Assertion Failure in MFMailComposeInternalViewController

Question

Getting a weird Assertion Failure when presenting an email prompt in iOS

Code:

- (void)displayComposerSheet:(id)delegate withDataSource:(id )datasource {
    MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
    picker.navigationBar.tintColor = self.navigationController.navigationBar.tintColor;
    picker.mailComposeDelegate = delegate;
    //Use the datasource to fill in the email fields
    if ([[datasource recipients] count] > 0)
      [picker setToRecipients:[datasource recipients]];
    [picker setSubject:[datasource subject]];

    [picker setMessageBody:[datasource emailText] isHTML:[datasource isHTML]];
    [[UIWindow topMostController] presentModalViewController:picker animated:YES];
    [picker becomeFirstResponder];

    [picker release];
}

MyApp[60324:907] *** Assertion failure in -[MFMailComposeInternalViewController _endDelayingCompositionPresentation], /SourceCache/MessageUI/MessageUI-1075.10/Mail/MFMailComposeInternalViewController.m:316

FishStix FishStix · Accepted Answer · 2012-11-16T22:26:05

Alas the dangers of swizzling....

I had swizzled UINavigationController's pushViewController method with my own method that internally used setViewControllers. (I had been running into some threading issues where the same view controller got pushed twice.)

Assertion Failure in MFMailComposeInternalViewController

1 Answers