Swift 3 dynamic button height depends on title length in scrollable stackview - ios

Question

I want to create scrollview with radiobuttons/checkbox buttons. I tried different ways working with scrollview and stackview, but here are my issues:
Problem: multiline works fine, but button frame doesn`t work
Problem: multiline title and buttons dynamic height doesn't work; dynamic stackview height in scroll view works fine
Question: how can I make button depends on titleHeight works with scrollable stackview
private func testDynamicBtnHeight() {
scrollView.translatesAutoresizingMaskIntoConstraints = false
mVScrollContainer.addSubview(scrollView)
mVScrollContainer.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[scrollView]|", options: .alignAllCenterX, metrics: nil, views: ["scrollView": scrollView]))
mVScrollContainer.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[scrollView]|", options: .alignAllCenterX, metrics: nil, views: ["scrollView": scrollView]))
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.axis = .vertical
scrollView.addSubview(stackView)
scrollView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[stackView]", options: NSLayoutFormatOptions.alignAllCenterX, metrics: nil, views: ["stackView": stackView]))
scrollView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[stackView]|", options: NSLayoutFormatOptions.alignAllCenterX, metrics: nil, views: ["stackView": stackView]))
for i in 0 ... 30 {
var btn1 = RadioButtonMock.mockRadioButton(title: "A B C D", backgroundColor: UIColor.green)
var btn2 = RadioButtonMock.mockRadioButton(title: " 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ", backgroundColor: UIColor.red)
var btn3 = RadioButtonMock.mockRadioButton(title: "B B B B B B B", backgroundColor: UIColor.blue)
stackView.addArrangedSubview(btn1)
stackView.addArrangedSubview(btn2)
stackView.addArrangedSubview(btn3)
if i == 9 {
let url = URL(string: "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQacMIFnZ2xZ_ZH7CjdUzzqpsMHwLSiF98lGWVWVHy6Am5qm2mq")
let data = try? Data(contentsOf: url!)
if let imageData = data {
let ivImage = UIImageView()
ivImage.image = UIImage(data: imageData)
ivImage.frame = CGRect(x: 0, y: 0, width: 100, height: 200)
stackView.addArrangedSubview(ivImage)
}
}
}
//mSvContainer.heightAnchor.constraint(equalToConstant: 400)
}
Radio button code:
static func mockRadioButton(title: String, backgroundColor: UIColor) -> RadioButton {
NSLog(TAG + " mockRadioButton(title: String, backgroundColor: UIColor)")
// min requirements to display simple checkBox
let rb = RadioButton()
rb.setTitle(title, for: .normal)
rb.setTitleColor(.black, for: .normal)
//cb.addTarget(self, action: #selector(checkBoxParamTap(sender:)), for: .touchUpInside)
rb.isChecked = false
rb.registerClickListener()
// title advanced
rb.titleLabel?.numberOfLines = 0 //multiline
//debug
rb.backgroundColor = backgroundColor
NSLog(TAG + "ccccc \(rb.bounds.size.height)")
//size
//rb.heightAnchor.constraint(equalToConstant: 30).isActive = true
//let contentSize = self.txtVDetails.sizeThatFits(self.txtVDetails.bounds.size)
//rb.frame = CGRect(x: 10, y: 10, width: 200, height: 50) //doesnt work
rb.heightAnchor.constraint(equalToConstant: 40).isActive = true //works fine
//rb.sizeToFit()
//rb.layoutIfNeeded()
rb.contentEdgeInsets.top = 8
//cb.contentEdgeInsets.right = 16
rb.contentEdgeInsets.left = 8
rb.contentEdgeInsets.bottom = 8
return rb
}