//

class StackTestVC: UIViewController {
	
	let v1 = UILabel()
	let v2 = UILabel()
	let v3 = UILabel()
	
	override func viewDidLoad() {
		super.viewDidLoad()
		
		view.backgroundColor = .systemYellow
		
		let containerView = UIView()
		
		let stackView = UIStackView()
		stackView.axis = .horizontal
		stackView.spacing = 0
		stackView.distribution = .fillEqually
		
		containerView.translatesAutoresizingMaskIntoConstraints = false
		stackView.translatesAutoresizingMaskIntoConstraints = false

		view.addSubview(containerView)
		containerView.addSubview(stackView)
		
		let g = view.safeAreaLayoutGuide
		NSLayoutConstraint.activate([

			containerView.topAnchor.constraint(equalTo: g.topAnchor, constant: 20.0),
			containerView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
			containerView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
			containerView.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -20.0),

			stackView.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 0.0),
			stackView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 0.0),
			stackView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: 0.0),

		])

		let colors: [UIColor] = [
			.systemGreen, .systemBlue, .systemOrange
		]
		let labels: [UILabel] = [
			v1, v2, v3
		]
		var i: Int = 0
		for (v, c) in zip(labels, colors) {
			i += 1
			v.text = "\(i)"
			v.textAlignment = .center
			v.textColor = .white
			v.font = .systemFont(ofSize: 40.0, weight: .regular)
			v.backgroundColor = c
			v.heightAnchor.constraint(equalToConstant: 150.0).isActive = true
			stackView.addArrangedSubview(v)
		}
	
		containerView.backgroundColor = .white
		containerView.layer.cornerRadius = 16
		containerView.layer.borderColor = UIColor.white.cgColor
		containerView.layer.borderWidth = 4
		
		containerView.layer.masksToBounds = true
	}

	override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
		v2.isHidden.toggle()
	}
}