Set button width to fit dynamic button title - ios

Question

I have my UI structured say Level 1(UP), Level 2(DOWN) with some controls
In level 1, I have a label L1
In level 2, I have a button and label L2
In level 2 my button may be removed in runtime and I wanted my label L2 to be aligned to leading edge as L1
I'm facing two problems here
When I set my button title programmatically, I want to set my button such that its width grows when text increases and reduces its width when there is less text content. This isn't happening. Please see below screens the constraints I've in place
When I removed my button from superview, I wanted my L2 label Leading to be aligned to L1 leading. So I created a constraint from L2.leading = L1.leading and prioirty is 999
In this case, the button gets reduces its size to almost 0 even if i have text in that. Please advice me setting this up

Answer 1

Problem #1:
use .horizontal UIStackview for the button and text. set its distribution to .fill. For the button set contentCompression resistance priority to .required for .horizontal & set contenHugging priority to .required for .horizontal. So the Button will always wrap the text no matter what.
Problem #2:
While placing inside a stackview, you don't have to remove the button from superview. Just hide it using isHidden.
Code Demonstration
class SampleVC: UIViewController {
private var didAddConstraint = false
// Basic Views
private let label: UILabel = {
let view = UILabel()
view.translatesAutoresizingMaskIntoConstraints = false
view.text = "Label"
return view
}()
private let topButton: UIButton = {
let view = UIButton()
view.translatesAutoresizingMaskIntoConstraints = false
view.setTitle("Button", for: .normal)
view.setTitleColor(.gray, for: .highlighted)
view.backgroundColor = .green
view.setContentHuggingPriority(.required, for: .horizontal)
view.setContentCompressionResistancePriority(.required, for: .horizontal)
return view
}()
private let rightLabel: UILabel = {
let view = UILabel()
view.translatesAutoresizingMaskIntoConstraints = false
view.numberOfLines = 0
view.text = "label"
view.backgroundColor = .red
return view
}()
private lazy var stackview: UIStackView = {
let view = UIStackView()
view.translatesAutoresizingMaskIntoConstraints = false
view.axis = .horizontal
view.distribution = .fill
view.addArrangedSubview(topButton)
view.addArrangedSubview(rightLabel)
return view
}()
override func loadView() {
super.loadView()
view.addSubview(label)
view.addSubview(stackview)
view.setNeedsUpdateConstraints()
view.backgroundColor = .white
}
override func updateViewConstraints() {
super.updateViewConstraints()
if didAddConstraint == false {
didAddConstraint = true
// top label
label.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 16.0).isActive = true
label.topAnchor.constraint(equalTo: view.topAnchor, constant: 20).isActive = true
label.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
// stackview
stackview.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 16.0).isActive = true
stackview.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 8.0).isActive = true
stackview.rightAnchor.constraint(equalToSystemSpacingAfter: view.rightAnchor, multiplier: 16.0).isActive = true
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// TEST Code
// topButton.setTitle("TEST TEST TEST", for: .normal)
// topButton.isHidden = true
}
}