2017-04-11 UIStackView playground

Here's a nice way to play with a UIStackView. Copy and paste the following code into a playground, and next to the final line, click the screen icon to permanently show it. Then adjust the parameters of the playground where necessary.

    import UIKit

    var view = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))

    view.backgroundColor = UIColor.yellow

    let label1 = UILabel()
    label1.text = "label 1"

    let label2 = UILabel()
    label2.text = "label 2"

    let spacer1 = UIView()
    spacer1.backgroundColor = UIColor.green
    spacer1.translatesAutoresizingMaskIntoConstraints = false
    spacer1.widthAnchor.constraint(equalToConstant: 3).isActive = true

    let spacer2 = UIView()
    spacer2.backgroundColor = UIColor.gray

    let stackView = UIStackView(arrangedSubviews: [label1, spacer1, label2, spacer2])
    stackView.distribution = .fill
    stackView.axis = .horizontal
    stackView.translatesAutoresizingMaskIntoConstraints = false
    stackView.spacing = 20

    view.addSubview(stackView)

    stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    stackView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    stackView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

    view.layoutIfNeeded()
    view

The result should look something like this: