components/Dialogs/examples/DialogsAccessoryExampleViewController.swift - external/github.com/material-components/material-components-ios - Git at Google

 // 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.MaterialCollections
 import MaterialComponents.MaterialDialogs
 import MaterialComponents.MaterialDialogs_Theming
 import MaterialComponents.MaterialTextControls_FilledTextFields
 import MaterialComponents.MaterialTextControls_FilledTextFieldsTheming
 import MaterialComponents.MaterialContainerScheme
 import MaterialComponents.MaterialTypographyScheme

 class DialogsAccessoryExampleViewController: MDCCollectionViewController {

   @objc lazy var containerScheme: MDCContainerScheming = {
     let scheme = MDCContainerScheme()
     scheme.colorScheme = MDCSemanticColorScheme(defaults: .material201907)
     scheme.typographyScheme = MDCTypographyScheme(defaults: .material201902)
     return scheme
   }()

   let kReusableIdentifierItem = "customCell"

   var menu: [String] = []

   var handler: MDCActionHandler = { action in
     print(action.title ?? "Some Action")
   }

   override func viewDidLoad() {
     super.viewDidLoad()

     view.backgroundColor = containerScheme.colorScheme.backgroundColor

     loadCollectionView(menu: [
       "Material Filled Text Field",
       "UI Text Field",
       "Confirmation Dialog",
       "Autolayout in Custom View",
     ])
   }

   func loadCollectionView(menu: [String]) {
     self.collectionView?.register(
       MDCCollectionViewTextCell.self, forCellWithReuseIdentifier: kReusableIdentifierItem)
     self.menu = menu
   }

   override func collectionView(
     _ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath
   ) {
     guard let alert = performActionFor(row: indexPath.row) else { return }
     self.present(alert, animated: true, completion: nil)
   }

   private func performActionFor(row: Int) -> MDCAlertController? {
     switch row {
     case 0:
       return performMDCTextField()
     case 1:
       return performUITextField()
     case 2:
       return performConfirmationDialog()
     case 3:
       return performCustomLabelWithButton()
     default:
       print("No row is selected")
       return nil
     }
   }

   // Demonstrate a custom view with MDCFilledTextField being assigned to the accessoryView API.
   // This example also demonstrates the use of autolayout in custom views.
   func performMDCTextField() -> MDCAlertController {
     let alert = MDCAlertController(title: "Rename File", message: nil)
     alert.addAction(MDCAlertAction(title: "Rename", emphasis: .medium, handler: handler))
     alert.addAction(MDCAlertAction(title: "Cancel", emphasis: .low, handler: handler))

     if let alertView = alert.view as? MDCAlertControllerView {
       alertView.contentInsets.bottom = 16.0
     }
     let view = UIView(frame: CGRect.zero)
     let label = newLabel(text: "OLD_FILE.PNG will be renamed:")

     let namefield = MDCFilledTextField()
     namefield.label.text = "New File Name"
     namefield.placeholder = "Enter a new file name"
     namefield.labelBehavior = MDCTextControlLabelBehavior.floats
     namefield.clearButtonMode = UITextField.ViewMode.whileEditing
     namefield.leadingAssistiveLabel.text = "An optional assistive message"
     namefield.applyTheme(withScheme: containerScheme)
     // Enable dynamic type.
     namefield.adjustsFontForContentSizeCategory = true
     namefield.font = UIFont.preferredFont(
       forTextStyle: .body, compatibleWith: namefield.traitCollection)
     namefield.leadingAssistiveLabel.font = UIFont.preferredFont(
       forTextStyle: .caption2, compatibleWith: namefield.traitCollection)

     label.translatesAutoresizingMaskIntoConstraints = false
     namefield.translatesAutoresizingMaskIntoConstraints = false
     view.translatesAutoresizingMaskIntoConstraints = true

     view.addSubview(label)
     view.addSubview(namefield)

