In App Email - MFMailComposeViewController - Error Message - objective-c

Question

My code is as follows:
ViewController.m:
#import "ViewController.h"
#import "MyScene.h"
#import "MainMenu.h"
#import <MessageUI/MessageUI.h>
#implementation ViewController
- (IBAction)showMailPicker:(id)sender
{
// You must check that the current device can send email messages before you
// attempt to create an instance of MFMailComposeViewController. If the
// device can not send email messages,
// [[MFMailComposeViewController alloc] init] will return nil. Your app
// will crash when it calls -presentViewController:animated:completion: with
// a nil view controller.
if ([MFMailComposeViewController canSendMail])
// The device can send email.
{
[self displayMailComposerSheet];
}
else
// The device can not send email.
{
self.feedbackMsg.hidden = NO;
self.feedbackMsg.text = #"Device not configured to send mail.";
}
}
- (IBAction)showSMSPicker:(id)sender
{
// You must check that the current device can send SMS messages before you
// attempt to create an instance of MFMessageComposeViewController. If the
// device can not send SMS messages,
// [[MFMessageComposeViewController alloc] init] will return nil. Your app
// will crash when it calls -presentViewController:animated:completion: with
// a nil view controller.
if ([MFMessageComposeViewController canSendText])
// The device can send email.
{
[self displaySMSComposerSheet];
}
else
// The device can not send SMS.
{
self.feedbackMsg.hidden = NO;
self.feedbackMsg.text = #"Device not configured to send SMS.";
}
}
- (void)displayMailComposerSheet
{
MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
[picker setSubject:#"Support for Brick Smasher Extreme"];
// Set up recipients
NSArray *toRecipients = [NSArray arrayWithObject:#"help.bricksx#gmail.com"];
//NSArray *ccRecipients = [NSArray arrayWithObjects:#"second#example.com", #"third#example.com", nil];
//NSArray *bccRecipients = [NSArray arrayWithObject:#"fourth#example.com"];
[picker setToRecipients:toRecipients];
//[picker setCcRecipients:ccRecipients];
//[picker setBccRecipients:bccRecipients];
// Attach an image to the email
//NSString *path = [[NSBundle mainBundle] pathForResource:#"rainy" ofType:#"jpg"];
//NSData *myData = [NSData dataWithContentsOfFile:path];
//[picker addAttachmentData:myData mimeType:#"image/jpeg" fileName:#"rainy"];
// Fill out the email body text
NSString *emailBody = #"Message:";
[picker setMessageBody:emailBody isHTML:YES];
//[self presentViewController:picker animated:YES completion:NULL];
[[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:picker
animated:YES
completion:nil];
}
- (void)mailComposeController:(MFMailComposeViewController *)controller
didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
self.feedbackMsg.hidden = NO;
// Notifies users about errors associated with the interface
switch (result)
{
case MFMailComposeResultCancelled:
self.feedbackMsg.text = #"Result: Mail sending canceled";
break;
case MFMailComposeResultSaved:
self.feedbackMsg.text = #"Result: Mail saved";
break;
case MFMailComposeResultSent:
self.feedbackMsg.text = #"Result: Mail sent";
break;
case MFMailComposeResultFailed:
self.feedbackMsg.text = #"Result: Mail sending failed";
break;
default:
self.feedbackMsg.text = #"Result: Mail not sent";
break;
}
[self dismissViewControllerAnimated:YES completion:NULL];
}
#end
The error is: Warning: Attempt to present <MFMailComposeViewController: 0xbf95170> on <UIViewController: 0xbf78d10> whose view is not in the window hierarchy!
I'm trying to send email through my app. Using MFMailComposeViewController, it always gives an error (above). But when I use the SMS part, there is no problem at all.
Using: Xcode 5, iOS 7, iPhone Retina 4"

Answer 1

Your problem is likely here:
[[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:
First of all, you're already calling this from a ViewController, so you can just [self presentViewController:]. It does sound like maybe you're calling your displayMailComposerSheet before ViewController's view is visible (viewDidLoad or viewWillAppear maybe), which would raise the error you're seeing.

Answer 2

use
[self presentViewController:picker animated:YES completion:nil];
instead of
[[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:picker animated:YES completion:nil];