Visual Format Constraints

visualFormat.swift

private func setupVisualConstraints() {
    view.addSubview(titleLabel)
    view.addSubview(hiButton)

    let viewsDict = [
        "label": titleLabel,
        "button": hiButton
    ]

    let verticalConstraint = NSLayoutConstraint.constraints(
        withVisualFormat: "V:|-20-[label]-[button]",
        options: [],
        metrics: nil,
        views: viewsDict
    )

    let labelHorizontalConstraint = NSLayoutConstraint.constraints(
        withVisualFormat: "H:|-20-[label]-20-|",
        options: [],
        metrics: nil,
        views: viewsDict
    )

    let buttonHorizontalConstraint = NSLayoutConstraint.constraints(
        withVisualFormat: "H:|-20-[button]-20-|",
        options: [],
        metrics: nil,
        views: viewsDict
    )

    NSLayoutConstraint.activate(verticalConstraint)
    NSLayoutConstraint.activate(labelHorizontalConstraint)
    NSLayoutConstraint.activate(buttonHorizontalConstraint)
}