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POMFMailComposeViewController: Attaching Images from Photo Gallery
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copied!<p>I am having a bit of trouble attaching images from the Photo Gallery to an email. </p> <p>Basically, one of the features of my application allow the user to take photos. When they snap the shot, I record the URL Reference to the image in Core Data. I understand that you have to go through the <code>ALAssetRepresentation</code> to get to the image. I have this up and running within my application for when the user wants to review an image that they have taken.</p> <p>I am now attempting to allow the user to attach all of the photos taken for an event to an email. While doing this, I iterate through the Core Data entity that stores the URL References, call a method that returns a <code>UIImage</code> from the <code>ALAssetsLibrary</code> and then attaches it using the <code>NSData</code>/<code>UIImageJPEGRepresentation</code> and <code>MFMailComposeViewController</code>/<code>addAttachmentData</code> methods.</p> <p>Problem is: When the email is presented to the user, there are small blue squares representing the images and the image is not attached.</p> <p>Here is the code:</p> <pre><code>- (void)sendReportReport { if ([MFMailComposeViewController canSendMail]) { MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init]; mailer.mailComposeDelegate = self; [mailer setSubject:@"Log: Report"]; NSArray *toRecipients = [NSArray arrayWithObjects:@"someone@someco.com", nil]; [mailer setToRecipients:toRecipients]; NSError *error; NSFetchRequest *fetchPhotos = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Photo" inManagedObjectContext:__managedObjectContext]; [fetchPhotos setEntity:entity]; NSArray *fetchedPhotos = [__managedObjectContext executeFetchRequest:fetchPhotos error:&error]; int counter; for (NSManagedObject *managedObject in fetchedPhotos ) { Photo *photo = (Photo *)managedObject; // UIImage *myImage = [UIImage imageNamed:[NSString stringWithFormat:@"%@.png", counter++]]; NSData *imageData = UIImageJPEGRepresentation([self getImage:photo.referenceURL], 0.5); // NSData *imageData = UIImagePNGRepresentation([self getImage:photo.referenceURL]); // [mailer addAttachmentData:imageData mimeType:@"image/jpeg" fileName:[NSString stringWithFormat:@"%i", counter]]; [mailer addAttachmentData:imageData mimeType:@"image/jpeg" fileName:[NSString stringWithFormat:@"a.jpg"]]; counter++; } NSString *emailBody = [self getEmailBody]; [mailer setMessageBody:emailBody isHTML:NO]; [self presentModalViewController:mailer animated:YES]; } 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>and the method that returns the <code>UIImage</code>:</p> <pre><code>#pragma mark - Get Photo from Asset Library + (ALAssetsLibrary *)defaultAssetsLibrary { static dispatch_once_t pred = 0; static ALAssetsLibrary *library = nil; dispatch_once(&pred, ^{ library = [[ALAssetsLibrary alloc] init]; }); return library; } - (UIImage *)getImage:(NSString *)URLReference { __block UIImage *xPhoto = nil; ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset) { UIImage *xImage; // get the image ALAssetRepresentation *rep = [myasset defaultRepresentation]; CGImageRef iref = [rep fullScreenImage]; if (iref) { xImage = [UIImage imageWithCGImage:iref]; } xPhoto = xImage; }; ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror) { NSLog(@"Error fetching photo: %@",[myerror localizedDescription]); }; NSURL *asseturl = [NSURL URLWithString:URLReference]; // create library and set callbacks ALAssetsLibrary *al = [DetailsViewController defaultAssetsLibrary]; [al assetForURL:asseturl resultBlock:resultblock failureBlock:failureblock]; return xPhoto; } </code></pre> <p>NOTE: This above code does run, it simply does not attach the image. Also, note, I am able to successfully attach images from the gallery within my application, as long at I have set them into a <code>UIImageView</code>.Image already (basically, I am taking the pointer to the image from the <code>UIImageView</code> and passing it to the <code>addAttachmentData</code> method.) It is just when I attempt to iterate through Core Data and attach without first setting the image into a <code>UIImageView</code> that I have the trouble.</p> <p>Any tips would be greatly appreciated!</p> <p>Thanks! Jason</p>

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