非常慢的MFMailComposeViewController Delegate

使我的场景成为邮件代理:

@interface MyLayer : CCLayer <MFMailComposeViewControllerDelegate> {
    ...
}

并在场景中实现了以下功能:

-(void) showEmailWindow: (id) sender {
    [[CCDirector sharedDirector] pause];

    MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
    picker.mailComposeDelegate = self;

    [picker setSubject: @"My subject here"];

    NSString *emailBody = @"<h1>Here is my email!</h1>";

    [picker setMessageBody:emailBody isHTML:YES];

    [myMail presentModalViewController:picker animated:NO];
    [picker release];

}

我还实现了mailComposeController来处理回调。