Issue with replacing special characters

Question

Im having a issue with removing special characters from the string .I used the following code.But dint work.Please suggest me better logic

- (NSString *)trimmedReciString:(NSString *)stringName 
{
    NSCharacterSet *myCharSet = [NSCharacterSet characterSetWithCharactersInString:@"-/:;()$&@\".,?!\'[]{}#%^*+=_|~<>€£¥•."];
    for (int i = 0; i < [stringName length]; i++) {
        unichar c = [stringName characterAtIndex:i];
        if ([myCharSet characterIsMember:c]) {
            NSLog(@"%@",[NSString stringWithFormat:@"%c",[stringName characterAtIndex:i]]);
            stringName =  [stringName stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%c",[stringName characterAtIndex:i]] withString:@""];  

        }
    }
    return stringName;
}

Answer 1

NSString *s = @"$$$hgh$g%k&fg$$tw/-tg";
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"-/:;()$&@\".,?!\'[]{}#%^*+=_|~<>€£¥•."];
s = [[s componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""];
NSLog(@"String is: %@", s);