bringSubviewToFront not working with dropdown view (UIView)

Question

I have a dropdown view (it'a UIView with a UITableView fully embedded in it). The top anchor is programmatically constrained to the bottom anchor of a UIButton so that when you touch the button, the dropdown view opens. See code below

However, my problem lies in the fact that the height of the open dropdown view is 150, and the only part shown of the view is the part inside the UITableViewCell (see image), with the bottom part hidden behind the cell.

func genderDropdownViewConfig() {
    genderDropdownView.backgroundColor = .red
    genderDropdownView.frame = CGRect(x: 0, y: 0, width: 0, height: 0)
    genderDropdownView.translatesAutoresizingMaskIntoConstraints = false
    genderDropdownButton.addSubview(genderDropdownView)
    //genderDropdownButton.bringSubview(toFront: genderDropdownView)
    //tableView.cellForRow(at: IndexPath(row: 2, section: 0))?.superview?.addSubview(genderDropdownView)
    //tableView.cellForRow(at: IndexPath(row: 2, section: 0))?.superview?.bringSubview(toFront: genderDropdownView)

    genderDropdownButton.addSubview(genderDropdownView)
    tableView.bringSubview(toFront: genderDropdownButton)

    genderDropdownView.topAnchor.constraint(equalTo: genderDropdownButton.bottomAnchor).isActive = true
    genderDropdownView.centerXAnchor.constraint(equalTo: genderDropdownButton.centerXAnchor).isActive = true
    genderDropdownView.widthAnchor.constraint(equalTo: genderDropdownButton.widthAnchor).isActive = true
    //genderDropdownHeight = genderDropdownView.heightAnchor.constraint(equalToConstant: 0)
    genderDropdownHeight = genderDropdownView.heightAnchor.constraint(equalToConstant: 0)

    for subview in genderDropdownView.subviews {
        subview.backgroundColor = .clear
    }
}

Answer 1

Your cell's height size needs to be redefined by your dropDownView. It seems that your cell contentView's height don't have any connection with your dropDownView's height to reform itself.

I think you should update the height after the button tapped. You can try this code to update your cell's height.

cell.contentView.size.height = dropDownView.frame.origin.y + dropDownView.frame.height