iphone - 以编程方式通过电子邮件发送 iPhone 附件

Question

我正在编写一个 iPhone 应用程序，它要求我以编程方式发送电子邮件附件。附件是我通过代码创建的 csv 文件。然后，我将文件附加到电子邮件中，附件就会显示在手机上。但是，当我向自己发送电子邮件时，附件不会出现在电子邮件中。这是我正在使用的代码。

    [self exportData];

if ([MFMailComposeViewController canSendMail])
{
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"expenses" ofType:@"csv"];  
    NSData *myData = [NSData dataWithContentsOfFile:filePath]; 

    MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];

    mailer.mailComposeDelegate = self;

    [mailer setSubject:@"Vehicle Expenses from myConsultant"];

    NSString *emailBody = @"";
    [mailer setMessageBody:emailBody isHTML:NO];

    [mailer addAttachmentData:myData mimeType:@"text/plain" fileName:@"expenses"];

    [self presentModalViewController:mailer animated:YES];

    [mailer release]; 
}
else
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
                                                    message:@"Your device doesn't support the composer sheet"
                                                   delegate:nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];
    [alert release];
}
}
- (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 dismissModalViewControllerAnimated:YES];

正在成功创建 - 我 checkin 了模拟器文件。

- (void) exportData
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES); 
    NSString *documentsDir = [paths objectAtIndex:0];
    NSString *root = [documentsDir stringByAppendingPathComponent:@"expenses.csv"];
    NSString *temp=@"Date,Purpose,Start Odometer,End Odometer, Total Driven, Fees, ";
    for(int i = 0; i < expenses.count; i++){
        VehicleExpense *tempExpense = [expenses objectAtIndex:i];
        temp = [temp stringByAppendingString:tempExpense.date];
        temp = [temp stringByAppendingString:@", "];
        temp = [temp stringByAppendingString:tempExpense.purpose];
        temp = [temp stringByAppendingString:@", "];
        temp = [temp stringByAppendingString:[NSString stringWithFormat: @"%.02f",tempExpense.start_mile]];
        temp = [temp stringByAppendingString:@", "];
        temp = [temp stringByAppendingString:[NSString stringWithFormat: @"%.02f",tempExpense.end_mile]];
        temp = [temp stringByAppendingString:@", "];
        temp = [temp stringByAppendingString:[NSString stringWithFormat: @"%.02f",tempExpense.distance]];
        temp = [temp stringByAppendingString:@", "];
        temp = [temp stringByAppendingString:[NSString stringWithFormat: @"%.02f",tempExpense.fees]];
        temp = [temp stringByAppendingString:@", "];
    }
    [temp writeToFile:root atomically:YES encoding:NSUTF8StringEncoding error:NULL];
    NSLog(@"got here in export data--- %@", documentsDir);

}

Answer 1

尝试一下[mailer addAttachmentData:myData mimeType:@"text/csv"fileName:@"expenses.csv"];

编辑:这是我在我的应用程序中使用的代码:

- (IBAction) ExportData:(id)sender
{       
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:kExportFileName];

    self.timeRecords = [[NSMutableArray alloc] init];
    for (int i=0; i< [self.selectedTimeEntries count]; i++) 
        for (int j=0; j<[[self.selectedTimeEntries objectAtIndex:i] count]; j++) 
            if ([[self.selectedTimeEntries objectAtIndex:i] objectAtIndex:j] == [NSNumber numberWithBool:YES]) 
                [self.timeRecords addObject:[self timeEntriesForDay:[self.uniqueArray objectAtIndex:i] forIndex:j]];

    if( !([self.timeRecords count]!=0))
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"There are no time entries selected!" message:@"Please select at least one time entry before proceeding" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];        
        return;
    }
    NSMutableString *csvLine;
    NSError *err = nil;
    NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSString *dateString = nil;
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setPositiveFormat:@"###0.##"];
    NSString *formattedNumberString = nil;

    if(![[NSFileManager defaultManager] fileExistsAtPath:filePath])        
    {
        [[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
    }

    for (timeEntries *timeEntry in self.timeRecords) {
        csvLine = [NSMutableString stringWithString:timeEntry.client];
        [csvLine appendString:@","];
        [csvLine appendString:timeEntry.category];
        [csvLine appendString:@","];
        [csvLine appendString:timeEntry.task];
        [csvLine appendString:@","];
        dateString = [dateFormatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:timeEntry.date]];
        [csvLine appendString:dateString];
        [csvLine appendString:@","];
        formattedNumberString = [numberFormatter stringFromNumber:timeEntry.duration];
        [csvLine appendString:formattedNumberString];
        [csvLine appendString:@","];
        [csvLine appendString:timeEntry.description];
        [csvLine appendString:@"\n"];

        if([[NSFileManager defaultManager] fileExistsAtPath:filePath])        
        {     
            NSString *oldFile = [[NSString alloc] initWithContentsOfFile:filePath];
            [csvLine insertString:oldFile atIndex:0];
            BOOL success =[csvLine writeToFile:filePath atomically:NO encoding:NSUTF8StringEncoding error:&err];
            if(success){

            }
            [oldFile release];
        }
    } 
    if (!appDelegate.shouldSendCSV) {
    self.csvText = csvLine;
    }
    if([[NSFileManager defaultManager] fileExistsAtPath:filePath])        
    {
        [self emailExport:filePath];
    }   
    self.selectedTimeEntries =nil;
    self.navigationController.toolbarHidden = NO;
}


- (void)emailExport:(NSString *)filePath
{
    NSLog(@"Should send CSV = %@", [NSNumber numberWithBool:appDelegate.shouldSendCSV]);
    MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
    picker.mailComposeDelegate = self;

    // Set the subject of email
    [picker setSubject:@"My Billed Time Export"];

    // Add email addresses
    // Notice three sections: "to" "cc" and "bcc"   

    NSString *valueForEmail = [[NSUserDefaults standardUserDefaults] stringForKey:@"emailEntry"];
    NSString *valueForCCEmail = [[NSUserDefaults standardUserDefaults] stringForKey:@"ccEmailEntry"];
    if( valueForEmail == nil ||  [valueForEmail isEqualToString:@""])
    {
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Please set an email address before sending a time entry!" message:@"You can change this address later from the settings menu of the application!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];        

        return;
    }
    else {
        [picker setToRecipients:[NSArray arrayWithObjects:valueForEmail, nil]];
    }

    if(valueForCCEmail != nil || ![valueForCCEmail isEqualToString:@""])
    {
        [picker setCcRecipients:[NSArray arrayWithObjects:valueForCCEmail, nil]];
    }

    // Fill out the email body text
    NSString *emailBody = @"My Billed Time Export File.";

    // This is not an HTML formatted email
    [picker setMessageBody:emailBody isHTML:NO];

    if (appDelegate.shouldSendCSV) {

    // Create NSData object from file
    NSData *exportFileData = [NSData dataWithContentsOfFile:filePath];

    // Attach image data to the email 
    [picker addAttachmentData:exportFileData mimeType:@"text/csv" fileName:@"MyFile.csv"];
    } else {
        [picker setMessageBody:self.csvText isHTML:NO];
    }
    // Show email view  
    [self presentModalViewController:picker animated:YES];

    // Release picker
    [picker release];
}