material-components_material-components-ios/components/Dialogs/examples/DialogsCustomShadowViewController.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 Foundation
import MaterialComponents

class CustomShadowViewController: UIViewController {

  let bodyLabel = UILabel()

  let dismissButton = MDCFlatButton()

  override func viewDidLoad() {

    super.viewDidLoad()
    view.backgroundColor = UIColor.white
    view.layer.cornerRadius = 32.0

    bodyLabel.text =
      "This presented view has a corner radius so we've set the corner radius on the presentation controller."
    bodyLabel.translatesAutoresizingMaskIntoConstraints = false
    bodyLabel.numberOfLines = 0
    bodyLabel.sizeToFit()
    self.view.addSubview(bodyLabel)

    NSLayoutConstraint.activate(
      NSLayoutConstraint.constraints(withVisualFormat: "H:|-[body]-|", options: [], metrics: nil, views: [ "body": bodyLabel]))
    NSLayoutConstraint.activate(
      NSLayoutConstraint.constraints(withVisualFormat: "V:|-[body]-|", options: [], metrics: nil, views: [ "body": bodyLabel]))
  }

  override var preferredContentSize: CGSize {
    get {
      return CGSize(width:200.0, height:140.0);
    }
    set {
      super.preferredContentSize = newValue
    }
  }

}

class DialogsCustomShadowViewController: UIViewController {

  let flatButton = MDCFlatButton()
  let transitionController = MDCDialogTransitionController()

  override func viewDidLoad() {
    super.viewDidLoad()

    view.backgroundColor = UIColor.white

    flatButton.setTitle("PRESENT ALERT", for: UIControlState())
    flatButton.setTitleColor(UIColor(white: 0.1, alpha:1), for: UIControlState())
    flatButton.sizeToFit()
    flatButton.translatesAutoresizingMaskIntoConstraints = false
    flatButton.addTarget(self, action: #selector(tap), for: .touchUpInside)
    self.view.addSubview(flatButton)

    NSLayoutConstraint.activate([
      NSLayoutConstraint(item:flatButton,
                       attribute:.centerX,
                       relatedBy:.equal,
                       toItem:self.view,
                       attribute:.centerX,
                       multiplier:1.0,
                       constant: 0.0),
      NSLayoutConstraint(item:flatButton,
                       attribute:.centerY,
                       relatedBy:.equal,
                       toItem:self.view,
                       attribute:.centerY,
                       multiplier:1.0,
                       constant: 0.0)
    ])
  }

  @objc func tap(_ sender: Any) {
    let presentedController = CustomShadowViewController(nibName: nil, bundle: nil)
    presentedController.modalPresentationStyle = .custom;
    presentedController.transitioningDelegate = self.transitionController;

    self.present(presentedController, animated: true, completion: nil)

    // We set the corner radius to adjust the shadow that is implemented via the trackingView in the
    // presentation controller.
    if let presentationController = presentedController.mdc_dialogPresentationController {
      presentationController.dialogCornerRadius = presentedController.view.layer.cornerRadius
    }
  }

  // MARK: Catalog by convention
  @objc class func catalogBreadcrumbs() -> [String] {
    return [ "Dialogs", "View with Corner Radius"]
  }

  @objc class func catalogIsPrimaryDemo() -> Bool {
    return false
  }

  @objc class func catalogIsPresentable() -> Bool {
    return false
  }
}