title: iOS: file name in email attachment
body: <p>I can send a .csv file as an attachment from my app, but I'd like to shorten the name file for that attachment, because there will be a pile of csv files delivered to the recipient.</p>
  
  <p>Piece of code:</p>
  
  <pre><code>...      
  if (dorsalesPorTramoYcontrol &amp;&amp; dorsalesPorTramoYcontrol.count )
                  {
                      NSMutableString *mainString = [[ NSMutableString alloc]initWithString:@"dorsal,paso,tiempo\n"];
  
                      for (NSManagedObject *get in dorsalesPorTramoYcontrol) {
  
                           //dorsales
                          NSString *string =[get valueForKey:@"dorsal"];
                          [mainString appendFormat:@"%@,",string];
  
                          //paso
                          string = [get valueForKey:@"paso"];
                          string=[string stringByReplacingOccurrencesOfString:@"\"" withString:@"\"\""];
                          [mainString appendFormat:@"%@,",string];
  
                          //tiempo
                          string = [get valueForKey:@"tiempo"];
                          string=[string stringByReplacingOccurrencesOfString:@"\"" withString:@"\"\""];
                          [mainString appendFormat:@"%@",string];
  
                                  [mainString appendFormat:@"\n"];
                          }
  
                      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                      NSString *documentsDirectoryPath = [paths objectAtIndex:0];
  
  file = [NSString stringWithFormat:@"%@/Tramo%@Control%@.csv", documentsDirectoryPath,section,control];
  
                      NSError *csVerror= NULL;
                      BOOL written = [mainString writeToFile:file atomically:YES encoding:NSUTF8StringEncoding error:&amp;csVerror];
                      if (!written)  {
                          NSLog( @"Writing failed, error = %@",csVerror);
                      }else {
                          NSLog(@"Data saved! File path = %@",file);
                          [self composeEmail];
                      }
                  }
      }
  
      -(void)composeEmail{
  
          if ([MFMailComposeViewController canSendMail])
          {
  
              MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
              mailer.mailComposeDelegate = self;
              [mailer setSubject:[NSString   stringWithFormat:@"Resultados Tramo: %@ - Control: %@", section, control]];
              NSArray *toRecipients = [NSArray arrayWithObjects:@"somebodymail@mail.com", nil];
              [mailer setToRecipients:toRecipients];
  
              // Logo
              UIImage *myImage = [UIImage imageNamed:@"logo.png"];
              NSData *imageData = UIImagePNGRepresentation(myImage);
              [mailer addAttachmentData:imageData mimeType:@"image/png" fileName:@"Icon"];
  
  
              [mailer addAttachmentData:[NSData dataWithContentsOfFile:file] mimeType:@"text/csv" fileName:file];
              NSString *emailBody =
              [NSString   stringWithFormat:@"Resultados Tramo: %@ - Control: %@ \nDorsal - Paso - Tiempo", section, control];
              [mailer setMessageBody:emailBody isHTML:NO];
              mailer.modalPresentationStyle = UIModalPresentationPageSheet;
              [self presentViewController:mailer animated:YES completion:nil];
          }
          else
          {
              UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
                                                              message:@"Your device doesn't support the composer sheet"
                                                             delegate:nil
                                                    cancelButtonTitle:@"OK"
                                                    otherButtonTitles: nil];
              [alert show];
          }
      }
  </code></pre>
  
  <p>The filename is the following:</p>
  
  <pre><code>&lt;_var_mobile_Applications_BE8CE610-A83E-4C79-8B9C-0263FA6881D6_Documents_Tramo2Control4.csv&gt;
  </code></pre>
  
  <p>and I'd like it to be just <strong>"Tramo2Control4.csv"</strong> </p>
  
  <p>Could you please offer some suggestions to get it?</p>