 
     private func tryInsertInActiveNewMessages() {
 
-        if inActiveNewMessageIDSet.count > 0 {
-            updateConversationCollectionViewWithMessageIDs(Array(inActiveNewMessageIDSet), messageAge: .New, scrollToBottom: false, success: { _ in
+        if inactiveNewMessageIDSet.count > 0 {
+            updateConversationCollectionViewWithMessageIDs(Array(inactiveNewMessageIDSet), messageAge: .New, scrollToBottom: false, success: { _ in
             })
 
-            inActiveNewMessageIDSet = []
-
-            println("insert inActiveNewMessageIDSet to CollectionView")
+            inactiveNewMessageIDSet = []
+
+            println("insert inactiveNewMessageIDSet to CollectionView")
         }
     }
 


        } else {
            // 不然就先记下来
            for messageID in filteredMessageIDs {
                inActiveNewMessageIDSet.insert(messageID)
                println("inActiveNewMessageIDSet insert: \(messageID)")
            }
        }
    }


    var lastTimeMessagesCount: Int = 0

    // 位于后台时收到的消息
    private var inactiveNewMessageIDSet = Set<String>()

    var conversationCollectionViewHasBeenMovedToBottomOnce = false

