iphone - 将收到的 XMPP 消息存储在 NSMutableDictionary 中

Question

我正在使用 Robbie Hanson 的 XMPP 框架设计一个 iOS 聊天应用程序:https://github.com/robbiehanson/XMPPFramework

我可以使用以下代码将发送的消息存储到字典中，该字典是我的表格 View 的数据源:

- (IBAction)sendMessage {

    NSString *messageStr = messageField.text;
    if([messageStr length] > 0) {
        NSXMLElement *body = [NSXMLElement elementWithName:@"body"];
        [body setStringValue:messageStr];
        NSXMLElement *message = [NSXMLElement elementWithName:@"message"];
        [message addAttributeWithName:@"type" stringValue:@"chat"];
        [message addAttributeWithName:@"to" stringValue:chatWithUser];
        [message addChild:body];
        [[[self appDelegate] xmppStream] sendElement:message];

        NSMutableDictionary *m = [[NSMutableDictionary alloc] init];
        [m setObject:messageStr forKey:@"msg"];
        [m setObject:@"you" forKey:@"sender"];
        [messages addObject:m];
        [self.tView reloadData];
    }
}

但是 didReceiveMessage 是在 AppDelegate 内部定义的，我无法将收到的消息存储在本地字典中，因此无法在 TableView 中显示。我的 didReceiveMessage 函数如下所示:

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
{
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);

    // A simple example of inbound message handling.

    if ([message isChatMessageWithBody])
    {
        XMPPUserCoreDataStorageObject *user = [xmppRosterStorage userForJID:[message from]
                                                                 xmppStream:xmppStream
                                                       managedObjectContext:[self managedObjectContext_roster]];

        NSString *messageBody = [[message elementForName:@"body"] stringValue];
        NSString *displayName = [user jidStr];

        if ([[UIApplication sharedApplication] applicationState] == UIApplicationStateActive)
        {

            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:displayName
                                                              message:messageBody
                                                             delegate:nil 
                                                    cancelButtonTitle:@"Ok" 
                                                    otherButtonTitles:nil];
            [alertView show];

        }
        else
        {
            // We are not active, so use a local notification instead
            UILocalNotification *localNotification = [[UILocalNotification alloc] init];
            localNotification.alertAction = @"Ok";
            localNotification.alertBody = [NSString stringWithFormat:@"From: %@\n\n%@",displayName,messageBody];

            [[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
        }
    }
}

如何将消息存储到定义了 sendMessage 的 ChatViewController.m 内的消息字典中？

Answer 1

您可以激活名为 XMPPMessageArchiving 的模块。使用此模块，您可以保存所有传出和传入的消息(发送/接收的消息)。

XMPPMessageArchivingCoreDataStorage *xmppMessageStorage = [XMPPMessageArchivingCoreDataStorage sharedInstance];
XMPPMessageArchiving *xmppMessageArchiving = [[XMPPMessageArchiving alloc] initWithMessageArchivingStorage:xmppMessageStorage];

[xmppMessageArchiving activate:xmppStream];
[xmppMessageArchiving addDelegate:self delegateQueue:dispatch_get_main_queue()];

此扩展是 XEP 136 ( http://xmpp.org/extensions/xep-0136.html )，您可以使用 XMPPFramework 中包含的所有类。顺便说一句，如果您在 TableView Controller 中显示所有消息，则可以在每次插入新对象(即发送或接收新消息)时使用 NSFetchedResultController 刷新该 TableView 。