Power-Up Your Anchors - Before

power-up-your-anchors.swift

// Subviews
let logoImageView = UIImageView()
let welcomeLabel = UILabel()
let dismissButton = UIButton()

// Add Subviews & Set view's translatesAutoresizingMaskIntoConstraints to false
[logoImageView, welcomeLabel, dismissButton].forEach {
    self.addSubview($0)
    $0.translatesAutoresizingMaskIntoConstraints = false 
}

// Set Constraints
logoImageView.topAnchor.constraint(equalTo: topAnchor, constant: 12).isActive = true
logoImageView.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
logoImageView.widthAnchor.constraint(equalToConstant: 50).isActive = true
logoImageView.heightAnchor.constraint(equalToConstant: 50).isActive = true

dismissButton.leadingAnchor.constraint(greaterThanOrEqualTo: leadingAnchor, constant: 12).isActive = true
dismissButton.trailingAnchor.constraint(lessThanOrEqualTo: trailingAnchor, constant: -12).isActive = true
dismissButton.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
let dismissButtonWidth = dismissButton.widthAnchor.constraint(equalToConstant: 320)
dismissButtonWidth.priority = UILayoutPriority(UILayoutPriority.defaultHigh.rawValue + 1)
dismissButtonWidth.isActive = true

welcomeLabel.topAnchor.constraint(equalTo: logoImageView.bottomAnchor, constant: 12).isActive = true
welcomeLabel.bottomAnchor.constraint(greaterThanOrEqualTo: dismissButton.topAnchor, constant: 12).isActive = true
welcomeLabel.leadingAnchor.constraint(equalTo: dismissButton.leadingAnchor).isActive = true
welcomeLabel.trailingAnchor.constraint(equalTo: dismissButton.trailingAnchor).isActive = true