CODEWITHSUNDEEP
objective-cxcodemacosxcode9
qalt
qalt

Reputation: 39

Find String between two Strings and replace a part of it

I have some problems and need some help with Objective-C. I'm trying to find a String, let's say it is called <font> in a XML File and within the Tag I want to replace a word in a sentence.

Something like this

<body>
...
<font>Let's do a quick test</font>
...
</body>

For example: Between <font> and </font> I want to replace the word quick to good. And those changes has to overwrite the XML-File.

If someone can help me please let me know.

Thank you

Upvotes: 0

Views: 432

Answers (1)

iamVishal16
iamVishal16

Reputation: 1780

  • Firstly get the string between two string using this method

    NSString *str1 = [self getSubString:fullString fromRangeOfString:@"<font>" endWith:@"</font>"];

-

-(NSString *)getSubString:(NSString *)string fromRangeOfString:(NSString *)rangeStr endWith:(NSString *)endStr{
    NSString *param = @"";
    NSRange start = [string rangeOfString:rangeStr];
    if (start.location != NSNotFound)
    {
        param = [string substringFromIndex:start.location + start.length];
        NSRange end = [param rangeOfString:endStr];
        if (end.location != NSNotFound)
        {
            param = [param substringToIndex:end.location];
        }
    }
    return param;
}

  • Now str1 contains @"Let's do a quick test" then replace the word quick to good

    NSString *str2 = [str1 stringByReplacingOccurrencesOfString:@"quick" withString:@"good"];

  • There are some more methods provided by Apple which help you to replace with more options

/* Replace all occurrences of the target string in the specified range with replacement. Specified compare options are used for matching target. If NSRegularExpressionSearch is specified, the replacement is treated as a template, as in the corresponding NSRegularExpression methods, and no other options can apply except NSCaseInsensitiveSearch and NSAnchoredSearch. */

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement options:(NSStringCompareOptions)options range:(NSRange)searchRange NS_AVAILABLE(10_5, 2_0);

/* Replace all occurrences of the target string with replacement. Invokes the above method with 0 options and range of the whole string. */

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement NS_AVAILABLE(10_5, 2_0);

/* Replace characters in range with the specified string, returning new string. */

- (NSString *)stringByReplacingCharactersInRange:(NSRange)range withString:(NSString *)replacement NS_AVAILABLE(10_5, 2_0);
  • Write resulting str2 to XML

................................<><><><><><><>...........................

XMLWriter *xmlWriter = [[XMLWriter alloc] init];
// start writing XML elements
[xmlWriter writeStartElement:@"font"];
[xmlWriter writeCharacters:str2];
[xmlWriter writeEndElement];

Thanks, Hope this helps you.

Upvotes: 1

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