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[logoImageView, welcomeLabel, dismissButton].forEach {
    self.addSubview($0)
    $0.translatesAutoresizingMaskIntoConstraints = false 
}

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addSubviewsUsingAutoLayout(logoImageView, welcomeLabel, dismissButton)

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extension NSLayoutAnchor {

  func test() {}

}

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@objc extension NSLayoutAnchor {

  func test() {}

}

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@objc extension NSLayoutAnchor {

  @discardableResult 
  func constrain(equalTo anchor: NSLayoutAnchor, 
                 with constant: CGFloat = 0.0, 
                 isActive: Bool = true) -> NSLayoutConstraint {

    let constraint = self.constraint(equalTo: anchor, constant: constant)
    constraint.isActive = isActive
    return constraint

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@objc extension NSLayoutAnchor {

  @discardableResult 
  func constrain(_ relation: NSLayoutConstraint.Relation = .equal, 
                 to anchor: NSLayoutAnchor, 
                 with constant: CGFloat = 0.0, 
                 isActive: Bool = true) -> NSLayoutConstraint {

    let constraint: NSLayoutConstraint

pedrommcarrasco

let a = UIView()
let b = UIView()

a.addSubviewsUsingAutoLayout(b)

// Constraint set as equal to a.topAnchor
b.topAnchor.constrain(a.topAnchor)

// Constraint set as greater than or equal to a.bottomAnchor
b.bottomAnchor.constrain(.greaterThanOrEqual, to: a.bottomAnchor)

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extension NSLayoutDimension {

  @discardableResult
  func constrain(_ relation: NSLayoutConstraint.Relation = .equal,
                 to anchor: NSLayoutDimension,
                 with constant: CGFloat = 0.0,
                 multiplyBy multiplier: CGFloat = 1.0,
                 isActive: Bool = true) -> NSLayoutConstraint {

    let constraint: NSLayoutConstraint

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let bWidth = b.widthAnchor.constraint(equalToConstant: 50.0)
bWidth.priority = .defaultHigh
// or if you want between .defaultHigh and .required 👇 🤮
bWidth.priority = UILayoutPriority(UILayoutPriority.defaultHigh.rawValue + 1)

pedrommcarrasco

@objc extension NSLayoutAnchor {

  @discardableResult
  func constrain(_ relation: NSLayoutConstraint.Relation = .equal,
                 to anchor: NSLayoutAnchor,
                 with constant: CGFloat = 0.0,
                 prioritizeAs priority: UILayoutPriority = .required,
                 isActive: Bool = true) -> NSLayoutConstraint {

    let constraint: NSLayoutConstraint