Email composure iOS 8 | 易学教程

问题

I'm trying to open email composure in iOS 8 from Xcode 6, but getting an error. The same code is working fine if I'm trying from Xcode 5. Later I downloaded a sample code from apple developer portal:

https://developer.apple.com/library/content/samplecode/MessageComposer/Introduction/Intro.html

But the result is same. Is there something, or some setting, I'm missing to optimise the code for Xcode 6

Here is the code: in my button action

MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];

picker.mailComposeDelegate = self;

[picker setSubject:@"Hello from California!"];

// Set up recipients
NSArray *toRecipients = [NSArray arrayWithObject:@"first@example.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 = @"It is raining in sunny California!";
[picker setMessageBody:emailBody isHTML:NO];

[self presentViewController:picker animated:YES completion:NULL];

email delegate

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];

result:

email composure delegate disappearing automatically with result 0, i.e., MFMailComposeResultCancelled

with error codes : MessageComposer[10993:196902] viewServiceDidTerminateWithError: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "The operation couldn’t be completed. (_UIViewServiceInterfaceErrorDomain error 3.)" UserInfo=0x7b93f7e0 {Message=Service Connection Interrupted}

and