {
    [s replaceCharactersInRange:a withString:@"/xyz"];
    [s replaceCharactersInRange:b withString:@"/xyz"];
}

You can first find the two ranges and then replace them seperately:

NSMutableString *s = [NSMutableString stringWithString:@"/abc asdfpjklwe /abc"];

NSRange a = [s rangeOfString:@"/abc"];
NSRange b = [s rangeOfString:@"/abc" options:NSBackwardsSearch];

if ((a.location == NSNotFound) || (b.location == NSNotFound))  {
    // at least one of the substrings not present
} else {
    [s replaceCharactersInRange:a withString:@"/xyz"];
    [s replaceCharactersInRange:b withString:@"/xyz"];
}

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