最近通過學習瞭解到一個東西就是tableView可以自動的計算行高了，只需要配合autoLayout來使用就可以了

先設定如下所示的程式碼

 //先設定預估行高
       tableView.estimatedRowHeight = 200
      //再設定自動計算行高
      tableView.rowHeight = UITableViewAutomaticDimension

比如說這樣子，我們設定了高度的約束，頂部的約束，然後最下面那個控制元件我設定了頂部的約束和底部的約束

  //2、自動佈局，新增頂部的約束
       contentView.addConstraint(NSLayoutConstraint(item: statusCellTopView, attribute:.top, relatedBy: .equal, toItem: contentView, attribute: .top, multiplier: 1, constant: 0))
       //新增左邊的約束
       contentView.addConstraint(NSLayoutConstraint(item: statusCellTopView, attribute: .left, relatedBy: .equal, toItem: contentView, attribute: .left, multiplier: 1, constant: 0))
       //新增右邊的約束
       contentView.addConstraint(NSLayoutConstraint(item: statusCellTopView, attribute: .right, relatedBy: .equal, toItem: contentView, attribute: .right, multiplier: 1, constant: 0))
       //新增高度的約束
        contentView.addConstraint(NSLayoutConstraint(item: statusCellTopView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant:CGFloat(WBCellMargin+WBCellIconViewWH)))
        
       //新增正文的頂部約束
        contentView.addConstraint(NSLayoutConstraint(item: ContentText, attribute: .top, relatedBy: .equal, toItem:statusCellTopView, attribute: .bottom, multiplier: 1, constant: CGFloat(WBCellMargin)))
       //新增正文的左邊的約束
        contentView.addConstraint(NSLayoutConstraint(item: ContentText, attribute: .left, relatedBy: .equal, toItem: contentView, attribute: .left, multiplier: 1, constant: CGFloat(WBCellMargin)))
        //設定底部的約束
        contentView.addConstraint(NSLayoutConstraint(item: ContentText, attribute: .bottom, relatedBy: .equal, toItem: contentView, attribute: .bottom, multiplier: 1, constant: CGFloat(-WBCellMargin)))