Question

I have written a method (shown below). The project is compiled using ARC, but the file the method is in has to be compiled with the -fno-objc-arc switch because of a third party library dependency.

The leak inspector is telling me that there is a leak on

return [fragments componentsJoinedByString:@" "];

I can’t see it – could I ask for another pair of eyes to point out the error of my ways?

Many thanks

-(NSString *)trimAndTidy:(NSString *)aString
{
    NSCharacterSet *nsc = [NSCharacterSet characterSetWithCharactersInString:@"\r\n \t"];
    NSString *fragment;
    NSMutableArray *fragments = [NSMutableArray array];
    NSScanner *scanner = [NSScanner scannerWithString:aString];
    do
    {
        if ([scanner scanUpToCharactersFromSet:nsc intoString:&fragment])
            [fragments addObject:fragment];
    }
    while (![scanner isAtEnd]);
    return [fragments componentsJoinedByString:@" "];
}

Answer 1

The leak inspector tells you where a leak was allocated and not where the leak was caused.

To find the cause, you have to find the extra retain or missing release call.