Swift 为不同视图创建布局时出现问题

我正在构建一个tableview，它在不同的tableview单元格中具有不同的视图，这取决于它从模型接收到的输入，即如果文本出来，则只有一个文本字段，或者如果图像出来，则只有一个图像。我以编程方式编程视图，并设置了约束条件。当我运行程序时，我看到了我所期望的，但当我上下滚动时，一切都变得一团糟。当我滚动更多的时候，一切都变得一样，不管它应该包含什么。我知道我做错了什么，我可能不得不使用prepareforeuse，但我不知道如何解决这个问题。非常感谢您的任何意见。非常感谢你。这是我的代码片段

var otherUserProfileImageLeftConstraint:NSLayoutConstraint

var otherUserProfileImageBottomConstraint : NSLayoutConstraint!

var otherUserProfileImageHeightConstraint : NSLayoutConstraint!

var otherUserProfileImageWidthConstraint : NSLayoutConstraint!

// rightViewforholiding

var rightViewLeftConstraintN : NSLayoutConstraint!

var rightViewBottomConstraintN : NSLayoutConstraint!

var rightViewHeightConstraintN : NSLayoutConstraint!

var rightViewWidthConstraintN : NSLayoutConstraint!


//imageInside the rightView

var messageImageImageWidthConstraint : NSLayoutConstraint!

var messageImageImageHeightConstraint : NSLayoutConstraint!

// playButton

var playButRightConstraint : NSLayoutConstraint!

var playButTopConstraint : NSLayoutConstraint!

var playButWidthtConstraint : NSLayoutConstraint!

var playButHeightConstraint : NSLayoutConstraint!

// activity indicator

var activityXAnchorConstraint : NSLayoutConstraint!

var activityYAnchorConstraint : NSLayoutConstraint!

var activityHeightAnchorConstraint : NSLayoutConstraint!

var activityWidthAnchorConstraint : NSLayoutConstraint!

// time stamp

var timeStampTopConstraint : NSLayoutConstraint!

var timeStampBottomConstraint : NSLayoutConstraint!

var timeStampLeftConstraint : NSLayoutConstraint!

var timeStampRightConstraint : NSLayoutConstraint!

// text label

var textLabelWidthConstraint : NSLayoutConstraint!

var textLabelHeightConstraintN : NSLayoutConstraint!

var Chatchellin:messageIn{

    didSet {

        let textToShow = chatCellIn?.text


        if chatCellIn?.from != Auth.auth().currentUser?.uid {

            // MARK: New implementation start

            // THIS IS THE OTHER USER

            if textToShow == "" {
                // we have either the video or the image coming in

                let videoURL = chatCellIn?.videoURL

                let pictureURL = chatCellIn?.imageURL


                if videoURL != nil && pictureURL != nil {

                    // this is where we have the video

                    // we need image on the rightview - that contains just the image and the time label + userLeftImage



                    otherUserProfileImageLeftConstraint.isActive = true

                    otherUserProfileImageWidthConstraint.isActive = true

                    otherUserProfileImageHeightConstraint.isActive = true

                    otherUserProfileImageBottomConstraint.isActive = true

                    rightViewLeftConstraintN.isActive = true

                    rightViewBottomConstraintN.isActive = true

                    rightViewHeightConstraintN.isActive = true

                    rightViewWidthConstraintN.isActive = true

                    messageImageImageHeightConstraint.isActive = true

                    messageImageImageWidthConstraint.isActive = true

                    timeStampRightConstraint.isActive = true

                    timeStampLeftConstraint.isActive = true

                    timeStampTopConstraint.isActive = true

                    timeStampBottomConstraint.isActive = true


                } else if videoURL == nil && pictureURL != nil {

                    // this is where we have the picture

                    // we need just the image and the time label and the activity indictor and the play button + userLeftImage


