Macos NSSharingService发送电子邮件和读取电子邮件正文

我正在使用NsharingService在Mail应用程序中打开电子邮件撰写窗口：

NSSharingService* sharingService = [NSSharingService sharingServiceNamed:NSSharingServiceNameComposeEmail];
[sharingService setRecipients:@[@"test@blahblah.com"]];
[sharingService setSubject:@"Test"];
sharingService.delegate = self;

它会很好地打开“撰写电子邮件”窗口，当我输入一些文本并实际发送电子邮件时，我甚至会收到一个对代理的回调：

- (void)sharingService:(NSSharingService *)sharingService didShareItems:(NSArray *)items {
    NSLog(@"sharingService didShareItems - %@", sharingService.messageBody);
}

问题是它返回的messageBody始终为零。我希望这包含发送的电子邮件的文本。我检查了NSSharingService的头文件：

/* These read-only properties allow for querying of the shared content:
 */
// Message body as string
@property (readonly, copy) NSString *messageBody NS_AVAILABLE_MAC(10_9);
// URL to access the post on Facebook, Twitter, Sina Weibo, etc. (also known as permalink)
@property (readonly, copy) NSURL *permanentLink NS_AVAILABLE_MAC(10_9);
// Account name used for sending on Twitter or Sina Weibo
@property (readonly, copy) NSString *accountName NS_AVAILABLE_MAC(10_9);
// NSArray of NSURL objects representing the file that were shared
@property (readonly, copy) NSArray *attachmentFileURLs NS_AVAILABLE_MAC(10_9);

---

你知道为什么这可能不起作用吗？如果我使用

NSSharingServiceNameComposeMessage

而不是电子邮件，似乎效果不错，但那是用来发送iMessages的

不确定为什么它在您的案例中不起作用，但这或多或少应该是要遵循的标准模式：

@interface sharingServiceDelegate : NSObject <NSSharingServiceDelegate>
@end

@interface sharingServiceDelegate ()
@property NSString *recipientString;
@property NSString *subjectString;
@property NSString *bodyString;
@property NSURL <NSPasteboardWriting> *attachmentURL;
@property NSSharingService *emailSharingService;
@end


@implementation sharingServiceDelegate

- (id)init {

    self = [super init];

    if (self) {
        NSSharingService *emailSharingService = [NSSharingService sharingServiceNamed:NSSharingServiceNameComposeEmail];
        emailSharingService.delegate = self;
        self.emailSharingService = emailSharingService;
    }

    return self;
}

- (BOOL)shareUsingEmail
{
    NSArray *shareItems =@[_bodyString, _attachmentURL];
    self.emailSharingService.recipients = @[_recipientString];
    self.emailSharingService.subject = _subjectString;

    if([self.emailSharingService canPerformWithItems:shareItems]){
        [self.emailSharingService performWithItems:shareItems];
        return TRUE;
    } else {
        // handle failure ...
    }

    return FALSE;
}

@end

---

我不想预先填充电子邮件内容并打开撰写窗口（我可以做得很好）。我指的是在电子邮件实际发送后访问“messageBody”属性，它在头文件中似乎标记为“readonly”，但在消息发送后总是返回nil。

sharingServiceDelegate * shareDelegate = [[sharingServiceDelegate alloc] init];

shareDelegate.recipientString = @"recipient@address.com";
shareDelegate.subjectString = @"a subject";
shareDelegate.bodyString = @"A message body";
shareDelegate.attachmentURL = [NSURL fileURLWithPath:[NSString stringWithCString:file_to_share_path encoding:NSUTF8StringEncoding]];

if([shareDelegate shareUsingEmail]==FALSE)
    NSLog(@"Email Sharing Service failed.\n");
}