     label.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
     label.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
     label.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
     label.bottomAnchor.constraint(equalTo: namefield.topAnchor, constant: -10).isActive = true

     namefield.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
     namefield.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
     namefield.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

     alert.accessoryView = view
     alert.mdc_adjustsFontForContentSizeCategory = true  // Enable dynamic type.
     alert.applyTheme(withScheme: self.containerScheme)
     return alert
   }

   func performUITextField() -> MDCAlertController {
     let alert = MDCAlertController(title: "This is a title", message: "This is a message")
     let textField = UITextField()
     textField.placeholder = "This is a text field"
     alert.accessoryView = textField
     alert.addAction(MDCAlertAction(title: "Dismiss", emphasis: .medium, handler: handler))
     alert.mdc_adjustsFontForContentSizeCategory = true  // Enable dynamic type.
     alert.applyTheme(withScheme: self.containerScheme)
     return alert
   }

   // Demonstrate a confirmation dialog with a custom table view.
   func performConfirmationDialog() -> MDCAlertController {
     let alert = MDCAlertController(title: "Phone ringtone", message: "Please select a ringtone:")
     alert.addAction(MDCAlertAction(title: "OK", handler: handler))
     alert.addAction(MDCAlertAction(title: "Cancel", handler: handler))

     alert.accessoryView = ExampleTableSeparatorView()

     if let alertView = alert.view as? MDCAlertControllerView {
       // Zero bottom-inset ensuring the bottom separator appears immediately above the actions.
       alertView.contentInsets.bottom = 0
       // Decreasing vertical margin between the accessory view and the message
       alertView.accessoryViewVerticalInset = 8
       // Aligning the accessory view with the dialog's edge by removing all horizontal insets.
       alertView.accessoryViewHorizontalInset = -alertView.contentInsets.left
     }

     alert.mdc_adjustsFontForContentSizeCategory = true  // Enable dynamic type.
     alert.applyTheme(withScheme: self.containerScheme)
     return alert
   }

   // Demonstrate a custom accessory view with auto layout, presenting a label and a button.
   func performCustomLabelWithButton() -> MDCAlertController {
     let alert = MDCAlertController(title: "Title", message: nil)
     alert.addAction(MDCAlertAction(title: "Dismiss", emphasis: .medium, handler: handler))

     let view = UIView(frame: CGRect.zero)
     let label = newLabel(text: "Your storage is full. Your storage is full.")
     let button = MDCButton()
     button.setTitle("Learn More", for: UIControl.State.normal)
     button.contentEdgeInsets = UIEdgeInsets(top: 8, left: 0, bottom: 0, right: 8)
     button.applyTextTheme(withScheme: containerScheme)

     label.translatesAutoresizingMaskIntoConstraints = false
     button.translatesAutoresizingMaskIntoConstraints = false
     view.translatesAutoresizingMaskIntoConstraints = true

     view.addSubview(label)
     view.addSubview(button)

     label.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
     label.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
     label.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
     label.bottomAnchor.constraint(equalTo: button.topAnchor).isActive = true

     button.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
     button.trailingAnchor.constraint(lessThanOrEqualTo: view.trailingAnchor).isActive = true
     button.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

     alert.accessoryView = view
     alert.mdc_adjustsFontForContentSizeCategory = true  // Enable dynamic type.
     alert.applyTheme(withScheme: self.containerScheme)

     return alert
   }

   func newLabel(text: String) -> UILabel {
     let label = UILabel()
     label.textColor = containerScheme.colorScheme.onSurfaceColor
     label.font = containerScheme.typographyScheme.subtitle2
     label.text = text
     label.numberOfLines = 0
     return label
   }