                    otherUserProfileImageLeftConstraint.isActive = true

                    otherUserProfileImageWidthConstraint.isActive = true

                    otherUserProfileImageHeightConstraint.isActive = true

                    otherUserProfileImageBottomConstraint.isActive = true

                    rightViewLeftConstraintN.isActive = true

                    rightViewBottomConstraintN.isActive = true

                    rightViewHeightConstraintN.isActive = true

                    rightViewWidthConstraintN.isActive = true

                    messageImageImageHeightConstraint.isActive = true

                    messageImageImageWidthConstraint.isActive = true

                    timeStampRightConstraint.isActive = true

                    timeStampLeftConstraint.isActive = true

                    timeStampTopConstraint.isActive = true

                    timeStampBottomConstraint.isActive = true


                }




            } else {

                // we have the text here

                // we need just the text label and the time label + userLeftImage



                otherUserProfileImageLeftConstraint.isActive = true

                otherUserProfileImageWidthConstraint.isActive = true

                otherUserProfileImageHeightConstraint.isActive = true

                otherUserProfileImageBottomConstraint.isActive = true

                rightViewLeftConstraintN.isActive = true

                rightViewBottomConstraintN.isActive = true

                rightViewHeightConstraintN.isActive = true

                rightViewWidthConstraintN.isActive = true

                messageImageImageHeightConstraint.isActive = false

                messageImageImageWidthConstraint.isActive = false

                timeStampRightConstraint.isActive = false

                timeStampLeftConstraint.isActive = false

                timeStampTopConstraint.isActive = false

                timeStampBottomConstraint.isActive = false



            }


        } else {

// ////标记：此消息来自当前用户

            // MARK: NEW IMPLEMENTATION START





            if textToShow == "" {
                // we have either the video or the image coming in

                let videoURL = chatCellIn?.videoURL

                let pictureURL = chatCellIn?.imageURL


                if videoURL != nil && pictureURL != nil {

                    // this is where we have the video

                    // we need image on the rightview - that contains just the image and the time label + userLeftImage



                    otherUserProfileImageLeftConstraint.isActive = true

                    otherUserProfileImageWidthConstraint.isActive = true

                    otherUserProfileImageHeightConstraint.isActive = true

                    otherUserProfileImageBottomConstraint.isActive = true

                    rightViewLeftConstraintN.isActive = false

                    rightViewBottomConstraintN.isActive = false

                    rightViewHeightConstraintN.isActive = false

                    rightViewWidthConstraintN.isActive = false

                    messageImageImageHeightConstraint.isActive = false

                    messageImageImageWidthConstraint.isActive = false

                    timeStampRightConstraint.isActive = false

                    timeStampLeftConstraint.isActive = false

                    timeStampTopConstraint.isActive = false

                    timeStampBottomConstraint.isActive = false


                } else if videoURL == nil && pictureURL != nil {

                    // this is where we have the picture

                    // we need just the image and the time label and the activity indictor and the play button + userLeftImage


                    otherUserProfileImageLeftConstraint.isActive = true

                    otherUserProfileImageWidthConstraint.isActive = true

                    otherUserProfileImageHeightConstraint.isActive = true

                    otherUserProfileImageBottomConstraint.isActive = true

                    rightViewLeftConstraintN.isActive = false

                    rightViewBottomConstraintN.isActive = false

                    rightViewHeightConstraintN.isActive = false

                    rightViewWidthConstraintN.isActive = false

                    messageImageImageHeightConstraint.isActive = false

                    messageImageImageWidthConstraint.isActive = false

                    timeStampRightConstraint.isActive = false

                    timeStampLeftConstraint.isActive = false

                    timeStampTopConstraint.isActive = false

                    timeStampBottomConstraint.isActive = false


                }




            } else {

                // we have the text here

                // we need just the text label and the time label + userLeftImage



                otherUserProfileImageLeftConstraint.isActive = true

                otherUserProfileImageWidthConstraint.isActive = true

                otherUserProfileImageHeightConstraint.isActive = true

                otherUserProfileImageBottomConstraint.isActive = true

                rightViewLeftConstraintN.isActive = false

                rightViewBottomConstraintN.isActive = false

                rightViewHeightConstraintN.isActive = false

                rightViewWidthConstraintN.isActive = false

                messageImageImageHeightConstraint.isActive = false

                            messageImageImageWidthConstraint.isActive = false

                            timeStampRightConstraint.isActive = false

                            timeStampLeftConstraint.isActive = false

                            timeStampTopConstraint.isActive = false

                            timeStampBottomConstraint.isActive = false



            }



        }


    }
}

func newAddview（）{

重写init（样式：UITableViewCell.CellStyle，reuseIdentifier:String？）{ init（样式：style，reuseIdentifier:reuseIdentifier）

//对于tableview实现

func tableView（tableView:UITableView，cellForRowAt indexath:indexPath）->UITableViewCell{

    let cell = chatTableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath) as! ChatSceneTableViewCell
    
   cell.chatCellIn = messageArrayToDisplay[indexPath.row]
    
   
    return cell
    
    
}

   newAddview()
  
   }

    let cell = chatTableView.dequeueReusableCell(withIdentifier: cellID, for: indexPath) as! ChatSceneTableViewCell
    
   cell.chatCellIn = messageArrayToDisplay[indexPath.row]
    
   
    return cell
    
    
}