Question

I use MFMailComposeViewController to send mail in my app. But when present mail compose view controller, all of navigation buttons are disabled (except back button in select mail address screen), i must use Home button to quit app. Does anyone has idea?
Here is screen shot:

Code:

- (void)shareVieEmail
{
    if ([MFMailComposeViewController canSendMail]) {
        MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
        mailViewController.mailComposeDelegate = self;
        [mailViewController setSubject:@"Test subject"];
        [mailViewController setMessageBody:@"Mail message body" isHTML:NO];

        NSData *imageData = [NSData dataWithContentsOfFile:photourl];
        [mailViewController addAttachmentData:imageData mimeType:@"image/jpg" fileName:@"example_photo"];
        [self presentModalViewController:mailViewController animated:YES];
    } else {
        [[[UIAlertView alloc] initWithTitle:@"Cannot send mail" message:@"Device is unable to send email in its current state" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
    }
}

Delegate method :

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    switch (result)
    {
        case MFMailComposeResultCancelled:
            //NSLog(@"Result: canceled");
            break;
        case MFMailComposeResultSaved:
            //NSLog(@"Result: saved");
            break;
        case MFMailComposeResultSent:
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Result" message:@"Mail Sent Successfully" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
        }
            break;
        case MFMailComposeResultFailed:
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Result" message:@"Mail Sent Failed" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
        }
            break;
        default:
            //NSLog(@"Result: not sent");
            break;
    }
    if (error) {
        [[[UIAlertView alloc] initWithTitle:@"Cannot send mail" message:[NSString stringWithFormat:@"ERROR:%@", [error userInfo]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
    }
    [self dismissModalViewControllerAnimated:YES];
}

And in header file, I declared implement MFMailComposeViewControllerDelegate.

Answer 1

I had exactly the same problem. and it took me a while to figure this out but no surprise it came down to customized UIBarButtonItem

I bet in your UIBarButtonItem.h there is a method

-(void)setEnabled:(BOOL)enabled ;

and the implementation looks like this:

-(void)setEnabled:(BOOL)enabled {
    if (self.customView) {
        if ([[self.customView.subviews objectAtIndex:0] isKindOfClass:[UIButton class]])         {
            ((UIButton*)[self.customView.subviews objectAtIndex:0]).enabled = enabled;
        }
    }
}

and this is causing problem so as soon as you comment out this method your problem should go away.