如何从iPhone应用程序发送邮件

Question

我想从我的iPhone应用程序发送电子邮件。我听说iOS SDK没有电子邮件API。我不想使用以下代码，因为它将退出我的应用程序：

NSString *url = [NSString stringWithString: @"mailto:foo@example.com?cc=bar@example.com&subject=Greetings%20from%20Cupertino!&body=Wish%20you%20were%20here!"];
[[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]];

那么如何从我的应用发送电子邮件？

Answer 1

在iOS 3.0及更高版本中，您应该使用隐藏在MessageUI框架中的MFMailComposeViewController类和MFMailComposeViewControllerDelegate协议。

首先添加framework并导入：

#import <MessageUI/MFMailComposeViewController.h>

然后，发送消息：

MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init];
controller.mailComposeDelegate = self;
[controller setSubject:@"My Subject"];
[controller setMessageBody:@"Hello there." isHTML:NO]; 
if (controller) [self presentModalViewController:controller animated:YES];
[controller release];

然后用户完成工作并及时获得委托回调：

- (void)mailComposeController:(MFMailComposeViewController*)controller  
          didFinishWithResult:(MFMailComposeResult)result 
                        error:(NSError*)error;
{
  if (result == MFMailComposeResultSent) {
    NSLog(@"It's away!");
  }
  [self dismissModalViewControllerAnimated:YES];
}

请记住检查设备是否配置为发送电子邮件：

if ([MFMailComposeViewController canSendMail]) {
  // Show the composer
} else {
  // Handle the error
}

Answer 2

MFMailComposeViewController是iPhone OS 3.0软件发布后的发展方式。您可以查看sample code或tutorial I wrote。

Answer 3

我想在此处添加一些内容：

1. 使用mailto URL无法在模拟器中运行，因为模拟器上未安装mail.app。它确实可以在设备上运行。

2. mailto URL的长度有限制。如果URL大于4096个字符，则mail.app将无法启动。

3. OS 3.0中有一个新类，可让您在不离开应用程序的情况下发送电子邮件。请参阅类MFMailComposeViewController。

Answer 4

如果您想从您的应用程序发送电子邮件，除非您在应用程序内编码自己的邮件客户端（SMTP），或让服务器为您发送邮件，否则上述代码是唯一的方法。

例如，您可以编写应用程序代码以调用服务器上的URL，该URL将为您发送邮件。然后，您只需从代码中调用URL。

请注意，使用上述代码，您无法将任何内容附加到SMTP客户端方法允许您执行的电子邮件，以及服务器端方法。

Answer 5

下面的代码在我的应用程序中用于发送带附件的电子邮件，附件是图像。您可以发送任何类型的文件，唯一需要注意的是您必须指定正确的'mimeType “

将此添加到您的.h文件

#import <MessageUI/MFMailComposeViewController.h>

将 MessageUI.framework 添加到项目文件

NSArray *paths = SSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *getImagePath = [documentsDirectory stringByAppendingPathComponent:@"myGreenCard.png"];



MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init];
controller.mailComposeDelegate = self;
[controller setSubject:@"Green card application"];
[controller setMessageBody:@"Hi , <br/>  This is my new latest designed green card." isHTML:YES]; 
[controller addAttachmentData:[NSData dataWithContentsOfFile:getImagePath] mimeType:@"png" fileName:@"My Green Card"];
if (controller)
    [self presentModalViewController:controller animated:YES];
[controller release];

委托方法如下所示

  -(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error;
{
    if (result == MFMailComposeResultSent) {
        NSLog(@"It's away!");
    }
    [self dismissModalViewControllerAnimated:YES];
}

Answer 6

这是可以帮助你的代码但是不要忘记包含消息ui framewark并包含委托方法MFMailComposeViewControllerDelegate

-(void)EmailButtonACtion{

        if ([MFMailComposeViewController canSendMail])
        {
            MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
            controller.mailComposeDelegate = self;
            [controller.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigation_bg_iPhone.png"] forBarMetrics:UIBarMetricsDefault];
            controller.navigationBar.tintColor = [UIColor colorWithRed:51.0/255.0 green:51.0/255.0 blue:51.0/255.0 alpha:1.0];
            [controller setSubject:@""];
            [controller setMessageBody:@" " isHTML:YES];
            [controller setToRecipients:[NSArray arrayWithObjects:@"",nil]];
            UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
            UIImage *ui = resultimg.image;
            pasteboard.image = ui;
            NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(ui)];
            [controller addAttachmentData:imageData mimeType:@"image/png" fileName:@" "];
            [self presentViewController:controller animated:YES completion:NULL];
        }
        else{
            UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"alrt" message:nil delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil] ;
            [alert show];
        }

    }
    -(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
    {

        [MailAlert show];
        switch (result)
        {
            case MFMailComposeResultCancelled:
                MailAlert.message = @"Email Cancelled";
                break;
            case MFMailComposeResultSaved:
                MailAlert.message = @"Email Saved";
                break;
            case MFMailComposeResultSent:
                MailAlert.message = @"Email Sent";
                break;
            case MFMailComposeResultFailed:
                MailAlert.message = @"Email Failed";
                break;
            default:
                MailAlert.message = @"Email Not Sent";
                break;
        }
        [self dismissViewControllerAnimated:YES completion:NULL];
        [MailAlert show];
    }

Answer 7

要从iPhone应用程序发送电子邮件，您需要在下面的任务列表中进行。

第1步：导入#import <MessageUI/MessageUI.h> 在您要发送电子邮件的控制器类中。

步骤2：将代理添加到控制器，如下所示

 @interface <yourControllerName> : UIViewController <MFMessageComposeViewControllerDelegate, MFMailComposeViewControllerDelegate>

第3步：添加以下发送电子邮件的方法。

 - (void) sendEmail {
 // Check if your app support the email.
 if ([MFMailComposeViewController canSendMail]) {
    // Create an object of mail composer.
    MFMailComposeViewController *mailComposer =      [[MFMailComposeViewController alloc] init];
    // Add delegate to your self.
    mailComposer.mailComposeDelegate = self;
    // Add recipients to mail if you do not want to add default recipient then remove below line.
    [mailComposer setToRecipients:@[<add here your recipient objects>]];
    // Write email subject.
    [mailComposer setSubject:@“<Your Subject Here>”];
    // Set your email body and if body contains HTML then Pass “YES” in isHTML.
    [mailComposer setMessageBody:@“<Your Message Body>” isHTML:NO];
    // Show your mail composer.
    [self presentViewController:mailComposer animated:YES completion:NULL];
 }
 else {
 // Here you can show toast to user about not support to sending email.
}
}

第4步：实施MFMailComposeViewController委托

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(nullable NSError *)error {
[controller dismissViewControllerAnimated:TRUE completion:nil];


switch (result) {
   case MFMailComposeResultSaved: {
    // Add code on save mail to draft.
    break;
}
case MFMailComposeResultSent: {
    // Add code on sent a mail.
    break;
}
case MFMailComposeResultCancelled: {
    // Add code on cancel a mail.
    break;
}
case MFMailComposeResultFailed: {
    // Add code on failed to send a mail.
    break;
}
default:
    break;
}
}

Answer 8

Swift 2.2。改编自Esq's answer

import Foundation
import MessageUI

class MailSender: NSObject, MFMailComposeViewControllerDelegate {

    let parentVC: UIViewController

    init(parentVC: UIViewController) {
        self.parentVC = parentVC
        super.init()
    }

    func send(title: String, messageBody: String, toRecipients: [String]) {
        if MFMailComposeViewController.canSendMail() {
            let mc: MFMailComposeViewController = MFMailComposeViewController()
            mc.mailComposeDelegate = self
            mc.setSubject(title)
            mc.setMessageBody(messageBody, isHTML: false)
            mc.setToRecipients(toRecipients)
            parentVC.presentViewController(mc, animated: true, completion: nil)
        } else {
            print("No email account found.")
        }
    }

    func mailComposeController(controller: MFMailComposeViewController,
        didFinishWithResult result: MFMailComposeResult, error: NSError?) {

            switch result.rawValue {
            case MFMailComposeResultCancelled.rawValue: print("Mail Cancelled")
            case MFMailComposeResultSaved.rawValue: print("Mail Saved")
            case MFMailComposeResultSent.rawValue: print("Mail Sent")
            case MFMailComposeResultFailed.rawValue: print("Mail Failed")
            default: break
            }

            parentVC.dismissViewControllerAnimated(false, completion: nil)
    }
}

客户代码：

var ms: MailSender?

@IBAction func onSendPressed(sender: AnyObject) {
    ms = MailSender(parentVC: self)
    let title = "Title"
    let messageBody = "https://stackoverflow.com/questions/310946/how-can-i-send-mail-from-an-iphone-application this question."
    let toRecipents = ["foo@bar.com"]
    ms?.send(title, messageBody: messageBody, toRecipents: toRecipents)
}

Answer 9

Heres一个Swift版本：

import MessageUI

class YourVC: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        if MFMailComposeViewController.canSendMail() {
            var emailTitle = "Vea Software Feedback"
            var messageBody = "Vea Software! :) "
            var toRecipents = ["pj@veasoftware.com"]
            var mc:MFMailComposeViewController = MFMailComposeViewController()
            mc.mailComposeDelegate = self
            mc.setSubject(emailTitle)
            mc.setMessageBody(messageBody, isHTML: false)
            mc.setToRecipients(toRecipents)
            self.presentViewController(mc, animated: true, completion: nil)
        } else {
            println("No email account found")
        }
    }
}

extension YourVC: MFMailComposeViewControllerDelegate {
    func mailComposeController(controller: MFMailComposeViewController!, didFinishWithResult result: MFMailComposeResult, error: NSError!) {
        switch result.value {
        case MFMailComposeResultCancelled.value:
            println("Mail Cancelled")
        case MFMailComposeResultSaved.value:
            println("Mail Saved")
        case MFMailComposeResultSent.value:
            println("Mail Sent")
        case MFMailComposeResultFailed.value:
            println("Mail Failed")
        default:
            break
        }
        self.dismissViewControllerAnimated(false, completion: nil)
    }
}

Source

Answer 10

我写了一个名为KRNSendEmail的简单包装器，它简化了向一个方法调用发送电子邮件的信息。

KRNSendEmail有详细记录并添加到CocoaPods。

https://github.com/ulian-onua/KRNSendEmail