components/Dialogs/examples/DialogsWithEmphasisButtonExampleViewController.swift

// Copyright 2019-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.MaterialButtons
import MaterialComponents.MaterialButtons_Theming
import MaterialComponents.MaterialContainerScheme
import MaterialComponents.MaterialDialogs
import MaterialComponents.MaterialDialogs_Theming

class DialogsWithEmphasisButtonExampleViewController: UIViewController {

  private let materialButton = MDCButton()
  var containerScheme = MDCContainerScheme()

  override func viewDidLoad() {
    super.viewDidLoad()

    view.backgroundColor = containerScheme.colorScheme.backgroundColor

    materialButton.translatesAutoresizingMaskIntoConstraints = false
    materialButton.setTitle("Material Alert With Emphasis Buttons", for: .normal)
    materialButton.sizeToFit()
    materialButton.addTarget(self, action: #selector(tapMaterial), for: .touchUpInside)
    materialButton.applyTextTheme(withScheme: containerScheme)
    self.view.addSubview(materialButton)

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

  @objc func tapMaterial(_ sender: Any) {
    let title = "Reset Settings?"
    let message = "This will reset your device to its default factory settings."
    let alertController = MDCAlertController(title: title, message: message)
    let mediumEmphasisAction = MDCAlertAction(title: "Cancel", emphasis: .medium, handler: nil)
    mediumEmphasisAction.accessibilityIdentifier = "Cancel"
    let highEmphasisAction = MDCAlertAction(title: "Accept", emphasis: .high, handler: nil)
    highEmphasisAction.accessibilityIdentifier = "Accept"

    alertController.addAction(mediumEmphasisAction)
    alertController.addAction(highEmphasisAction)

    alertController.applyTheme(withScheme: containerScheme)
    present(alertController, animated: true, completion: nil)
  }
}

extension DialogsWithEmphasisButtonExampleViewController {

  @objc class func catalogMetadata() -> [String: Any] {
    return [
      "breadcrumbs": ["Dialogs", "Dialog with Themed Emphasis Buttons"],
      "primaryDemo": false,
      "presentable": true,
    ]
  }
}