Iphone 需要关于xcode中邮件生成器的帮助吗

我在上有警告，下面有错误消息。请帮忙

从不兼容的类型“MyViewController”分配给“id”

和

类“MyViewController”未实现“MFMailComposeViewController”协议

代码是

-(void)displayComposerSheet 

{

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

//below bold code is warning 

    **picker.mailComposeDelegate = self;**

[picker setSubject:@"My first apps!"];


// Set up recipients
NSArray *toRecipients = [NSArray arrayWithObjects: nil]; 


[picker setToRecipients:toRecipients];

[picker setMessageBody:TextView.text isHTML:NO];

[self presentModalViewController:picker animated:YES];

[picker release];

}

---

问题在于错误显示：您的类

MyViewController

不符合

MFMailComposeViewControllerDelegate

协议。您的接口线应如下所示：

@interface MyViewController : UIViewController <MFMailComposeViewControllerDelegate>

@接口MyViewController:UIViewController

当然，您应该确保在类中实现

mailComposeController:didFinishWithResult:error: