目标 C：在不离开应用程序的情况下发送电子邮件

Question

如何在不离开应用的情况下在应用内发送电子邮件。

这行得通：

-(void) sendEmailTo:(NSString *)to withSubject:(NSString *)subject withBody:(NSString *)body {
NSString *mailString = [NSString stringWithFormat:@"mailto:?to=%@&subject=%@&body=%@",
                        [to stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding],
                        [subject stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding],
                        [body stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:mailString]];
}

但会转到邮件应用程序发送。有没有办法在不离开应用的情况下做到这一点？

Answer 1

是的。使用MFMailComposeViewController。

// From within your active view controller
if([MFMailComposeViewController canSendMail]) {
    MFMailComposeViewController *mailCont = [[MFMailComposeViewController alloc] init];
    mailCont.mailComposeDelegate = self;

    [mailCont setSubject:@"yo!"];
    [mailCont setToRecipients:[NSArray arrayWithObject:@"joel@stackoverflow.com"]];
    [mailCont setMessageBody:@"Don't ever want to give you up" isHTML:NO];
    [self presentViewController:mailCont animated:YES completion:nil];

}


// Then implement the delegate method
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    [self dismissViewControllerAnimated:YES completion:nil];
}

Answer 2

1. 添加 MessageUI 框架：

   • 点击项目
   • 选择“构建阶段”
   • 扩展“将二进制文件与库链接”
   • 点击“+”，输入“Message”，找到“MessageUI”框架，然后添加。

2. 在当前视图控制器中添加导入并实现协议：

   #import <MessageUI/MessageUI.h> 
   #import <MessageUI/MFMailComposeViewController.h> 
   @interface MyViewController : UIViewController<MFMailComposeViewControllerDelegate>
   

添加方法：

    -(void)sendEmail {
        // From within your active view controller
        if([MFMailComposeViewController canSendMail]) {
            MFMailComposeViewController *mailCont = [[MFMailComposeViewController alloc] init];
            mailCont.mailComposeDelegate = self;        // Required to invoke mailComposeController when send

            [mailCont setSubject:@"Email subject"];
            [mailCont setToRecipients:[NSArray arrayWithObject:@"myFriends@email.com"]];
            [mailCont setMessageBody:@"Email message" isHTML:NO];

            [self presentViewController:mailCont animated:YES completion:nil];
        }
    }

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

Answer 3

已针对 iOS 6 进行了更新。请注意，这使用了 ARC，并且不使用已弃用的模态视图演示：

#import <MessageUI/MessageUI.h> 
#import <MessageUI/MFMailComposeViewController.h> 
@interface MyViewController : UIViewController<MFMailComposeViewControllerDelegate>

然后是显示电子邮件屏幕的代码：

- (IBAction)emailButtonPushed:(id)sender {

    if([MFMailComposeViewController canSendMail]) {
        MFMailComposeViewController *mailCont = [[MFMailComposeViewController alloc] init];
        mailCont.mailComposeDelegate = self;
        [mailCont setSubject:@"Your email"];
        [mailCont setMessageBody:[@"Your body for this message is " stringByAppendingString:@" this is awesome"] isHTML:NO];
        [self presentViewController:mailCont animated:YES completion:nil];
    }

}

- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    //handle any error
    [controller dismissViewControllerAnimated:YES completion:nil];
}