Issue with replacing special characters

问题

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;
}

回答1:

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

回答2:

Try this...

NSString *unfilteredString = @"!@#$%^&*()_+|abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
NSCharacterSet *notAllowedChars = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"] invertedSet];
NSString *resultString = [[unfilteredString componentsSeparatedByCharactersInSet:notAllowedChars] componentsJoinedByString:@""];
NSLog (@"Result: %@", resultString);

回答3:

Try starting from the end of the string and work backwards instead of going from front to back, since you're likely to accidentally (and unintentionally) skip characters when the previous character gets deleted.

来源：https://stackoverflow.com/questions/13487931/issue-with-replacing-special-characters