序言：app內(nèi)部調(diào)用系統(tǒng)郵件發(fā)送和分享文件，其中文件作為郵件附件發(fā)送的email目標(biāo)地址饿肺，使用了MessageUI Framework蒋困。

• 查看MessageUI框架，包含<MessageUI/MFMailComposeViewController.h>
  <MessageUI/MFMessageComposeViewController.h>敬辣，前者是郵件發(fā)送雪标，后者是短信發(fā)送零院，設(shè)計(jì)架構(gòu)都是一致的。今天我主要整理郵件發(fā)送和分享文件村刨。
• 使用的簡(jiǎn)要步驟暫且如下表述：

  1.判斷系統(tǒng)是否配置郵箱賬戶等告抄；
  2.MFMailComposeViewController實(shí)例并設(shè)置代理(需要注意是：代理屬性是mailComposeDelegate，不是delegate嵌牺，如果不小心寫(xiě)成了delegate就是UINavigationControllerDelegate的代理打洼，而不是我們要的MFMailComposeViewControllerDelegate)，并實(shí)現(xiàn)代理方法逆粹，處理取消發(fā)送募疮、發(fā)送成功及發(fā)送失敗等情況。
  3.設(shè)置郵件主題僻弹、收件人阿浓、抄送和密送人等，這些也可以在稍后彈出來(lái)的系統(tǒng)UI由用戶自行輸入或添加蹋绽。
  4.通過(guò)addAttachmentData設(shè)置郵件的附件數(shù)據(jù)芭毙，也就是我們要發(fā)送和分享的文件。
  5.將以上定制的MFMailComposeViewController實(shí)例實(shí)例present出來(lái)卸耘。

• 以下是具體實(shí)現(xiàn)的代碼

##pragma mark - 郵件分享方法
#- (void)shareByEmail{
            MFMailComposeViewController *mailSender = [[MFMailComposeViewController alloc]init];
            mailSender.mailComposeDelegate = self;
            [mailSender setSubject:NKLocalizedString(@"EmailFromMyApp")];
            //以下為具體業(yè)務(wù)代碼
            data = [NSData dataWithContentsOfFile:path];//文件數(shù)據(jù)
            NSString *extension;//文件類(lèi)型識(shí)別字符串退敦，如文件擴(kuò)展名
            NSString *mimeType = nil;//這個(gè)不能錯(cuò)，錯(cuò)了的話會(huì)閃退
                if ([extension isEqualToString:@"MOV"] || [extension isEqualToString:@"MP4"]) {
                    mimeType = @"video/quicktime";
                }else if ([extension isEqualToString:@"MP3"] || [extension isEqualToString:@"M4A"]) {
                    mimeType = @"audio/mpeg3";
                }else if ([extension isEqualToString:@"JPG"] || [extension isEqualToString:@"JPEG"]) {
                    mimeType = @"image/jpeg";
                }else if ([extension isEqualToString:@"PNG"]) {
                    mimeType = @"image/png";
                }else if ([extension isEqualToString:@"TXT"]) {
                    mimeType = @"text/plain";
                }else if ([extension isEqualToString:@"PDF"]) {
                    mimeType = @"application/pdf";
                }else if ([extension isEqualToString:@"DOC"] || [extension isEqualToString:@"DOCX"]) {
                    mimeType = @"application/msword";
                }else if ([extension isEqualToString:@"XLS"] || [extension isEqualToString:@"XLSX"]) {
                    mimeType = @"application/vnd.ms-exceld";
                }else if ([extension isEqualToString:@"PPT"] || [extension isEqualToString:@"PPTX"]) {
                    mimeType = @"application/vnd.ms-powerpoint";
                }else if ([extension isEqualToString:@"ZIP"]) {
                    mimeType = @"application/zip";
                }else{
                    return ;
                }
                [mailSender addAttachmentData:data mimeType:mimeType fileName:name];
            }
            [self presentViewController:mailSender animated:YES completion:nil];
}

##pragma mark - MFMailComposeViewControllerDelegate
#- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    [controller dismissViewControllerAnimated:YES completion:nil];
    switch (result) {
        case MFMailComposeResultCancelled:
        {
        }
            break;
        case MFMailComposeResultSaved:
        {
        }
            break;
        case MFMailComposeResultSent:
        {
            showAlertMessage(nil, LocalizedString(@"HaveSent"));
        }
            break;
        case MFMailComposeResultFailed:
        {
        }
            break;
    }
}