Align 0.3

• With new addSubview(_:constraints:) method you define a view hierarchy and layout views at the same time. It encourages splitting layout code into logical blocks and prevents programmer errors (e.g. trying to add constraints to views not in view hierarchy).

• Remove standalone fillSuperview(..) and centerInSuperview() family of functions. There were multiple cons of having them (e.g. more terminology to learn, hard to document and explain, inconsistent with center and size manipulations, were not allowing to pin in a corner).

Now you can manipulate multiple edges at the same time instead:

view.addSubview(stack) {
    $0.edges.pinToSuperview() // pins the edges to fill the superview
    $0.edges.pinToSuperview(insets: Insets(10)) // with insets
    $0.edges.pinToSuperviewMargins() // or margins

    $0.edges(.left, .right).pinToSuperview() // fill along horizontal axis
    $0.centerY.alignWithSuperview() // center along vertical axis
}

This is a much simpler model which removes entire layer of standalone methods available on LayoutItems. Now you always select either an anchor or collections of anchors, then use their methods to add constraints. Much simpler.

• Make LayoutProxy's base public to enable adding custom extensions on top of it.