import WidgetKit
import SwiftUI
import Intents

struct Provider: IntentTimelineProvider {
  ...
  func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
      var entries: [SimpleEntry] = []

      // Generate a timeline consisting of five entries an hour apart, starting from the current date.
      let currentDate = Date()
      for hourOffset in 0 ..< 5 {
          let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
          let entry = SimpleEntry(date: entryDate, randomNumber: Int.random(in: 1 ... 10), configuration: configuration)
          entries.append(entry)
      }

      let timeline = Timeline(entries: entries, policy: .atEnd)
      completion(timeline)
  }
  ...
}

struct SimpleEntry: TimelineEntry {
  let date: Date
  let randomNumber: Int
  let configuration: ConfigurationIntent
}

WidgetCenter.shared.reloadAllTimelines()

import UserNotifications
import WidgetKit

class NotificationService: UNNotificationServiceExtension {

    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    // プッシュ通知を受信したら、ココを通ります。
    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.contentHandler = contentHandler
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)

        if let bestAttemptContent = bestAttemptContent {
            // Modify the notification content here...
            bestAttemptContent.title = "\(bestAttemptContent.title) [modified]"

            contentHandler(bestAttemptContent)
        }
    }

    override func serviceExtensionTimeWillExpire() {
        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
            contentHandler(bestAttemptContent)
        }
    }
}

var note = new apn.Notification();
note.badge = 3;
note.sound = "ping.aiff";
note.alert = "プッシュ通知が届きましたよ！";
note.topic = "com.xxxx.WidgetSample";
note.mutableContent = 1 // ココで "mutable-content": 1 を指定しています。

@available(iOS 14.0, *)
extension NINearbyObject {

    public var distance: Float? { get }

    public var direction: simd_float3? { get }
}

@available(iOS 14.0, *)
open class NISession : NSObject {
  ....
  @NSCopying open var discoveryToken: NIDiscoveryToken? { get }
}

@available(iOS 14.0, *)
open class NIDiscoveryToken : NSObject, NSCopying, NSSecureCoding {
}

let session = NISession()
session.delegate = self

let token = session.discoveryToken
let encodedData = try? NSKeyedArchiver.archivedData(withRootObject: token, requiringSecureCoding: true)

private var mcSession: MCSession!

do {
    try mcSession.send(data, toPeers: mcSession.connectedPeers, with: .reliable)
} catch let error {
    NSLog("Error sending data: \(error)")
}

guard let discoveryToken = try? NSKeyedUnarchiver.unarchivedObject(ofClass: NIDiscoveryToken.self, from: data) else {
    fatalError("Unexpectedly failed to encode discovery token.")
}

let config = NINearbyPeerConfiguration(peerToken: discoveryToken)
session?.run(config)

@available(iOS 14.0, *)
public protocol NISessionDelegate : NSObjectProtocol {
  // This is called when new updates about nearby objects are available.
  optional func session(_ session: NISession, didUpdate nearbyObjects: [NINearbyObject])
  ...
}

@available(iOS 14.0, *)
public protocol NISessionDelegate : NSObjectProtocol {
  ...
  // This is called when the system is no longer attempting to interact with some nearby objects.
  optional func session(_ session: NISession, didRemove nearbyObjects: [NINearbyObject], reason: NINearbyObject.RemovalReason)
  ...
}

extension NINearbyObject {

    @available(iOS 14.0, *)
    public enum RemovalReason : Int {
        case timeout = 0
        case peerEnded = 1
    }
}

@available(iOS 14.0, *)
public protocol NISessionDelegate : NSObjectProtocol {
    ...
    // This is called when a session is suspended.
    optional func sessionWasSuspended(_ session: NISession)

    // This is called when a session may be resumed.
    optional func sessionSuspensionEnded(_ session: NISession)
    ...
}

func sessionSuspensionEnded(_ session: NISession) {
    if let config = self.session?.configuration {
        session.run(config)
    }
}

@available(iOS 14.0, *)
public protocol NISessionDelegate : NSObjectProtocol {
    ...
    // This is called when a session is invalidated.
    optional func session(_ session: NISession, didInvalidateWith error: Error)
}

func jpegData(compressionQuality: CGFloat) -> Data?

view.backgroundColor = UIColor(named: "mainBackgroundColor")

init(dynamicProvider: @escaping (UITraitCollection) -> UIColor)

extension UIColor {
  class var mainBackgroundColor: UIColor {
    return .init(dynamicProvider: { traitCollection -> UIColor in
      switch traitCollection.userInterfaceStyle {
      case .dark:
        return .black
      case .unspecified, .light:
        return .white
      @unknown default:
        return .white
      }
    })
  }
}

extension UIColor {
  class var mainBackgroundColor: UIColor {
    if #available(iOS 13.0, *) {
      return UIColor { traitCollection -> UIColor in
        switch traitCollection.userInterfaceStyle {
        case .dark:
          return .black
        case .unspecified, .light:
          return .white
        @unknown default:
          return .white
        }
      }
    } else {
      return .white
    }
  }
}

func connect(word1: String, word2: String) -> String {
  return text1 + text2
}

/// 引数に指定した2つのワードを連結した結果を返却します
///
/// - Parameters:
///   - word1: 1つ目のワード
///   - word2: 2つ目のワード
/// - Returns: 2つのワードを連結した結果
func connect(word1: String, word2: String) -> String {
  return text1 + text2
}

/// 引数に指定した2つのワードを連結した結果を返却します
///
/// - Parameters:
///   - word1: 1つ目のワード
///   - word2: 2つ目のワード
func connect(word1: String, word2: String) -> String {
  return text1 + text2
}

protocol sample {

  func connect(word1: String, word2: String)
}

protocol sample {

  /// <#Description#>
  /// - Parameters:
  ///   - word1: <#word1 description#>
  ///   - word2: <#word2 description#>
  /// - Returns: <#description#>
  func connect(word1: String, word2: String)
}

// Xcode11以降の挿入されるドキュメントコメント

/// <#Description#>
/// - Parameters:
///   - word1: <#word1 description#>
///   - word2: <#word2 description#>
/// - Returns: <#description#>

// Xcode10.xで挿入されていたドキュメントコメント

/// <#Description#>
///
/// - Parameters:
///   - word1: <#word1 description#>
///   - word2: <#word2 description#>
/// - Returns: <#description#>

// ContentView.swift
import SwiftUI

struct ContentView: View {
    var body: some View {
        Text("Hello, World!")
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

struct ContentView: View {
    var body: some View {
        Text("hoge")
        Text("fuga")
    }
}

struct ContentView: View {
    var body: some View {
        VStack {
          Text("hoge")
          Text("fuga")
        }
    }
}

// こんな感じで省略表記は可能です。
Text("Hello, World!")
    .font(.largeTitle)
    .fontWeight(.heavy)
    .foregroundColor(.blue)
    .padding(.all, 20.0)
    .background(.black)

struct ContentView: View {
    /// アラートの表示フラグ
    @State private var isShown = true

    var body: some View {
        VStack(spacing: 20.0) {
            Text("Hello, World!")
            Button(action: {
                // ボタンをタップすると、表示に切り替え
                self.isShown = true
            }) {
                Text("Button")
            }
            // isPresentedがtrueになった場合にアラートを表示する
            .alert(isPresented: $isShown) {
                Alert(title: Text("Tapped Button"))
            }
        }
    }
}

// main.page.swift
import ScadeKit

class MainPageAdapter: SCDLatticePageAdapter {

  // page adapter initialization
  override func load(_ path: String) {        
      super.load(path)

    // ①
      let button1 = self.page!.getWidgetByName("button1") as! SCDWidgetsButton

