Как разделить view на 3 равные части в swift?

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let view1 = UIView()
let view2 = UIView()
let view3 = UIView()

view.addSubview(view1)
view.addSubview(view2)
view.addSubview(view3)

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let margin: CGFloat = 20

view1.translatesAutoresizingMaskIntoConstraints = false
view1.topAnchor.constraint(equalTo: view.topAnchor, constant: margin).isActive = true
view1.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 1/3, constant: -2*margin/3).isActive = true
view1.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: margin).isActive = true
view1.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -margin).isActive = true

view2.translatesAutoresizingMaskIntoConstraints = false
view2.topAnchor.constraint(equalTo: view1.bottomAnchor, constant: margin/3).isActive = true
view2.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 1/3, constant: -2*margin/3).isActive = true
view2.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: margin).isActive = true
view2.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -margin).isActive = true

view3.translatesAutoresizingMaskIntoConstraints = false
view3.topAnchor.constraint(equalTo: view2.bottomAnchor, constant: margin/3).isActive = true
view3.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 1/3, constant: -2*margin/3).isActive = true
view3.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: margin).isActive = true
view3.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -margin).isActive = true

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let margin: CGFloat = 20

// ...

view2.topAnchor.constraint(equalTo: view1.bottomAnchor, constant: margin/3)

// ...

view3.topAnchor.constraint(equalTo: view2.bottomAnchor, constant: margin/3)