print view hierarchy in Swift

ViewHierarchy.swift

func printAllSubviews(of view: UIView, from layer: Int) {
    for _ in 0..<layer {
        print(" ", separator: "", terminator: "")
    }
    print("\(view): ")
    let subView = view.subviews
    if subView.count != 0 {
        subView.forEach({ (view) in
            printAllSubviews(of: view, from: layer + 1)
        })
    }
}


let view1 = UIView()
let view2 = UIView()
view1.addSubview(view2)
let views = [UIView(), UIView(), UIView()]
views.count
views.forEach { (view) in
    view2.addSubview(view)
}
view2.subviews.count
let view = view2.subviews[1]
view.addSubview(UIView())
view.subviews

printAllSubviews(of: view1, from: 0)