SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.

import SnapKit

class MyViewController: UIViewController {

    lazy var box = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.addSubview(box)
        box.snp_makeConstraints { (make) -> Void in
           make.width.height.equalTo(50)
           make.center.equalTo(self.view)
        }
    }

}

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License

MIT license. See the LICENSE file for details.