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

my code follows:

viewcontroller.m:

#import "viewcontroller.h" #import "myscene.h" #import "mainmenu.h" #import <messageui/messageui.h>  @implementation viewcontroller  - (ibaction)showmailpicker:(id)sender {  // must check current device can send email messages before  // attempt create instance of mfmailcomposeviewcontroller.  if  // device can not send email messages,  // [[mfmailcomposeviewcontroller alloc] init] return nil.  app  // crash when calls -presentviewcontroller:animated:completion:  // nil view controller.  if ([mfmailcomposeviewcontroller cansendmail])       // device can send email.  {       [self displaymailcomposersheet];  }  else       // device can not send email.  {       self.feedbackmsg.hidden = no;       self.feedbackmsg.text = @"device not configured send mail.";  } }   - (ibaction)showsmspicker:(id)sender {  // must check current device can send sms messages before  // attempt create instance of mfmessagecomposeviewcontroller.  if  // device can not send sms messages,  // [[mfmessagecomposeviewcontroller alloc] init] return nil.  app  // crash when calls -presentviewcontroller:animated:completion:  // nil view controller.  if ([mfmessagecomposeviewcontroller cansendtext])       // device can send email.  {       [self displaysmscomposersheet];  }  else       // device can not send sms.  {       self.feedbackmsg.hidden = no;       self.feedbackmsg.text = @"device not configured send sms.";  } }   - (void)displaymailcomposersheet {  mfmailcomposeviewcontroller *picker = [[mfmailcomposeviewcontroller alloc] init];  picker.mailcomposedelegate = self;   [picker setsubject:@"support brick smasher extreme"];   // set 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 image email  //nsstring *path = [[nsbundle mainbundle] pathforresource:@"rainy" oftype:@"jpg"];  //nsdata *mydata = [nsdata datawithcontentsoffile:path];  //[picker addattachmentdata:mydata mimetype:@"image/jpeg" filename:@"rainy"];   // fill out 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 errors associated 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 present <mfmailcomposeviewcontroller: 0xbf95170> on <uiviewcontroller: 0xbf78d10> view not in window hierarchy!

i'm trying send email through app. using mfmailcomposeviewcontroller, gives error (above). when use sms part, there no problem @ all.

using: xcode 5, ios 7, iphone retina 4"

your problem here: [[[[[uiapplication sharedapplication] delegate] window] rootviewcontroller] presentviewcontroller:

first of all, you're calling viewcontroller, can [self presentviewcontroller:]. sound maybe you're calling displaymailcomposersheet before viewcontroller's view visible (viewdidload or viewwillappear maybe), raise error you're seeing.