    // ②
      button1.onClick.append(SCDWidgetsEventHandler{ _ in
      // ③
          let label =  self.page!.getWidgetByName("label1") as! SCDWidgetsLabel
          label.text = "Swift on Android rocks"
      })
  }
}

var locationManager = CLLocationManager()

locationManager.delegate = self

locationManager.requestAlwaysAuthorization()

import UIKit
import CoreLocation

class ViewController: UIViewController {
  // MARK: - Properties
  var locationManager = CLLocationManager()

  // MARK: - Lifecycle
  override func viewDidLoad() {
    super.viewDidLoad()

    configureLocationManager()
  }

  // MARK: - Configure
  private func configureLocationManager() {
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
    locationManager.activityType = CLActivityType.fitness
    locationManager.pausesLocationUpdatesAutomatically = false
  }

  // MARK: - IBActions
  @IBAction private func didTapRequestAlwaysAuthorizationButton(_ sender: Any) {
    locationManager.requestAlwaysAuthorization()
  }

  @IBAction private func didTapRequestWhenInUseAuthorizationButton(_ sender: Any) {
    locationManager.requestWhenInUseAuthorization()
  }

  @IBAction private func didTapStartUpdatingLocationButton(_ sender: Any) {
    locationManager.startUpdatingLocation()
  }

  @IBAction private func didTapStopUpdatingLocationButton(_ sender: Any) {
    locationManager.stopUpdatingLocation()
  }

  @IBAction private func didTapStartUpdatingLocationAllowsBackgroundButton(_ sender: Any) {
    locationManager.allowsBackgroundLocationUpdates = true
    locationManager.startUpdatingLocation()
  }

  @IBAction private func didTapStopUpdatingLocationAllowsBackgroundButton(_ sender: Any) {
    locationManager.allowsBackgroundLocationUpdates = false
    locationManager.stopUpdatingLocation()
  }
}

// MARK: - CLLocationManagerDelegate
extension ViewController: CLLocationManagerDelegate {

  func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    switch status {
    case .notDetermined:
      print("未決定の場合")
    case .authorizedAlways:
      print("常に許可した場合")
    case .authorizedWhenInUse:
      print("使用中のみ許可した場合")
    case .denied:
      print("許可しない場合")
    case .restricted:
      print("位置情報を利用できない制限がある場合")
    @unknown default:
      fatalError("CLAuthorizationStatusの種類が増えているので、条件を見直す必要があります。")
    }
  }

  func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    guard let location = locations.first else { return }
    print("location: \(location.coordinate)")
  }
}

// 使用中のみ許可を求める
locationManager.requestWhenInUseAuthorization()

// 位置情報の取得を開始する
locationManager.startUpdatingLocation()

// 使用中のみ許可を求める
locationManager.requestWhenInUseAuthorization()

// Backgroundでの位置情報の更新を許可する
locationManager.allowsBackgroundLocationUpdates = true
// 位置情報の取得を開始する
locationManager.startUpdatingLocation()

// AppDelegate.swift
class AppDelegate: UIResponder, UIApplicationDelegate {

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    let center = UNUserNotificationCenter.current()
    center.delegate = self

    // 通知の許可を求める
    center.requestAuthorization(options: [.sound, .alert, .badge]) { (result, error) in
      print(result)
    }
    return true
  }

  ...

}

// MARK: - UNUserNotificationCenterDelegate
extension AppDelegate: UNUserNotificationCenterDelegate {

  // 未起動 or Background起動時にローカルプッシュを受信した場合
  func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    completionHandler()
  }

  // Foreground起動時にローカルプッシュを受信した場合
  func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    completionHandler(.alert)
  }
}