 }

 // MDCCollectionViewController Data Source
 extension DialogsAccessoryExampleViewController {

   override func numberOfSections(in collectionView: UICollectionView) -> Int {
     return 1
   }

   override func collectionView(
     _ collectionView: UICollectionView, numberOfItemsInSection section: Int
   ) -> Int {
     return menu.count
   }

   override func collectionView(
     _ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath
   ) -> UICollectionViewCell {

     let cell = collectionView.dequeueReusableCell(
       withReuseIdentifier: kReusableIdentifierItem,
       for: indexPath)
     guard let customCell = cell as? MDCCollectionViewTextCell else { return cell }

     customCell.isAccessibilityElement = true
     customCell.accessibilityTraits = .button

     let cellTitle = menu[indexPath.row]
     customCell.accessibilityLabel = cellTitle
     customCell.textLabel?.text = cellTitle

     return customCell
   }
 }

 // MARK: Catalog by convention
 extension DialogsAccessoryExampleViewController {

   @objc class func catalogMetadata() -> [String: Any] {
     return [
       "breadcrumbs": ["Dialogs", "Dialog With Accessory View"],
       "primaryDemo": false,
       "presentable": true,
     ]
   }
 }

 // MARK: Snapshot Testing by Convention
 extension DialogsAccessoryExampleViewController {

   func resetTests() {
     if presentedViewController != nil {
       dismiss(animated: false)
     }
   }

   @objc func testTextField() {
     resetTests()
     self.present(performUITextField(), animated: false, completion: nil)
   }

   @objc func testMDCTextField() {
     resetTests()
     self.present(performMDCTextField(), animated: false, completion: nil)
   }

   @objc func testCustomLabelWithButton() {
     resetTests()
     self.present(performCustomLabelWithButton(), animated: false, completion: nil)
   }

   @objc func testConfirmationDialog() {
     resetTests()
     self.present(performConfirmationDialog(), animated: false, completion: nil)
   }
 }

 // An example view with a tableview and a bottom separator.
 class ExampleTableSeparatorView: UIView, UITableViewDataSource {

   let ringtones = ["Callisto", "Luna", "Phobos", "Dione"]

   let tableView: UITableView = {
     let tv = AutoSizedTableView()
     tv.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
     tv.separatorStyle = .none
     tv.rowHeight = 40
     return tv
   }()

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

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

   func setup() {
     tableView.dataSource = self
     tableView.alwaysBounceVertical = false
     addSubview(tableView)

     let separator = UIView(frame: .zero)
     separator.backgroundColor = UIColor.lightGray.withAlphaComponent(0.5)
     addSubview(separator)

     tableView.translatesAutoresizingMaskIntoConstraints = false
     separator.translatesAutoresizingMaskIntoConstraints = false

     NSLayoutConstraint.activate([
       tableView.topAnchor.constraint(lessThanOrEqualTo: self.topAnchor),
       tableView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
       tableView.trailingAnchor.constraint(equalTo: self.trailingAnchor),
       separator.topAnchor.constraint(equalTo: tableView.bottomAnchor),
       separator.leadingAnchor.constraint(equalTo: self.leadingAnchor),
       separator.trailingAnchor.constraint(equalTo: self.trailingAnchor),
       separator.bottomAnchor.constraint(equalTo: self.bottomAnchor),
       separator.heightAnchor.constraint(equalToConstant: 2),
     ])

     tableView.reloadData()
     let currentRingtone = IndexPath(row: 1, section: 0)
     tableView.selectRow(at: currentRingtone, animated: false, scrollPosition: .top)
   }

   func numberOfSections(in tableView: UITableView) -> Int {
     return 1
   }

   func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
     return ringtones.count
   }

   func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
     let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
     cell.textLabel?.text = ringtones[indexPath.row]
     cell.indentationLevel = 1
     return cell
   }
 }

