Hey everyone.. I have a slightly different solution that preserves the scrolling of the tableView with a smaller tableView size.

Declare dropDownHeight like annjawm added.

  public var dropDownHeight: CGFloat = 0.0 {
      didSet { setNeedsUpdateConstraints() }
  }

Instead of updating the tableHeight property, update the constraints instead. Replace updateConstraints() method with the following:

   public override func updateConstraints() {
        if !didSetupConstraints {
            setupConstraints()
        }
        
        didSetupConstraints = true
        
        let layout = computeLayout()
        
        if !layout.canBeDisplayed {
            super.updateConstraints()
            hide()
            return
        }
        
        xConstraint.constant = layout.x
        yConstraint.constant = layout.y
        widthConstraint.constant = layout.width
        
        // Change height of dropdown
        if dropDownHeight > 0 && dropDownHeight <= layout.visibleHeight {
            heightConstraint.constant = dropDownHeight
        } else {
            heightConstraint.constant = layout.visibleHeight
        }
        
        // Enable scrolling if offscreen content or dropdown height is set
        tableView.isScrollEnabled = layout.offscreenHeight > 0 || dropDownHeight > 0
        
        DispatchQueue.main.async { [weak self] in
            self?.tableView.flashScrollIndicators()
        }
        
        super.updateConstraints()
   }

Hope this is helpful... 👍

Height of the pop up #34

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