// ViewController.swift
class ViewController: UIViewController {
    ...
    private func configureLocationNotificationTrigger() {
        let content = UNMutableNotificationContent()
        content.title = "お知らせ！"
        content.body = "今、アプリを利用するとお得な情報をGETできます！"
        content.sound = UNNotificationSound.default

        let center = CLLocationCoordinate2D(latitude: 35.0, longitude: 139.7)
        let region = CLCircularRegion(center: center, radius: 200, identifier: "特定の場所")
        region.notifyOnEntry = true
        region.notifyOnExit = true
        let trigger = UNLocationNotificationTrigger(region: region, repeats: true)
        let request = UNNotificationRequest(identifier: "ジオフェンス", content: content, trigger: trigger)
        let notificationCenter = UNUserNotificationCenter.current()
        notificationCenter.add(request)
    }
}

// MARK: - CLLocationManagerDelegate
extension ViewController: CLLocationManagerDelegate {

  func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    switch status {
    case .notDetermined:
      print("未決定の場合")
    case .authorizedAlways:
      print("常に許可した場合")
    case .authorizedWhenInUse:
      print("使用中のみ許可した場合")
      configureLocationNotificationTrigger()
    case .denied:
      print("許可しない場合")
    case .restricted:
      print("位置情報を利用できない制限がある場合")
    @unknown default:
      fatalError("CLAuthorizationStatusの種類が増えているので、条件を見直す必要があります。")
    }
  }
  ...
}

# Podfile
use_frameworks!
platform :ios, '13.0'

target "HogeHogeSample" do
  # Normal libraries
  pod 'Moya'
  pod 'ReSwift'
  pod 'ReSwiftThunk'
  pod 'PromiseKit'

  abstract_target 'Tests' do
    target "HogeHogeSampleTests"
    target "HogeHogeSampleUITests"
  end
end

// Input File Listsに指定されたファイルの中身
${PODS_ROOT}/Target Support Files/Pods-HogeHogeSample/Pods-HogeHogeSample-frameworks.sh
${BUILT_PRODUCTS_DIR}/Alamofire/Alamofire.framework
${BUILT_PRODUCTS_DIR}/Moya/Moya.framework
${BUILT_PRODUCTS_DIR}/PromiseKit/PromiseKit.framework
${BUILT_PRODUCTS_DIR}/ReSwift/ReSwift.framework
${BUILT_PRODUCTS_DIR}/ReSwiftThunk/ReSwiftThunk.framework
${BUILT_PRODUCTS_DIR}/Result/Result.framework

// Output File Listsに指定されたファイルの中身
${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Alamofire.framework
${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Moya.framework
${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/PromiseKit.framework
${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/ReSwift.framework
${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/ReSwiftThunk.framework
${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Result.framework

// ViewController.swift
import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func saveImage(_ sender: Any) {
        let image = UIImage(named: "test1")
        if let data = image?.pngData() {
            let keyName = "test\(Int.random(in: 1 ... 100))"
            print("\(data) , keyName: \(keyName)")
            UserDefaults.standard.set(data, forKey: keyName)
            UserDefaults.standard.synchronize()
        }
    }
}

350129 bytes , keyName: test59
350129 bytes , keyName: test50
350129 bytes , keyName: test51
350129 bytes , keyName: test7
350129 bytes , keyName: test58
350129 bytes , keyName: test7
350129 bytes , keyName: test91
350129 bytes , keyName: test83
350129 bytes , keyName: test54
350129 bytes , keyName: test90
350129 bytes , keyName: test80
350129 bytes , keyName: test71
350129 bytes , keyName: test25
2019-10-19 16:47:19.645111+0900 AppSample[1048:193781] [User Defaults] CFPrefsPlistSource<0x2821a5600> (Domain: com.xxx.AppSample, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: Yes): Attempting to store >= 4194304 bytes of data in CFPreferences/NSUserDefaults on this platform is invalid. This is a bug in NotificationSample or a library it uses
2019-10-19 16:47:19.645273+0900 AppSample[1048:193781] [User Defaults] CFPrefsPlistSource<0x2821a5600> (Domain: com.xxx.AppSample, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: No): Transitioning into direct mode
350129 bytes , keyName: test21
350129 bytes , keyName: test32

import UIKit
import AuthenticationServices

class LoginViewController: UIViewController {
    ...
}

class LoginViewController: UIViewController {

    /// Sign In with Appleボタンを追加するためのUIStackView
    @IBOutlet weak var loginProviderStackView: UIStackView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Sign In with Appleボタンを配置します
        setupProviderLoginView()
    }

    ...

