Question

I am using the MessageUI framework to send and image via e-mail after taking the photo using UIImagePickerController. When I take the photo and then invoke the mail mail message interface I get the compose window. When testing on an iPod touch (iOS 4.3.5) and iPad (iOS 5.0.1) I see the image attachment in the body of the compose window. When testing on an iPhone (4S iOS 5.0.1) the image does not appear in the compose window, but rather I see a box the size of the image attachment with an embedded small blue box with a “?” in it.

In both cases when the mail message is sent the image appears in the message received in the Mail app – iOS devices and Mac.

What can I do to fix this?

UPDATE: I’ve worked around this by changing:

NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(imageToSend)]

to:

NSData *imageDataJPG = [NSData dataWithData:UIImageJPEGRepresentation(imageToSend, 1.0)];

I can’t see in the UIKit docs that there is anything in UIImagePNGRepresentation that would not work on an iPhone …

(Xcode 4.2.1, ARC, 5.0 SDK, Deploy target 4.3)

Here is the code for composing the message:

-(void)displayComposerSheet
{
MFMailComposeViewController *mailPicker = [[MFMailComposeViewController alloc] init];
mailPicker.mailComposeDelegate = self;

[mailPicker setSubject:@"Photo"];

NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(imageToSend)];
[mailPicker addAttachmentData:imageData mimeType:@"image/png" fileName:@"Photo"];


// Fill out the email body text.

NSString *line1 = [NSString stringWithFormat: @"I took this photo on my %@.\n", [[UIDevice currentDevice] model]];


NSString *body = [NSString stringWithFormat:@"%@", line1];
[mailPicker setMessageBody:body isHTML:NO];

// Present the mail composition interface.
[self presentModalViewController:mailPicker animated:YES];

}

Answer 1

The image size is restricted so if the image you are sending through is greater than a certain dimension you’ll get the effect you describe above.

I had a look at my own code and saw I had

#define MAX_MAIL_DIM 1536

Which seems to be 1024 * 1.5. Sorry I can’t remember how I arrived at that number but I suspect it was trial and error.