         conversationCollectionView.bounces = true
 
         messageToolbarBottomConstraint.constant = 0
-        moreMessageTypesViewHeightConstraint.constant = moreMessageTypesViewHeightConstraintConstant
+        moreMessageTypesViewHeightConstraint.constant = moreMessageTypesViewDefaultHeight
 
         keyboardMan.animateWhenKeyboardAppear = { [weak self] appearPostIndex, keyboardHeight, keyboardHeightIncrement in
 

            if let strongSelf = self {

                if strongSelf.messageToolbar.state == .MoreMessages {
                    strongSelf.conversationCollectionView.contentOffset.y -= keyboardHeight - strongSelf.moreMessageTypesViewHeightConstraintConstant
                    strongSelf.conversationCollectionView.contentInset.bottom = strongSelf.messageToolbar.frame.height + strongSelf.moreMessageTypesViewHeightConstraintConstant

                    strongSelf.messageToolbarBottomConstraint.constant = strongSelf.moreMessageTypesViewHeightConstraintConstant
                    strongSelf.view.layoutIfNeeded()

                } else {


                    // 注意第一次要减去已经有的高度偏移
                    if appearPostIndex == 0 {
                        strongSelf.conversationCollectionView.contentOffset.y += keyboardHeightIncrement - strongSelf.moreMessageTypesViewDefaultHeight
                    } else {
                        strongSelf.conversationCollectionView.contentOffset.y += keyboardHeightIncrement
                    }
