Align

The best way to create constraints in code.

• Semantic. Align APIs focus on your goals, not the math behind Auto Layout constraints.
• Powerful. Create multiple constraints with a single line of code.
• Type Safe. Makes it impossible to create invalid constraints, at compile time.
• Fluent. Concise and clear API that follows Swift API Design Guidelines.
• Simple. Stop worrying about translatesAutoresizingMaskIntoConstraints and constraints activation.

Example usage:

// Core API
view.anchors.top.equal(superview.top)
view.anchors.width.equal(view.anchors.height * 2)

// Semantic API
view.anchors.edges.pin(insets: 20) // Pins to superview
view.anchors.edges.pin(to: superview.safeAreaLayoutGuide, insets: 20)
view.anchors.width.clamp(to: 10...40)

And here’s something a bit more powerful:

view.anchors.edges.pin(insets: 20, alignment: .center)

Documentation

The documentation for Align is created using DocC and covers all of its APIs in a clear visual way. There is also a cheat sheet available that lists all of the available APIs.

Requirements

Why Align

Align strives for clarity and simplicity by following Swift API Design Guidelines. Although most of the APIs are compact, it is a non-goal to enable the most concise syntax possible.

Align is for someone who:

• Prefers fluent high-level APIs
• Doesn’t want to depend on big, complex libraries – Align has only ~330 lines of code
• Prefers to have as little extensions for native classes as possible – Align adds a single property: anchors
• Doesn’t overuse operator overloads, prefers fast compile times
• Likes NSLayoutAnchor but wishes it had simpler API which didn’t require manually activating constraints