    /// Sign In with Appleのボタンを配置
    func setupProviderLoginView() {
        let authorizationButton = ASAuthorizationAppleIDButton()
        authorizationButton.addTarget(self, action: #selector(handleAuthorizationAppleIDButtonPress), for: .touchUpInside)
        self.loginProviderStackView.addArrangedSubview(authorizationButton)
    }

    ...

    /// Sign In with Appleボタンタップ後のアクション
    @objc
    func handleAuthorizationAppleIDButtonPress() {
        let appleIDProvider = ASAuthorizationAppleIDProvider()
        let request = appleIDProvider.createRequest()
        request.requestedScopes = [.fullName, .email]

        let authorizationController = ASAuthorizationController(authorizationRequests: [request])
        authorizationController.delegate = self
        authorizationController.presentationContextProvider = self
        authorizationController.performRequests()
    }
}

extension LoginViewController: ASAuthorizationControllerDelegate {
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
        ...
    }
}

extension LoginViewController: ASAuthorizationControllerPresentationContextProviding {
    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
        return self.view.window!
    }
}

import UIKit
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        // ① プッシュ通知の利用許可のリクエスト送信
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
            guard granted else { return }

            DispatchQueue.main.async {
                // ② プッシュ通知利用の登録
                UIApplication.shared.registerForRemoteNotifications()
            }
        }

        return true
    }
    ...
}

extension AppDelegate {

    // ③ プッシュ通知の利用登録が成功した場合
    func application(_ application: UIApplication,
                     didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let token = deviceToken.map { String(format: "%.2hhx", $0) }.joined()
        print("Device token: \(token)")
    }

    // ④ プッシュ通知の利用登録が失敗した場合
    func application(_ application: UIApplication,
                     didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Failed to register to APNs: \(error)")
    }
}

NSString *token = [[[[deviceToken description] stringByReplacingOccurrencesOfString:@"<"withString:@""]
                   stringByReplacingOccurrencesOfString:@">" withString:@""]
                   stringByReplacingOccurrencesOfString: @" " withString: @""];

let token = deviceToken.map { String(format: "%.2hhx", $0) }.joined()

{ length = 32, bytes = 7097978d 1e438923 ... 6fdbf111 }

// ↓ dataにDelegateメソッドに渡ってきたdeviceTokenを渡します
(NSString *)hexadecimalStringFromData:(NSData *)data
{
    NSUInteger dataLength = data.length;
    if (dataLength == 0) {
        return nil;
    }

    const unsigned char *dataBuffer = data.bytes;
    NSMutableString *hexString  = [NSMutableString stringWithCapacity:(dataLength * 2)];
    for (int i = 0; i < dataLength; ++i) {
        [hexString appendFormat:@"%02x", dataBuffer[i]];
    }
    return [hexString copy];
}

// deprecated対象
UIApplication.setMinimumBackgroundFetchInterval(_:)
UIApplicationDelegate.application(_:performFetchWithCompletionHandler:)

// AppDelegate.swift
import UIKit
import BackgroundTasks

// AppDelegate.swift
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    ...
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        // 第一引数: Info.plistで定義したIdentifierを指定
        // 第二引数: タスクを実行するキューを指定。nilの場合は、デフォルトのバックグラウンドキューが利用されます。
        // 第三引数: 実行する処理
        BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.MeasurementSample.refresh", using: nil) { task in
            // バックグラウンド処理したい内容 ※後述します
            self.handleAppProcessing(task: task as! BGProcessingTask)
        }
        return true
  }
}

