MFMailComposeViewController发送邮件的实例

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 iPhone API已经提供了系统写邮件界面的接口,使用MFMailComposeViewController，用来显示界面.
 项目中需要添加MessageUi.framework。头文件加入MFMailComposeViewControllerDelegate。#import <MessageUI/MessageUI.h>
 sendMailViewController.m文件的实现：
 - (void)viewDidLoad
 {
     UIButton *button = [UIButton buttonWithType: UIButtonTypeRoundedRect];
     button.frame = CGRectMake(0, 40, 320, 50);
     [button setTitle: @"Mail" forState: UIControlStateNormal];
     [button addTarget: self action: @selector(sendEMail) forControlEvents: UIControlEventTouchUpInside];
     [self.view addSubview: button];
 }

 - (void) alertWithTitle: (NSString *)_title_ msg: (NSString *)msg
 {
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:_title_
                                                     message:msg
                                                    delegate:nil
                                           cancelButtonTitle:@"确定"
                                           otherButtonTitles:nil];
     [alert show];
     [alert release];
 }

 //点击按钮后，触发这个方法
 -(void)sendEMail
 {
     Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));

     if (mailClass != nil)
     {
         if ([mailClass canSendMail])
         {
             [self displayComposerSheet];
         }
         else
         {
             [self launchMailAppOnDevice];
         }
     }
     else
     {
         [self launchMailAppOnDevice];
     }
 }
 //可以发送邮件的话
 -(void)displayComposerSheet
 {
     MFMailComposeViewController *mailPicker = [[MFMailComposeViewController alloc] init];

     mailPicker.mailComposeDelegate = self;

     //设置主题
     [mailPicker setSubject: @"eMail主题"];

     // 添加发送者
     NSArray *toRecipients = [NSArray arrayWithObject: @"[email protected]"];
     //NSArray *ccRecipients = [NSArray arrayWithObjects:@"[email protected]", @"[email protected]", nil];
     //NSArray *bccRecipients = [NSArray arrayWithObject:@"[email protected]", nil];
     [mailPicker setToRecipients: toRecipients];
     //[picker setCcRecipients:ccRecipients];
     //[picker setBccRecipients:bccRecipients];

     // 添加图片
     UIImage *addPic = [UIImage imageNamed: @"123.jpg"];
     NSData *imageData = UIImagePNGRepresentation(addPic);            // png
     // NSData *imageData = UIImageJPEGRepresentation(addPic, 1);    // jpeg
     [mailPicker addAttachmentData: imageData mimeType: @"" fileName: @"123.jpg"];

     NSString *emailBody = @"eMail 正文";
     [mailPicker setMessageBody:emailBody isHTML:YES];

     [self presentModalViewController: mailPicker animated:YES];
     [mailPicker release];
 }
 -(void)launchMailAppOnDevice
 {
     NSString *recipients = @"mailto:[email protected]&subject=my email!";
     //@"mailto:[email protected][email protected],[email protected]&subject=my email!";
     NSString *body = @"&body=email body!";

     NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body];
     email = [email stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

     [[UIApplication sharedApplication] openURL: [NSURL URLWithString:email]];
 }
 - (void)mailComposeController:(MFMailComposeViewController *)controller
           didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
 {
     NSString *msg;

     switch (result)
     {
         case MFMailComposeResultCancelled:
             msg = @"邮件发送取消";
             break;
         case MFMailComposeResultSaved:
             msg = @"邮件保存成功";
             [self alertWithTitle:nil msg:msg];
             break;
         case MFMailComposeResultSent:
             msg = @"邮件发送成功";
             [self alertWithTitle:nil msg:msg];
             break;
         case MFMailComposeResultFailed:
             msg = @"邮件发送失败";
             [self alertWithTitle:nil msg:msg];
             break;
         default:
             break;
     }

     [self dismissModalViewControllerAnimated:YES];
 }