 // A tableview with intrinsic size that matches its content size.
 final class AutoSizedTableView: UITableView {
   override var contentSize: CGSize {
     didSet {
       invalidateIntrinsicContentSize()
     }
   }

   override var intrinsicContentSize: CGSize {
     layoutIfNeeded()
     return CGSize(width: UIView.noIntrinsicMetric, height: contentSize.height)
   }
 }
	// 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.MaterialCollections
	import MaterialComponents.MaterialDialogs
	import MaterialComponents.MaterialDialogs_Theming
	import MaterialComponents.MaterialTextControls_FilledTextFields
	import MaterialComponents.MaterialTextControls_FilledTextFieldsTheming
	import MaterialComponents.MaterialContainerScheme
	import MaterialComponents.MaterialTypographyScheme

	class DialogsAccessoryExampleViewController: MDCCollectionViewController {

	@objc lazy var containerScheme: MDCContainerScheming = {
	let scheme = MDCContainerScheme()
	scheme.colorScheme = MDCSemanticColorScheme(defaults: .material201907)
	scheme.typographyScheme = MDCTypographyScheme(defaults: .material201902)
	return scheme
	}()

	let kReusableIdentifierItem = "customCell"

	var menu: [String] = []

	var handler: MDCActionHandler = { action in
	print(action.title ?? "Some Action")
	}

	override func viewDidLoad() {
	super.viewDidLoad()

	view.backgroundColor = containerScheme.colorScheme.backgroundColor

	loadCollectionView(menu: [
	"Material Filled Text Field",
	"UI Text Field",
	"Confirmation Dialog",
	"Autolayout in Custom View",
	])
	}

	func loadCollectionView(menu: [String]) {
	self.collectionView?.register(
	MDCCollectionViewTextCell.self, forCellWithReuseIdentifier: kReusableIdentifierItem)
	self.menu = menu
	}

	override func collectionView(
	_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath
	) {
	guard let alert = performActionFor(row: indexPath.row) else { return }
	self.present(alert, animated: true, completion: nil)
	}

	private func performActionFor(row: Int) -> MDCAlertController? {
	switch row {
	case 0:
	return performMDCTextField()
	case 1:
	return performUITextField()
	case 2:
	return performConfirmationDialog()
	case 3:
	return performCustomLabelWithButton()
	default:
	print("No row is selected")
	return nil
	}
	}

	// Demonstrate a custom view with MDCFilledTextField being assigned to the accessoryView API.
	// This example also demonstrates the use of autolayout in custom views.
	func performMDCTextField() -> MDCAlertController {
	let alert = MDCAlertController(title: "Rename File", message: nil)
	alert.addAction(MDCAlertAction(title: "Rename", emphasis: .medium, handler: handler))
	alert.addAction(MDCAlertAction(title: "Cancel", emphasis: .low, handler: handler))

	if let alertView = alert.view as? MDCAlertControllerView {
	alertView.contentInsets.bottom = 16.0
	}
	let view = UIView(frame: CGRect.zero)
	let label = newLabel(text: "OLD_FILE.PNG will be renamed:")

	let namefield = MDCFilledTextField()
	namefield.label.text = "New File Name"
	namefield.placeholder = "Enter a new file name"
	namefield.labelBehavior = MDCTextControlLabelBehavior.floats
	namefield.clearButtonMode = UITextField.ViewMode.whileEditing
	namefield.leadingAssistiveLabel.text = "An optional assistive message"
	namefield.applyTheme(withScheme: containerScheme)
	// Enable dynamic type.
	namefield.adjustsFontForContentSizeCategory = true
	namefield.font = UIFont.preferredFont(
	forTextStyle: .body, compatibleWith: namefield.traitCollection)
	namefield.leadingAssistiveLabel.font = UIFont.preferredFont(
	forTextStyle: .caption2, compatibleWith: namefield.traitCollection)

	label.translatesAutoresizingMaskIntoConstraints = false
	namefield.translatesAutoresizingMaskIntoConstraints = false
	view.translatesAutoresizingMaskIntoConstraints = true

	view.addSubview(label)
	view.addSubview(namefield)

	label.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
	label.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
	label.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
	label.bottomAnchor.constraint(equalTo: namefield.topAnchor, constant: -10).isActive = true

