SnapKit Sample

SnapKitSample.swift

import SnapKit
import UIKit

class ViewControllerLayout: UIView {
  lazy var square: UIView = {
    let view = UIView()
    view.backgroundColor = .red
    return view
  }()

  lazy var circle: UIView = {
    let view = UIView()
    view.backgroundColor = .blue.withAlphaComponent(0.9)
    view.layer.cornerRadius = 50
    view.layer.masksToBounds = true
    return view
  }()

  init() {
    super.init(frame: .zero)

    backgroundColor = .white

    addSubview(square)
    square.snp.makeConstraints {
      $0.leading.equalToSuperview().offset(50)
      $0.top.equalTo(layoutMarginsGuide.snp.topMargin).offset(100)
      $0.trailing.equalToSuperview().offset(-100)
      $0.height.equalTo(square.snp.width)
    }

    addSubview(circle)
    circle.snp.makeConstraints {
      $0.top.equalTo(layoutMarginsGuide.snp.topMargin).offset(50)
      $0.trailing.equalToSuperview().offset(-50)
      $0.width.equalTo(100)
      $0.height.equalTo(100)
    }
  }

  required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
}

class ViewController: UIViewController {
  lazy var layout = ViewControllerLayout()

  override func loadView() {
    view = layout
  }
}