如何在Xcode6中setToRecipients MFMailComposerViewController

Question

我正在使用Xcode 6。

我正在使用MFMailComposerViewController在应用程序中发送电子邮件。

我可以调用MFMailComposerViewController，它提供发送电子邮件的标准接口。

我也可以设置主题。

但我无法设置收件人。

这是我的代码。

if ([MFMailComposeViewController canSendMail]) {

   mailComposer = [[MFMailComposeViewController alloc]init];
   [mailComposer setSubject:@"PSA Mobile CRM"];
   NSArray *toRecipients = [NSArray arrayWithObject:@"abc@mass.uk.net"];
   [mailComposer setToRecipients:toRecipients];

   mailComposer.mailComposeDelegate = self;
   [self presentViewController:mailComposer animated:YES completion:nil];  
}

else {       
   NSLog(@"This device cannot send email");   
}

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult (MFMailComposeResult)result error:(NSError *)error {  
   switch (result) {

      case MFMailComposeResultSent:          
      NSLog(@"You sent the email.");     
      break;

      case MFMailComposeResultSaved:     
      NSLog(@"You saved a draft of this email");     
      break;

      case MFMailComposeResultCancelled:    
      NSLog(@"You cancelled sending this email.");     
      break;

      case MFMailComposeResultFailed:    
      NSLog(@"Mail failed:  An error occurred when trying to compose this email");     
      break;

      default:     
      NSLog(@"An error occurred when trying to compose this email");  
      break;
  }

 [self dismissViewControllerAnimated:YES completion:NULL]; }

我可以发送电子邮件。 但我无法设置setToRecipients方法。

有人可以帮我解决这个问题吗？