	namefield.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
	namefield.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
	namefield.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

	alert.accessoryView = view
	alert.mdc_adjustsFontForContentSizeCategory = true // Enable dynamic type.
	alert.applyTheme(withScheme: self.containerScheme)
	return alert
	}

	func performUITextField() -> MDCAlertController {
	let alert = MDCAlertController(title: "This is a title", message: "This is a message")
	let textField = UITextField()
	textField.placeholder = "This is a text field"
	alert.accessoryView = textField
	alert.addAction(MDCAlertAction(title: "Dismiss", emphasis: .medium, handler: handler))
	alert.mdc_adjustsFontForContentSizeCategory = true // Enable dynamic type.
	alert.applyTheme(withScheme: self.containerScheme)
	return alert
	}

	// Demonstrate a confirmation dialog with a custom table view.
	func performConfirmationDialog() -> MDCAlertController {
	let alert = MDCAlertController(title: "Phone ringtone", message: "Please select a ringtone:")
	alert.addAction(MDCAlertAction(title: "OK", handler: handler))
	alert.addAction(MDCAlertAction(title: "Cancel", handler: handler))

	alert.accessoryView = ExampleTableSeparatorView()

	if let alertView = alert.view as? MDCAlertControllerView {
	// Zero bottom-inset ensuring the bottom separator appears immediately above the actions.
	alertView.contentInsets.bottom = 0
	// Decreasing vertical margin between the accessory view and the message
	alertView.accessoryViewVerticalInset = 8
	// Aligning the accessory view with the dialog's edge by removing all horizontal insets.
	alertView.accessoryViewHorizontalInset = -alertView.contentInsets.left
	}

	alert.mdc_adjustsFontForContentSizeCategory = true // Enable dynamic type.
	alert.applyTheme(withScheme: self.containerScheme)
	return alert
	}

	// Demonstrate a custom accessory view with auto layout, presenting a label and a button.
	func performCustomLabelWithButton() -> MDCAlertController {
	let alert = MDCAlertController(title: "Title", message: nil)
	alert.addAction(MDCAlertAction(title: "Dismiss", emphasis: .medium, handler: handler))

	let view = UIView(frame: CGRect.zero)
	let label = newLabel(text: "Your storage is full. Your storage is full.")
	let button = MDCButton()
	button.setTitle("Learn More", for: UIControl.State.normal)
	button.contentEdgeInsets = UIEdgeInsets(top: 8, left: 0, bottom: 0, right: 8)
	button.applyTextTheme(withScheme: containerScheme)

	label.translatesAutoresizingMaskIntoConstraints = false
	button.translatesAutoresizingMaskIntoConstraints = false
	view.translatesAutoresizingMaskIntoConstraints = true

	view.addSubview(label)
	view.addSubview(button)

	label.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
	label.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
	label.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
	label.bottomAnchor.constraint(equalTo: button.topAnchor).isActive = true

	button.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
	button.trailingAnchor.constraint(lessThanOrEqualTo: view.trailingAnchor).isActive = true
	button.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

	alert.accessoryView = view
	alert.mdc_adjustsFontForContentSizeCategory = true // Enable dynamic type.
	alert.applyTheme(withScheme: self.containerScheme)

	return alert
	}

	func newLabel(text: String) -> UILabel {
	let label = UILabel()
	label.textColor = containerScheme.colorScheme.onSurfaceColor
	label.font = containerScheme.typographyScheme.subtitle2
	label.text = text
	label.numberOfLines = 0
	return label
	}