private func scheduleAppProcessing() {
    // Info.plistで定義したIdentifierを指定
    let request = BGProcessingTaskRequest(identifier: "com.MeasurementSample.refresh")
    // 通信が発生するか否かを指定
    request.requiresNetworkConnectivity = false
    // CPU監視の必要可否を設定
    request.requiresExternalPower = true

    do {
        // スケジューラーに実行リクエストを登録
        try BGTaskScheduler.shared.submit(request)
    } catch {
        print("Could not schedule app processing: \(error)")
    }
}

func applicationDidEnterBackground(_ application: UIApplication) {
    // バックグラウンド起動に移ったときにルケジューリング登録
    scheduleAppProcessing()
}

// AppDelegate.swift
// サンプル用のOperation
class PrintOperation: Operation {
    let id: Int

    init(id: Int) {
        self.id = id
    }

    override func main() {
        print("this operation id is \(self.id)")
    }
}

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
  ...
  private func handleAppProcessing(task: BGProcessingTask) {
      // 1日の間、何度も実行したい場合は、1回実行するごとに新たにスケジューリングに登録します
      scheduleAppRefresh()

      let queue = OperationQueue()
      queue.maxConcurrentOperationCount = 1

      // 時間内に実行完了しなかった場合は、処理を解放します
      // バックグラウンドで実行する処理は、次回に回しても問題ない処理のはずなので、これでOK
      task.expirationHandler = {
          queue.cancelAllOperations()
      }

      // サンプルの処理をキューに詰めます
      let array = [1, 2, 3, 4, 5]
      array.enumerated().forEach { arg in
          let (offset, value) = arg
          let operation = PrintOperation(id: value)
          if offset == array.count - 1 {
              operation.completionBlock = {
                  // 最後の処理が完了したら、必ず完了したことを伝える必要があります
                  task.setTaskCompleted(success: operation.isFinished)
              }
          }
          queue.addOperation(operation)
      }
  }
}

// AppDelegate.swift
import UIKit
import BackgroundTasks

// AppDelegate.swift
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    ...
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        // 第一引数: Info.plistで定義したIdentifierを指定
        // 第二引数: タスクを実行するキューを指定。nilの場合は、デフォルトのバックグラウンドキューが利用されます。
        // 第三引数: 実行する処理
        BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.MeasurementSample.refresh", using: nil) { task in
            // バックグラウンド処理したい内容 ※後述します
            self.handleAppRefresh(task: task as! BGAppRefreshTask)
        }
        return true
  }
}

private func scheduleAppRefresh() {
    // Info.plistで定義したIdentifierを指定
    let request = BGAppRefreshTaskRequest(identifier: "com.MeasurementSample.refresh")
    // 最低で、どの程度の期間を置いてから実行するか指定
    request.earliestBeginDate = Date(timeIntervalSinceNow: 15 * 60)

    do {
        // スケジューラーに実行リクエストを登録
        try BGTaskScheduler.shared.submit(request)
    } catch {
        print("Could not schedule app refresh: \(error)")
    }
}

func applicationDidEnterBackground(_ application: UIApplication) {
    // バックグラウンド起動に移ったときにルケジューリング登録
    scheduleAppRefresh()
}

// AppDelegate.swift
// サンプル用のOperation
class PrintOperation: Operation {
    let id: Int

    init(id: Int) {
        self.id = id
    }

    override func main() {
        print("this operation id is \(self.id)")
    }
}

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
  ...
  private func handleAppRefresh(task: BGAppRefreshTask) {
      // 1日の間、何度も実行したい場合は、1回実行するごとに新たにスケジューリングに登録します
      scheduleAppRefresh()

      let queue = OperationQueue()
      queue.maxConcurrentOperationCount = 1

      // 時間内に実行完了しなかった場合は、処理を解放します
      // バックグラウンドで実行する処理は、次回に回しても問題ない処理のはずなので、これでOK
      task.expirationHandler = {
          queue.cancelAllOperations()
      }

