如何在XMPP中从MUC删除或退出

Question

当前，我正在进行聊天应用程序，并且我需要删除特定群组聊天。 对于删除组，我尝试使用以下解决方案，但无法正常工作。请检查此代码

    -(void)ExitGroup:(NSString *)Roomjdi Removeuserid:(NSString *)Userid {
    {
        XMPPJID *roomJID = [XMPPJID jidWithString:Roomjdi];
        XMPPRoomMemoryStorage *roomMemoryStorage = [[XMPPRoomMemoryStorage alloc] init];
        XMPPRoom *xmppRooms = [[XMPPRoom alloc]
                               initWithRoomStorage:roomMemoryStorage
                               jid:roomJID
                               dispatchQueue:dispatch_get_main_queue()];

        [xmppRooms removeDelegate:self delegateQueue:dispatch_get_main_queue()];
        [self deactivate:roomJID];
        [self leaveRoom:roomJID];

    }

- (void)leaveRoom:(XMPPJID *)myRoomJID
{
   // dispatch_block_t block = ^{ @autoreleasepool {

        //XMPPLogTrace();

        // <presence type='unavailable' to='darkcave@chat.shakespeare.lit/thirdwitch'/>

    XMPPPresence *presence = [XMPPPresence presence];
    [presence addAttributeWithName:@"to" stringValue:[myRoomJID full]];
    [presence addAttributeWithName:@"type" stringValue:@"unavailable"];
    [xmppStream sendElement:presence];
    [xmppRoom leaveRoom];
    [xmppRoom deactivate];
    [xmppRoom  removeDelegate:self];
}

我执行了此方法后，但是在组列表中已屏蔽的在线显示用户中。请告诉我我哪里错了。