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Using MFMailComposeViewController

I am having a problem using MFMailComposeViewController. Here is an example of the code I tried to run on the device. I intentionally added a delay of 5 seconds (just to simulate the experience of downloading a file for attachment), after which the application is a "mail" controller. During the delay, if we press the home button, that is, we will make the application launch in the background and resume the application for up to 5 seconds, the subject field will be empty, and the message body will have the value “message 1” rather than “message 2” "and if we hide the application and resume it after 5 seconds, the subject will not appear, but the body will be" message2 ", not" message 1. "Could you help me understand the behavior.

-(void) func:(MFMailComposeViewController *) mail
{
    [mail setMessageBody:@"message 2" isHTML:NO];
    [self presentModalViewController:mail animated:YES];    
} 

- (IBAction)action:(id)sender 
{
    MFMailComposeViewController * mail = [[MFMailComposeViewController alloc] init];
    [mail setMailComposeDelegate:self];
    [mail setMessageBody:@"message 1" isHTML:NO];
    [mail setSubject:@"subject 1"];

  dispatch_async(dispatch_get_main_queue(), ^{    
        [self performSelector:@selector(func:) withObject:mail afterDelay:5];     
  });
}

+3
1

!

-(IBAction)email {
    MFMailComposeViewController *composer = [[MFMailComposeViewController alloc] init];
    [composer setMailComposeDelegate:self];
    if ([MFMailComposeViewController canSendMail]) {
        [composer setToRecipients:[NSArray arrayWithObjects:@"", nil]];
        [composer setSubject:@""];
        [composer setMessageBody:@"" isHTML:NO];
        [composer setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
        [self presentModalViewController:composer animated:YES];
        [composer release];
    }
    else
        [composer release];
}
-1

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