IOS自带Email的两种方法实例详解

IOS自带Email的两种方法实例详解

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：
#pragma mark - 使用系统邮件客户端发送邮件

-(void)launchMailApp
{
  NSMutableString *mailUrl = [[[NSMutableString alloc]init]autorelease];
  //添加收件人
  NSArray *toRecipients = [NSArray arrayWithObject: @"first@example.com"];
  [mailUrl appendFormat:@"mailto:%@", [toRecipients componentsJoinedByString:@","]];
  //添加抄送
  NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];
  [mailUrl appendFormat:@"?cc=%@", [ccRecipients componentsJoinedByString:@","]];
  //添加密送
  NSArray *bccRecipients = [NSArray arrayWithObjects:@"fourth@example.com", nil];
  [mailUrl appendFormat:@"&bcc=%@", [bccRecipients componentsJoinedByString:@","]];
  //添加主题
  [mailUrl appendString:@"&subject=my email"];
  //添加邮件内容
  [mailUrl appendString:@"&body=<b>email</b> body!"];
  NSString* email = [mailUrl stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
  [[UIApplication sharedApplication] openURL: [NSURL URLWithString:email]];
}

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

//
// ViewController.h
// MailDemo
//
// Created by LUOYL on 12-4-4.
// Copyright (c) 2012年 http://luoyl.info. All rights reserved.
//  

#import <UIKit/UIKit.h>
#import <MessageUI/MFMailComposeViewController.h>  

@interface ViewController : UIViewController<MFMailComposeViewControllerDelegate>  

@end

#pragma mark - 在应用内发送邮件
//激活邮件功能
- (void)sendMailInApp
{
  Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
  if (!mailClass) {
    [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"];
    return;
  }
  if (![mailClass canSendMail]) {
    [self alertWithMessage:@"用户没有设置邮件账户"];
    return;
  }
  [self displayMailPicker];
}  

//调出邮件发送窗口
- (void)displayMailPicker
{
  MFMailComposeViewController *mailPicker = [[MFMailComposeViewController alloc] init];
  mailPicker.mailComposeDelegate = self;   

  //设置主题
  [mailPicker setSubject: @"eMail主题"];
  //添加收件人
  NSArray *toRecipients = [NSArray arrayWithObject: @"first@example.com"];
  [mailPicker setToRecipients: toRecipients];
  //添加抄送
  NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];
  [mailPicker setCcRecipients:ccRecipients];
  //添加密送
  NSArray *bccRecipients = [NSArray arrayWithObjects:@"fourth@example.com", nil];
  [mailPicker setBccRecipients:bccRecipients];   

  // 添加一张图片
  UIImage *addPic = [UIImage imageNamed: @"Icon@2x.png"];
  NSData *imageData = UIImagePNGRepresentation(addPic);      // png
  //关于mimeType：http://www.iana.org/assignments/media-types/index.html
  [mailPicker addAttachmentData: imageData mimeType: @"" fileName: @"Icon.png"];   

  //添加一个pdf附件
  NSString *file = [self fullBundlePathFromRelativePath:@"高质量C++编程指南.pdf"];
  NSData *pdf = [NSData dataWithContentsOfFile:file];
  [mailPicker addAttachmentData: pdf mimeType: @"" fileName: @"高质量C++编程指南.pdf"];   

  NSString *emailBody = @"<font color='red'>eMail</font> 正文";
  [mailPicker setMessageBody:emailBody isHTML:YES];
  [self presentModalViewController: mailPicker animated:YES];
  [mailPicker release];
}  

#pragma mark - 实现 MFMailComposeViewControllerDelegate
- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
  //关闭邮件发送窗口
  [self dismissModalViewControllerAnimated:YES];
  NSString *msg;
  switch (result) {
    case MFMailComposeResultCancelled:
      msg = @"用户取消编辑邮件";
      break;
    case MFMailComposeResultSaved:
      msg = @"用户成功保存邮件";
      break;
    case MFMailComposeResultSent:
      msg = @"用户点击发送，将邮件放到队列中，还没发送";
      break;
    case MFMailComposeResultFailed:
      msg = @"用户试图保存或者发送邮件失败";
      break;
    default:
      msg = @"";
      break;
  }
  [self alertWithMessage:msg];
}