class TextFieldWTitle: UITextField {
	var titleText: String = "" {
		didSet {
			label.text = titleText
		}
	}
	var label = UILabel()
	
	override init(frame: CGRect) {
		super.init(frame: frame)
		self.genericConfigure()
	}
	
	init() {
		super.init(frame: CGRect.zero)
		self.genericConfigure()
	}
	
	required init?(coder: NSCoder) {
		super.init(coder: coder)
		self.genericConfigure()
	}
	
	func configure(text: String,
				   placeholder: String = "") {
		self.text = text
		self.placeholder = placeholder
		if #available(iOS 13.0, *) {
			self.applyStyle13()
		} else {
			self.applyStylePre13()
		}
	}
	
	func genericConfigure() {
		self.borderStyle = .none
		
		self.layer.borderWidth = 1.0
		self.layer.masksToBounds = false // true
		self.layer.cornerRadius = 4.0
		
		self.textAlignment = .left
		
		label.text = "First name"
		label.translatesAutoresizingMaskIntoConstraints = false
		addSubview(label)
		NSLayoutConstraint.activate([
			label.leftAnchor.constraint(equalTo: leftAnchor),
			label.bottomAnchor.constraint(equalTo: topAnchor),
			label.heightAnchor.constraint(equalToConstant: 20.0)
		])
	}
	
	@available(iOS 13.0, *)
	func applyStyle13() {
		self.tintColor = UIColor.label
		self.backgroundColor = UIColor.white
		self.textColor = UIColor.label
		self.attributedPlaceholder = NSAttributedString(
			string: self.placeholder ?? "",
			attributes: [NSAttributedString.Key.foregroundColor: UIColor.tertiaryLabel])
	}
	
	func applyStylePre13() {
		self.tintColor = .yellow
		self.backgroundColor = UIColor.white
		self.textColor = .yellow
		self.attributedPlaceholder = NSAttributedString(
			string: self.placeholder ?? "",
			attributes: [NSAttributedString.Key.foregroundColor: UIColor.yellow])
	}
	
}


class TitleFieldViewController : UIViewController {
	override func loadView() {
		let view = UIView()
		
		view.backgroundColor = .white
		
		let stack = UIStackView()
		//stack.frame = CGRect(x: 150, y: 200, width: 200, height: 200)
		stack.distribution = .fill
		stack.axis = .vertical
		
		let t1 = TextFieldWTitle()
		t1.configure(text: "texta", placeholder: "placeholder")
		let t2 = TextFieldWTitle()
		t2.configure(text: "textb", placeholder: "placeholder")
		
		t2.titleText = "Last name"
		
		stack.addArrangedSubview(t1)
		stack.addArrangedSubview(t2)
		
		view.addSubview(stack)
		
		stack.translatesAutoresizingMaskIntoConstraints = false
		NSLayoutConstraint.activate([
			stack.topAnchor.constraint(equalTo: view.topAnchor, constant: 100),
			stack.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 100),
			stack.widthAnchor.constraint(equalToConstant: 200),
		])
		
		self.view = view

		// run first *without* spacing
		// then run *with* spacing
		//stack.spacing = 40
	}
}

// Present the view controller in the Live View window
PlaygroundPage.current.liveView = TitleFieldViewController()