Layout is a really small library to make it easy for you to create Auto Layout constraints in your apps. It's built on top of NSLayoutAnchor, and it includes all the type safety that comes with it. It also uses custom operators and Swift closures to make creating constraints as easy as possible:

let superview = UIView()
let subview = UIView()
superview.addSubview(subview)

// Method 1: Custom Operators
subview.layout {
  $0.top == superview.top + 16
  $0.centerX >= superview.centerX
  $0.width <= 50
  // and so on
}

// Method 2: Functions
subview.layout {
  $0.top.equals(superview.top, constant: 16)
  $0.centerX.greaterThanOrEqualTo(superView.centerX)
  $0.width.lessThanOrEqualTo(50)
  $0.height.equals(superview.height, priority: .defaultLow) // the functions let you express priority
  // and so on
}

// Helper Functions
subview.layout {
  // this will automatically negate the values for bottom and trailing
  $0.pinToEdges(superview, edgeInsets: .all(8))
}

This library draws a lot from SnapKit in terms of what the finished API should look like, but it's much simpler under the hood: it's under 200 LOC. In addition, my goal is to add more convenience functions to make common groups of constraints easier to build.

To use the latest version (the master branch of this repo):

pod 'Layout', :git => 'https://github.com/pranjalsatija/Layout'

To use a specific release (check the releases tab on this repo to see them all):

pod 'Layout', :git => 'https://github.com/pranjalsatija/Layout', :tag => 'x.x.x'

You should also add the -ObjC linker flag to your project's build settings so the UIView extensions that Layout has can get properly linked. Otherwise, you'll get undefined selector errors.

• Multipliers
• Aspect Ratio Constraints
• More Convenience Functions?
• Tests

pranjalsatija, [email protected]

Layout is available under the MIT license. See the LICENSE file for more info.