我在我的应用程序中使用 MFMailComposeViewController 并且邮件发送部分似乎没问题。但是当我离开邮件应用程序时，事情就出错了：
- one toolbar (UIToolbar object) has disappeared.
- one pointer (UIImageView*) has become nil, without me doing anything for that to happen.
换句话说，调用环境发生了变化，尽管我不希望它发生变化。我的错误在哪里？
这是我的代码，以防有人看到错误：
- (void)mailComposeController:(MFMailComposeViewController*)controller
didFinishWithResult:(MFMailComposeResult)result
error:(NSError*)error
{
[controller dismissModalViewControllerAnimated:YES];
}
-(IBAction)sendAsEMail {
MFMailComposeViewController *mailComposeViewController=[[MFMailComposeViewController alloc] init];
mailComposeViewController.mailComposeDelegate=self;
[mailComposeViewController setSubject:@"Mail subject"];
[mailComposeViewController setMessageBody:@"This is for you !" isHTML:NO];
[mailComposeViewController addAttachmentData:
[NSData dataWithContentsOfFile:[[My_ViewController getDocDir] stringByAppendingPathComponent:
[pictureNames objectAtIndex:userItemSelected]]]
mimeType:@"image/png" fileName:@"Picture.png"];
if (mailComposeViewController) [self presentModalViewController:mailComposeViewController animated:YES];
[mailComposeViewController release];
}
感谢您提供任何相关信息。