components/NavigationDrawer/examples/supplemental/BottomDrawerSupplemental.swift

// Copyright 2018-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import UIKit
import MaterialComponents.MaterialNavigationDrawer
import MaterialComponents.MaterialColorScheme

class DrawerContentViewController: UIViewController {
  var preferredHeight: CGFloat = 2000
  let bodyLabel: UILabel = {
    let label = UILabel(frame: .zero)
    label.text = "Example body"
    label.sizeToFit()
    return label
  }()

  override var preferredContentSize: CGSize {
    get {
      return CGSize(width: view.bounds.width, height: preferredHeight)
    }
    set {
      super.preferredContentSize = newValue
    }
  }

  init() {
    super.init(nibName: nil, bundle: nil)
  }

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
  }
  override func viewDidLoad() {
    super.viewDidLoad()
    view.addSubview(bodyLabel)
  }

  override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    bodyLabel.center =
      CGPoint(x: self.view.frame.size.width / 2, y: 20)
  }

}

class DrawerHeaderViewController: UIViewController, MDCBottomDrawerHeader {
  let preferredHeight: CGFloat = 80

  lazy var closeButton: UIButton = {
    let button = UIButton()
    button.setTitle("Close", for: .normal)
    button.addTarget(self, action: #selector(closeButtonTapped), for: .touchUpInside)
    button.setTitleColor(.black, for: .normal)
    return button
  }()

  let titleLabel: UILabel = {
    let label = UILabel(frame: .zero)
    label.text = "Example Header"
    label.accessibilityTraits = .header
    label.sizeToFit()
    return label
  }()

  override var preferredContentSize: CGSize {
    get {
      return CGSize(width: view.bounds.width, height: preferredHeight)
    }
    set {
      super.preferredContentSize = newValue
    }
  }

  override func viewDidLoad() {
    super.viewDidLoad()
    view.addSubview(closeButton)
    view.addSubview(titleLabel)
  }

  override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    closeButton.sizeToFit()
    closeButton.center = CGPoint(x: 30, y: self.preferredHeight - 20)
    titleLabel.center = CGPoint(x: self.view.frame.size.width / 2, y: self.preferredHeight - 20)
  }

  @objc
  func closeButtonTapped() {
    dismiss(animated: true)
  }
}