1.导入库文件:MessageUI.framework

                     2.引入头文件

                     3.实现代理<MFMailComposeViewControllerDelegate> 和 <UINavigationControllerDelegate>

@代码示例:

    - (void)didClickSendEmailButtonAction{                    if ([MFMailComposeViewController canSendMail] == YES) {                                MFMailComposeViewController *mailVC = [[MFMailComposeViewController alloc] init];                //  设置代理(与以往代理不同,不是"delegate",千万不能忘记呀,代理有3步)                mailVC.mailComposeDelegate = self;                //  收件人                NSArray *sendToPerson = @[@"humingtao2014@gmail.com"];                [mailVC setToRecipients:sendToPerson];                //  抄送                NSArray *copyToPerson = @[@"humingtao2013@126.com"];                [mailVC setCcRecipients:copyToPerson];                //  密送                NSArray *secretToPerson = @[@"563821250@qq.com"];                [mailVC setBccRecipients:secretToPerson];                //  主题                [mailVC setSubject:@"hello world"];                [self presentViewController:mailVC animated:YES completion:nil];                [mailVC setMessageBody:@"魑魅魍魉,哈哈呵呵嘿嘿霍霍" isHTML:NO];            }else{                            NSLog(@"此设备不支持邮件发送");                        }                }                - (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error{                    switch (result) {                case MFMailComposeResultCancelled:                    NSLog(@"取消发送");                    break;                case MFMailComposeResultFailed:                    NSLog(@"发送失败");                    break;                case MFMailComposeResultSaved:                    NSLog(@"保存草稿文件");                    break;                case MFMailComposeResultSent:                    NSLog(@"发送成功");                    break;                default:                    break;            }                        [self dismissViewControllerAnimated:YES completion:nil];        }                //  系统发送,模拟器不支持,要用真机测试        - (void)didClickSendSystemEmailButtonAction{                    NSURL *url = [NSURL URLWithString:@"humingtao2014@gmail.com"];            if ([[UIApplication sharedApplication] canOpenURL:url] == YES) {                                [[UIApplication sharedApplication] openURL:url];                        }else{                            NSLog(@"此设备不支持");            }                }