我正在尝试发送文件，但是当我打开收到的电子邮件时，附件消失了，嗯，只有一个，因为图像在那里。文件格式为文本/纯文本，扩展名为 .csv。在模拟器上工作，我可以毫无问题地打开和读取文件。在 iPhone (iOS 7) 或 iPad (iOS 6.1) 上安装该应用程序后，该文件将附加到电子邮件中，但是，正如我之前所说，该文件在到达收件人之前就消失了。iPhone 屏幕截图：
当我在电脑上打开电子邮件时：
我用来编写和加载文件的代码：
- (IBAction)buttonSendData:(id)sender {
if ([self checkUIPicker])
{
//fetching data
COAppDelegate *appDelegate = (COAppDelegate *) [[UIApplication sharedApplication]delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSError *error;
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Tiempos" inManagedObjectContext:context];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc ]init];
[fetchRequest setEntity:entity];
NSPredicate *sectionAndControl = [NSPredicate predicateWithFormat:@"(tramo == %@) AND (control == %@)", section, control];
[fetchRequest setPredicate:sectionAndControl];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]initWithKey:@"dorsal" ascending:YES];
[fetchRequest setSortDescriptors:@[sortDescriptor ]];
dorsalesPorTramoYcontrol = [context executeFetchRequest:fetchRequest error:&error];
if (!dorsalesPorTramoYcontrol || !dorsalesPorTramoYcontrol.count) {
UIAlertView *alertFail = [[UIAlertView alloc]initWithTitle:@"Atención" message:@"No hay registros que cumplan esos criterios" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alertFail show];
}
}
if (dorsalesPorTramoYcontrol && 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];
//new line
[mainString appendFormat:@"\n"];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
file = [documentsDirectoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"/Tramo#%@_Control#%@.csv",section,control]];
NSData *settingsData;
settingsData = [mainString dataUsingEncoding:NSASCIIStringEncoding];
if ([settingsData writeToFile:file atomically:YES]) {
NSLog(@"writing Ok");
[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:@"turkish@mundo-r.com", nil];
[mailer setToRecipients:toRecipients];
//Clasicos Ourense Logo
UIImage *myImage = [UIImage imageNamed:@"clasicosOurense.png"];
NSData *imageData = UIImagePNGRepresentation(myImage);
[mailer addAttachmentData:imageData mimeType:@"image/png" fileName:@"Icon"];
//file attachment
// Determine the file name and extension
NSArray *filepart = [file componentsSeparatedByString:@"."];
NSString *filename = [filepart objectAtIndex:0];
NSString *extension = [filepart objectAtIndex:1];
// Get the resource path and read the file using NSData
NSString *filePath = [[NSBundle mainBundle] pathForResource:filename ofType:extension];
NSData *fileData = [NSData dataWithContentsOfFile:filePath];
// Add attachment
[mailer addAttachmentData:fileData mimeType:@"text/plain" fileName:filename];
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];
}
}
-(BOOL) checkUIPicker{
if ((control.length == 0) || (section.length == 0))
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Atención" message:@"Escoge un tramo y un control horario" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
return NO;
}else if ((!control.length==0) && (!section.length==0 )) {
UIAlertView *alertSend = [[UIAlertView alloc]initWithTitle:@"Atención" message:[NSString stringWithFormat:@"Vas a enviar la información correspondiente al control: %@ del tramo: %@", control, section] delegate:self cancelButtonTitle:@"Correcto" otherButtonTitles: nil];
[alertSend show];
return YES;
}
return NO;
}
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
switch (result)
{
case MFMailComposeResultCancelled:
NSLog(@"Mail cancelled: you cancelled the operation and no email message was queued.");
break;
case MFMailComposeResultSaved:
NSLog(@"Mail saved: you saved the email message in the drafts folder.");
break;
case MFMailComposeResultSent:
NSLog(@"Mail send: the email message is queued in the outbox. It is ready to send.");
break;
case MFMailComposeResultFailed:
NSLog(@"Mail failed: the email message was not saved or queued, possibly due to an error.");
break;
default:
NSLog(@"Mail not sent.");
break;
}
// Remove the mail view
[self dismissViewControllerAnimated:YES completion:nil];
}
失败在哪里？谢谢！