      // サンプルの処理をキューに詰めます
      let array = [1, 2, 3, 4, 5]
      array.enumerated().forEach { arg in
          let (offset, value) = arg
          let operation = PrintOperation(id: value)
          if offset == array.count - 1 {
              operation.completionBlock = {
                  // 最後の処理が完了したら、必ず完了したことを伝える必要があります
                  task.setTaskCompleted(success: operation.isFinished)
              }
          }
          queue.addOperation(operation)
      }
  }
}

// Background Processing Tasksの場合
e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWithIdentifier:@"com.MeasurementSample.process"]

// Background App Refresh Tasksの場合
e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWithIdentifier:@"com.MeasurementSample.refresh"]

// Background Processing Tasksの場合
e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateExpirationForTaskWithIdentifier:@"com.MeasurementSample.process"]

// Background App Refresh Tasksの場合
e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateExpirationForTaskWithIdentifier:@"com.MeasurementSample.refresh"]

BGTaskSchedulerErrorDomain Code=1 "(null)"

(lldb) expression --object-description -- engineer

(lldb) po engineer

struct iOSEngineer {
  var name: string
  var age: Int
  var specialty: [String]
  var swiftLevel: Int
  var obcLevel: Int
}

let engineer = iOSEngineer(name: "Ichiro", age: 33, specialty: ["gps", "bluetooth", "animation"], swiftLevel: 3, obcLevel: 2)

(lldb) po engineer
▿ iOSEngineer
  - name : "Ichiro"
  - age : 33
  ▿ specialty : 3 elements
    - 0 : "gps"
    - 1 : "bluetooth"
    - 2 : "animation"
  - swiftLevel : 3
  - obcLevel : 2

(lldb) p engineer
(Sample.iOSEngineer) $R4 = {
  name = "Ichiro"
  age = 33
  specialty = 3 values {
    [0] = "gps"
    [1] = "bluetooth"
    [2] = "animation"
  }
  swiftLevel = 3
  obcLevel = 2
}

(lldb) p $R4.name
(String) $R10 = "Ichiro"

(lldb) po $R4.name
"Ichiro"

(lldb) expression -- engineer
(MeasurementSample.iOSEngineer) $R16 = {
  name = "Ichiro"
  age = 33
  specialty = 3 values {
    [0] = "gps"
    [1] = "bluetooth"
    [2] = "animation"
  }
  swiftLevel = 3
  obcLevel = 2
}

(lldb) v engineer
(MeasurementSample.iOSEngineer) engineer = {
  name = "Ichiro"
  age = 33
  specialty = 3 values {
    [0] = "gps"
    [1] = "bluetooth"
    [2] = "animation"
  }
  swiftLevel = 3
  obcLevel = 2
}

(lldb) frame variable engineer
(MeasurementSample.iOSEngineer) engineer = {
  name = "Ichiro"
  age = 33
  specialty = 3 values {
    [0] = "gps"
    [1] = "bluetooth"
    [2] = "animation"
  }
  swiftLevel = 3
  obcLevel = 2
}

protocol Engineer {
    var name: String { get set }
    var age: Int { get set }
    var specialty: [String] { get set }
}

struct iOSEngineer: Engineer {
    var name: String
    var age: Int
    var specialty: [String]
    var swiftLevel: Int
    var obcLevel:Int
}

let engineer: Engineer = iOSEngineer(name: "Ichiro", age: 33, specialty: ["gps", "bluetooth", "animation"], swiftLevel: 3, obcLevel: 2)

(lldb) p engineer.swiftLevel
error: <EXPR>:3:1: error: value of type 'Engineer' has no member 'swiftLevel'
engineer.swiftLevel
^~~~~~~~ ~~~~~~~~~~

(lldb) p (engineer as! iOSEngineer).swiftLevel
(Int) $R20 = 3

(lldb) v engineer.swiftLevel
(Int) engineer.swiftLevel = 3