SwiftAutoLayout

SwiftAutoLayout is a UIView extension to easily create Auto Layout constraints. Auto Layout is a powerful tool, but it's often very verbose. This extension try to simplify some of the common uses of Auto Layout with some handy methods.

Initialization

There's a factory method to create a UIView with setTranslatesAutoresizingMaskIntoConstraints already set to false.

let myView = UIView.newAutoLayoutView()

Centering

With SwiftAutolayout it's easy to center a view in its superview.

myView.centerInSuperview()

Pin edges

With SwiftAutolayout it's easy to pin view edges to its superview.

myView.pinEdgesToSuperview()
myView.pinEdgesToSuperview(20)

Sizes

With SwiftAutolayout it's easy to create width and height constraints

let size = CGSize(10,10)
myView.constraintSize(size)

With SwiftAutolayout it's easy to match the width of a view to the width of another view?

myView.matchDimension(.Width, otherView: myOtherView)

The complete API

extension UIView {
	// MARK: Factory Methods
	class func newAutoLayoutView() -> UIView

	// MARK: Centering
	func centerInSuperview(autoAdd: Bool = true) -> [NSLayoutConstraint]
	func centerInSuperview(axis: NSLayoutAttribute, autoAdd: Bool = true) -> NSLayoutConstraint

	// MARK: Pin Edges to Superview
	func pinEdgesToSuperview(distance: CGFloat = 0, autoAdd: Bool = true) -> [NSLayoutConstraint]
	  
	// MARK: Same dimension
	func matchDimension(dimension: NSLayoutAttribute, toItem view: UIView, multiplier: CGFloat = 1, constant c: CGFloat = 0, autoAdd: Bool = true) -> NSLayoutConstraint
	func matchWidthWithHeight(multiplier: CGFloat = 1, constant c: CGFloat = 0, autoAdd: Bool = true) -> NSLayoutConstraint

	// MARK: Set size
	func constraintSize(size: CGSize, relatedBy relation: NSLayoutRelation = .Equal, autoAdd: Bool = true) -> [NSLayoutConstraint]
}

extension NSLayoutConstraint {
	convenience init(item view1: AnyObject, attribute attr: NSLayoutAttribute, relatedBy relation: NSLayoutRelation = .Equal, toItem view2: AnyObject?, multiplier: CGFloat = 1, constant c: CGFloat = 0)
	class func constraintsWithVisualFormat(format: String, metrics: [NSObject : AnyObject]?, views: [NSObject : AnyObject]) -> [AnyObject]
	class func constraintsWithVisualFormat(format: String, options opts: NSLayoutFormatOptions, views: [NSObject : AnyObject]) -> [AnyObject]
	class func constraintsWithVisualFormat(format: String, views: [NSObject : AnyObject]) -> [AnyObject]
}