iOS 发送邮件

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IOS系统框架提供的两种发送Email的方法：openURL 和 MFMailComposeViewController。借助这两个方法，我们可以轻松的在应用里加入如用户反馈这类需要发送邮件的功能。

1.openURL
使用openURL调用系统邮箱客户端是我们在IOS3.0以下实现发邮件功能的主要手段。我们可以通过设置url里的相关参数来指定邮件的内容，不过其缺点很明显，这样的过程会导致程序暂时退出。下面是使用openURL来发邮件的一个小例子：
   1.   #pragma mark - 使用系统邮件客户端发送邮件
   2.   -(void)launchMailApp
   3.   {
   4.        NSMutableString *mailUrl = [[[NSMutableString alloc]init]autorelease];
   5.        //添加收件人
   6.        NSArray *toRecipients = [NSArray arrayWithObject: @"first@example.com"];
   7.        [mailUrl appendFormat:@"mailto:%@", [toRecipients componentsJoinedByString:@","]];
   8.        //添加抄送
   9.        NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];
   10.        [mailUrl appendFormat:@"?cc=%@", [ccRecipients componentsJoinedByString:@","]];
   11.        //添加密送
   12.        NSArray *bccRecipients = [NSArray arrayWithObjects:@"fourth@example.com", nil];
   13.        [mailUrl appendFormat:@"&bcc=%@", [bccRecipients componentsJoinedByString:@","]];
   14.        //添加主题
   15.        [mailUrl appendString:@"&subject=my email"];
   16.        //添加邮件内容
   17.        [mailUrl appendString:@"&body=<b>email</b> body!"];
   18.        NSString* email = [mailUrl stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
   19.        [[UIApplication sharedApplication] openURL: [NSURL URLWithString:email]];
   20.   }

2.MFMailComposeViewController
MFMailComposeViewController是在IOS3.0新增的一个接口，它在MessageUI.framework中。通过调用MFMailComposeViewController，可以把邮件发送窗口集成到我们的应用里，发送邮件就不需要退出程序了。MFMailComposeViewController的使用方法：
       1.项目中引入MessageUI.framework；
       2.在使用的文件中导入MFMailComposeViewController.h头文件；
       3.实现MFMailComposeViewControllerDelegate，处理邮件发送事件；
       4.调出邮件发送窗口前先使用MFMailComposeViewController里的“+ (BOOL)canSendMail”方法检查用户是否设置了邮件账户；
       5.初始化MFMailComposeViewController，构造邮件体

   1.   //
   2.   //  ViewController.h
   3.   //  MailDemo
   4.   //
   5.   //  Created by LUOYL on 12-4-4.
   6.   //  Copyright (c) 2012年 http://luoyl.info. All rights reserved.
   7.   //
   8.
   9.   #import <UIKit/UIKit.h>
   10.   #import <MessageUI/MFMailComposeViewController.h>
   11.
   12.   @interface ViewController : UIViewController<MFMailComposeViewControllerDelegate>
   13.
   14.   @end

   1.   #pragma mark - 在应用内发送邮件
   2.   //激活邮件功能
   3.   - (void)sendMailInApp
   4.   {
   5.        Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
   6.        if (!mailClass) {
   7.            [self alertWithMessage:@"当前系统版本不支持应用内发送邮件功能，您可以使用mailto方法代替"];
   8.            return;
   9.        }
   10.        if (![mailClass canSendMail]) {
   11.            [self alertWithMessage:@"用户没有设置邮件账户"];
   12.            return;
   13.        }
   14.        [self displayMailPicker];
   15.   }
   16.
   17.   //调出邮件发送窗口
   18.   - (void)displayMailPicker
   19.   {
   20.        MFMailComposeViewController *mailPicker = [[MFMailComposeViewController alloc] init];
   21.        mailPicker.mailComposeDelegate = self;
   22.
   23.        //设置主题
   24.        [mailPicker setSubject: @"eMail主题"];
   25.        //添加收件人
   26.        NSArray *toRecipients = [NSArray arrayWithObject: @"first@example.com"];
   27.        [mailPicker setToRecipients: toRecipients];
   28.        //添加抄送
   29.        NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];
   30.        [mailPicker setCcRecipients:ccRecipients];
   31.        //添加密送
   32.        NSArray *bccRecipients = [NSArray arrayWithObjects:@"fourth@example.com", nil];
   33.        [mailPicker setBccRecipients:bccRecipients];
   34.
   35.        // 添加一张图片
   36.        UIImage *addPic = [UIImage imageNamed: @"Icon@2x.png"];
   37.        NSData *imageData = UIImagePNGRepresentation(addPic);            // png
   38.        //关于mimeType：http://www.iana.org/assignments/media-types/index.html
   39.        [mailPicker addAttachmentData: imageData mimeType: @"" fileName: @"Icon.png"];
   40.
   41.        //添加一个pdf附件
   42.        NSString *file = [self fullBundlePathFromRelativePath:@"高质量C++编程指南.pdf"];
   43.        NSData *pdf = [NSData dataWithContentsOfFile:file];
   44.        [mailPicker addAttachmentData: pdf mimeType: @"" fileName: @"高质量C++编程指南.pdf"];
   45.
   46.        NSString *emailBody = @"<font color='red'>eMail</font> 正文";
   47.        [mailPicker setMessageBody:emailBody isHTML:YES];
   48.        [self presentModalViewController: mailPicker animated:YES];
   49.        [mailPicker release];
   50.   }
   51.
   52.   #pragma mark - 实现 MFMailComposeViewControllerDelegate
   53.   - (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
   54.   {
   55.        //关闭邮件发送窗口
   56.        [self dismissModalViewControllerAnimated:YES];
   57.        NSString *msg;
   58.        switch (result) {
   59.            case MFMailComposeResultCancelled:
   60.                msg = @"用户取消编辑邮件";
   61.                break;
   62.            case MFMailComposeResultSaved:
   63.                msg = @"用户成功保存邮件";
   64.                break;
   65.            case MFMailComposeResultSent:
   66.                msg = @"用户点击发送，将邮件放到队列中，还没发送";
   67.                break;
   68.            case MFMailComposeResultFailed:
   69.                msg = @"用户试图保存或者发送邮件失败";
   70.                break;
   71.            default:
   72.                msg = @"";
   73.                break;
   74.        }
   75.        [self alertWithMessage:msg];
   76.   }

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