Using anchors to match a parent view's constraints

Swift extensions are really great, including when working with Auto Layout. We can make a child view fill its superview using constraints, as well as having insets between them. This is very useful when adding a child view controller to its parent within a subview.

extension UIView {
    func attachAnchors(to view: UIView, with insets: UIEdgeInsets = .zero) {
        NSLayoutConstraint.activate([
            topAnchor.constraint(
                equalTo: view.topAnchor,
                constant: insets.top
            ),
            rightAnchor.constraint(
                equalTo: view.rightAnchor,
                constant: -insets.right
            ),
            bottomAnchor.constraint(
                equalTo: view.bottomAnchor,
                constant: -insets.bottom
            ),
            leftAnchor.constraint(
                equalTo: view.leftAnchor,
                constant: insets.left
            )
        ])
    }
}

I hope the article was useful. If you have any feedback or questions please feel free to reach out.

Thanks for reading!