Take screenshot and send it programmatically

Question

When a user taps on a button in my app, I'd like to take a screenshot of the current view and open up a text message with that screenshot image as an attachment. How can I do this in iOS7?

(I've seen posts on how to take a screenshot but not anything on taking a screenshot and attaching it to a message)

Thanks!

Answer 1

1. For taking a screenshot add the QuartzCore framework, you can use UIGraphicsBeginImageContextWithOptions

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
[self.myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *theImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

NSData *theImageData=UIImageJPEGRepresentation(theImage, 1.0 ); //you can use PNG too

2. For attaching this image in mail, add MessageUI framework in build phase. And use this NSData for attaching, something like this

//Check if mail can be sent
if ([MFMailComposeViewController canSendMail])
    {
        MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
        mailer.mailComposeDelegate = self;

       // Add NSData you got as screenshot to attachment
       [mailer addAttachmentData:theImageData mimeType:@"image/jpeg" fileName:[NSString stringWithFormat:@"test.jpg"]];  
        [self presentModalViewController:mailer animated:YES];

    }

EDIT:

3. Sending image through SMS

    // Will Work only for iOS 7

    MFMessageComposeViewController* messageComposer = [[MFMessageComposeViewController alloc] init];
     messageComposer.messageComposeDelegate = self; // As mentioned by the OP in comments, we have to set messageComposeDelegate to self.
     messageComposer.recipients = [NSArray arrayWithObject:@"123456789"];

 if([MFMessageComposeViewController canSendText])
  {

    if([MFMessageComposeViewController respondsToSelector:@selector(canSendAttachments)] && [MFMessageComposeViewController canSendAttachments])
    {
        NSString* uti = (NSString*)kUTTypeMessage;
        [messageComposer addAttachmentData:theImageData typeIdentifier:uti filename:@"filename.jpg"];
    }

    [self presentViewController:messageComposer animated:YES completion:nil];
  }

Handle the delegate callbacks from MFMessageComposeViewController

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result
{

}