SwiftyLayout

Swift helpers for UIKit Autolayout

SwiftyLayout is an easy way to work with UIKit's Autolayout in Swift.

A quick introduction

UIView and UILayoutGuide both conform to AutolayoutTarget. Constraints such as width or centering can be made between any two of these using the BinaryConstraint enum. Constraints on a single target, such as a fixed width or aspect ratio, can be made using the UnaryConstraint enum.

The appropriate functions in AutolayoutTarget+Constraints allow binary and unary constraints to be added to a target, for example:

viewOne.constrain(to: viewTwo, .centered, .width, .height(multiplier: 0.5))
viewOne.constrain(.squareAspectRatio)

There are helper functions to constrain to the view's superview, or the safe area, layout guide or readable layout guide of the superview:

viewOne.constrainToSuperviewSafeArea(.width)

Each function can set the resulting constraints' priority, and returns the created NSLayoutConstraint object(s) in an array:

let constraints: [NSLayoutConstraint] = viewOne.constrainToSuperview(priority: .defaultLow, .fill)