#if DEV
print("I'm Dev Target")
#else
print("I'm not Dev Target")
#endif

final class PracticeViewController: UIViewController {
    static func instance() -> PracticeViewController? {
        return PracticeViewController()
    }
}

func pushPraticeVC() {
  guard let viewController = PracticeViewController.instance() else { return }
  self.navigationController?.pushViewController(viewController, animated: true)
}

private let tableView: UITableView = {
   let tableView = UITableView(frame: .zero, style: .grouped)
   tableView.register(PracticeChatTableViewCell.self, forCellReuseIdentifier: PracticeChatTableViewCell.identifier)
   tableView.separatorStyle = .none
   tableView.rowHeight = UITableView.automaticDimension
   tableView.estimatedRowHeight = 150
   return tableView
}()

func initViews() {
    super.initViews()

    self.view.addSubview(self.tableView)
    self.tableView.make { (make) in
        make.edges.equalToSuperview()
    }

    self.tableView.delegate = self
    self.tableView.dataSource = self
}

import UIKit

class PracticeChatTableViewCell: UITableViewCell {
    static let identifier = "PracticeChatCell"

    private let containerView: UIView = {
        let containerView = UIView()
        containerView.backgroundColor = .red
        return containerView
    }()

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        self.contentView.addSubview(self.containerView)
        self.containerView.make { (make) in
            make.edges.equalToSuperview()
        }
    }

    required init?(coder: NSCoder) {
        fatalError("")
    }
}

import UIKit

final class PracticeViewController: UIViewController {
    static func instance() -> PracticeViewController? {
        return PracticeViewController()
    }

    private let tableView: UITableView = {
        let tableView = UITableView(frame: .zero, style: .grouped)
        tableView.register(PracticeChatTableViewCell.self, forCellReuseIdentifier: PracticeChatTableViewCell.identifier)
        tableView.separatorStyle = .none
        tableView.rowHeight = UITableView.automaticDimension
        tableView.estimatedRowHeight = 150
        return tableView
    }()

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

    func initViews() {
        super.initViews()

        self.view.addSubview(self.tableView)
        self.tableView.make { (make) in
            make.edges.equalToSuperview()
        }

        self.tableView.delegate = self
        self.tableView.dataSource = self
    }
}

extension PracticeViewController: UITableViewDelegate, UITableViewDataSource {
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: PracticeChatTableViewCell.identifier, for: indexPath)
        return cell
    }
}

// MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        window = UIWindow()
        window?.rootViewController = ViewController()
        window?.makeKeyAndVisible()

        return true
    }    
}

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        view.backgroundColor = .blue
    }
}

pod 'DZNEmptyDateSet'

class ViewController: UIViewController {
  func viewDidLoad() {
    self.viewDidLoad()

    self.tableView.emptyDataSetSource = self
    self.tableView.emptyDataSetDelegate = self
  }
}

// MARK: DZNEmptyDataSetDelegate
extension ViewController: DZNEmptyDataSetDelegate {
    // 스크롤 권한 요청 > default는 false
    func emptyDataSetShouldAllowScroll(_ scrollView: UIScrollView!) -> Bool {
        return true/false
    }
}

// MARK: DZNEmptyDataSetSource
extension ViewController: DZNEmptyDataSetSource {
    // 비어있는 상태의 이미지 설정
    func image(forEmptyDataSet scrollView: UIScrollView!) -> UIImage! {
        return
    }
    // 비어있는 상태의 제목 설정
    func title(forEmptyDataSet scrollView: UIScrollView!) -> NSAttributedString! {
        return
    }
}