ios - 无法从 NSMutableDictionary iOS 应用程序检索 XMPP JID。

Question

当我在应用程序中收到 XMPP Presence 时，我将其内容添加到 NSMutableDictionary 以将其发送到另一个 ViewController。如果我使用 NSLog 来查看这本字典的内容，我可以看到一切都很好。但是当我从另一个 ViewController 访问这个 NSMutableDictionary 时，我找不到 JID。其余的东西存放得很好。

这就是我在存储 XMPP Presence 内容(即 JID 和名称)时所做的。

 - (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence
 {
     NSString *fromUser = [[presence from]user];      //name of user
     NSString *fromUserJID = [NSString stringWithFormat:@"%@",[presence from]] ;
     NSLog(@"presence from user JID :- %@", fromUserJID);   // This shows the JID.

      [_locationDictionary setObject:fromUser forKey:@"fromUser"];
      [_locationDictionary setObject:fromUserJID forKey:@"fromJID"];
      NSLog(@"locationary dictionary :- %@",_locationDictionary );  // This shows name as well as JID.

       // add to array
    [_presenceArray addObject:_locationDictionary];

现在，当我尝试在另一个 ViewController 中访问它时，我会这样做:-

    NSString *str=view.annotation.title;        //This has the name of the user.
    NSLog(@"annotation title :- %@", str);      
   for (NSDictionary *obj in appDelegate.presenceArray)
   {
       NSString *titleString = [obj objectForKey:@"fromUser"];

       if ([str isEqualToString:titleString])                 //for the same username I need the JID
       {
           NSString *jidString = [obj objectForKey:@"fromJID"];
           [ dict setObject:jidString forKey:@"jid"];      //dict is NSMutableDictionary

           NSLog(@"retrieved jid is :- %@", dict); // THIS IS NULL

Answer 1

[presence from] will give XMPPJid which is NSObject type.

XMPPJID *jid = [presence from];

试试这样获取Jid字符串

NSString *fromUserJID = [[presence from] full];//Will give Jid have user, resource, domain

//OR

NSString *fromUserJID = [presence fromStr]; //Only give Jid of user.