	}

	// MDCCollectionViewController Data Source
	extension DialogsAccessoryExampleViewController {

	override func numberOfSections(in collectionView: UICollectionView) -> Int {
	return 1
	}

	override func collectionView(
	_ collectionView: UICollectionView, numberOfItemsInSection section: Int
	) -> Int {
	return menu.count
	}

	override func collectionView(
	_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath
	) -> UICollectionViewCell {

	let cell = collectionView.dequeueReusableCell(
	withReuseIdentifier: kReusableIdentifierItem,
	for: indexPath)
	guard let customCell = cell as? MDCCollectionViewTextCell else { return cell }

	customCell.isAccessibilityElement = true
	customCell.accessibilityTraits = .button

	let cellTitle = menu[indexPath.row]
	customCell.accessibilityLabel = cellTitle
	customCell.textLabel?.text = cellTitle

	return customCell
	}
	}

	// MARK: Catalog by convention
	extension DialogsAccessoryExampleViewController {

	@objc class func catalogMetadata() -> [String: Any] {
	return [
	"breadcrumbs": ["Dialogs", "Dialog With Accessory View"],
	"primaryDemo": false,
	"presentable": true,
	]
	}
	}

	// MARK: Snapshot Testing by Convention
	extension DialogsAccessoryExampleViewController {

	func resetTests() {
	if presentedViewController != nil {
	dismiss(animated: false)
	}
	}

	@objc func testTextField() {
	resetTests()
	self.present(performUITextField(), animated: false, completion: nil)
	}

	@objc func testMDCTextField() {
	resetTests()
	self.present(performMDCTextField(), animated: false, completion: nil)
	}

	@objc func testCustomLabelWithButton() {
	resetTests()
	self.present(performCustomLabelWithButton(), animated: false, completion: nil)
	}

	@objc func testConfirmationDialog() {
	resetTests()
	self.present(performConfirmationDialog(), animated: false, completion: nil)
	}
	}

	// An example view with a tableview and a bottom separator.
	class ExampleTableSeparatorView: UIView, UITableViewDataSource {

	let ringtones = ["Callisto", "Luna", "Phobos", "Dione"]

	let tableView: UITableView = {
	let tv = AutoSizedTableView()
	tv.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
	tv.separatorStyle = .none
	tv.rowHeight = 40
	return tv
	}()

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

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

	func setup() {
	tableView.dataSource = self
	tableView.alwaysBounceVertical = false
	addSubview(tableView)

	let separator = UIView(frame: .zero)
	separator.backgroundColor = UIColor.lightGray.withAlphaComponent(0.5)
	addSubview(separator)

	tableView.translatesAutoresizingMaskIntoConstraints = false
	separator.translatesAutoresizingMaskIntoConstraints = false

	NSLayoutConstraint.activate([
	tableView.topAnchor.constraint(lessThanOrEqualTo: self.topAnchor),
	tableView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
	tableView.trailingAnchor.constraint(equalTo: self.trailingAnchor),
	separator.topAnchor.constraint(equalTo: tableView.bottomAnchor),
	separator.leadingAnchor.constraint(equalTo: self.leadingAnchor),
	separator.trailingAnchor.constraint(equalTo: self.trailingAnchor),
	separator.bottomAnchor.constraint(equalTo: self.bottomAnchor),
	separator.heightAnchor.constraint(equalToConstant: 2),
	])

	tableView.reloadData()
	let currentRingtone = IndexPath(row: 1, section: 0)
	tableView.selectRow(at: currentRingtone, animated: false, scrollPosition: .top)
	}

	func numberOfSections(in tableView: UITableView) -> Int {
	return 1
	}

	func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
	return ringtones.count
	}

	func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
	let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
	cell.textLabel?.text = ringtones[indexPath.row]
	cell.indentationLevel = 1
	return cell
	}
	}

	// A tableview with intrinsic size that matches its content size.
	final class AutoSizedTableView: UITableView {
	override var contentSize: CGSize {
	didSet {
	invalidateIntrinsicContentSize()
	}
	}

	override var intrinsicContentSize: CGSize {
	layoutIfNeeded()
	return CGSize(width: UIView.noIntrinsicMetric, height: contentSize.height)
	}
	}