Swift+Masonry

3.可用SnapKit代替Masonry

pod 'SnapKit', '~> 0.19.1'

0.20.0以后的会报错，没找到解决方法

import SnapKit

class ViewController: UIViewController {

override func viewDidLoad() {

super.viewDidLoad()

let view = UIView.init()

self.view.addSubview(view)

view.backgroundColor = UIColor.redColor()

view.snp_makeConstraints { make in

make.width.height.equalTo(50)

make.center.equalTo(self.view)

}

}

}