中文输入法，输入验证码，字母之间出现空格的解决办法

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString* newstring = [textField.text stringByReplacingCharactersInRange:range withString:string];
    NSString *checker = [NSString stringWithFormat:@"%C", 8198]; // %C为大写
    if ([newstring rangeOfString:checker].length) {
        newstring = [newstring stringByReplacingOccurrencesOfString:checker withString:@""];
    }
}