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];
}
