发送邮件

原文：http://blog.csdn.net/wuzehai02/article/details/7915596

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：

-(void)launchMailApp   {        
NSMutableString *mailUrl = [[[NSMutableString alloc]init]autorelease];      

//添加收件人      

NSArray *toRecipients = [NSArray arrayWithObject: @"[email protected]"];       
[mailUrl appendFormat:@"mailto:%@", [toRecipients componentsJoinedByString:@","]];      

//添加抄送      

NSArray *ccRecipients = [NSArray arrayWithObjects:@"[email protected]", @"[email protected]", nil];      

[mailUrl appendFormat:@"?cc=%@", [ccRecipients componentsJoinedByString:@","]];      

//添加密送      

NSArray *bccRecipients = [NSArray arrayWithObjects:@"[email protected]", nil];        

[mailUrl appendFormat:@"&bcc=%@", [bccRecipients componentsJoinedByString:@","]];      

//添加主题      

[mailUrl appendString:@"&subject=my email"];      

//添加邮件内容      

[mailUrl appendString:@"&body=emailbody!"];      

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 

#import

@interface ViewController : UIViewController

@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: @"[email protected]"];       
[mailPicker setToRecipients: toRecipients];        

//添加抄送      

NSArray *ccRecipients = [NSArray arrayWithObjects:@"[email protected]", @"[email protected]", nil];        

[mailPicker setCcRecipients:ccRecipients];            

//添加密送      

NSArray *bccRecipients = [NSArray arrayWithObjects:@"[email protected]", nil];        

[mailPicker setBccRecipients:bccRecipients];                

// 添加一张图片        

UIImage *addPic = [UIImage imageNamed: @"[email protected]"];        

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 = @"eMail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];  

}