"self.pushViewController" does not work in Swift4 - ios

Question

I would like to make a transition by placing a UITableView within the UINavigationController class and tapping the cell in it.
However, no matter how many times I press cell, it does not make a transition.
The code is the last one, "self.pushViewController (editViewController, animated: true)".
I am assuming navigationPush, but I would like you to tell me why it does not work.
I will ask for answers.
import UIKit
import APIKit
class BookListViewController: UINavigationController {
struct BookInfo {
let bookImage: UIImage?
let bookTitle: UILabel?
let bookPrice: UILabel?
let bookID: UILabel?
}
private lazy var navBar: UINavigationBar = {
let navBar = UINavigationBar()
navBar.frame = CGRect(x: 0, y: view.safeAreaInsets.top, width: view.frame.width, height: 44)
navBar.barTintColor = UIColor.white
let navItem = UINavigationItem()
let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(bookAdd))
navItem.rightBarButtonItem = addButton
navItem.title = "書籍一覧"
navBar.pushItem(navItem, animated: false)
return navBar
}()
private lazy var tableView: UITableView = {
let tableView = UITableView()
tableView.frame = CGRect(x: 0, y: navigationBar.frame.size.height + view.safeAreaInsets.top, width: view.frame.size.width, height: view.frame.size.height - view.safeAreaInsets.bottom)
tableView.rowHeight = 100
tableView.delegate = self
tableView.dataSource = self
tableView.register(BookListCell.self, forCellReuseIdentifier: NSStringFromClass(BookListCell.self))
return tableView
}()
private lazy var safeView: UIView = {
let safeView = UIView()
safeView.backgroundColor = UIColor.white
safeView.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.safeAreaInsets.top)
return safeView
}()
private lazy var loadButton: UIButton = {
let button = UIButton()
button.setTitle("読込", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont.systemFont(ofSize: 13)
button.backgroundColor = UIColor.blue
button.layer.cornerRadius = 25
button.addTarget(self, action: #selector(moreLoad(sender:)), for: .touchUpInside)
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
}
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
setupUI()
}
}
extension BookListViewController {
private func setupUI() {
view.addSubview(navBar)
view.addSubview(safeView)
view.addSubview(tableView)
view.addSubview(loadButton)
loadButton.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -20.0).isActive = true
loadButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -100.0).isActive = true
loadButton.widthAnchor.constraint(equalToConstant: 50.0).isActive = true
loadButton.heightAnchor.constraint(equalToConstant: 50.0).isActive = true
}
#objc func bookAdd() {
let bookAddViewController = BookAddViewController()
self.present(bookAddViewController, animated: true)
}
#objc func moreLoad(sender: UIButton) {
print("moreLoad!!")
}
}
extension BookListViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell: BookListCell = tableView.dequeueReusableCell(withIdentifier: NSStringFromClass(BookListCell.self), for: indexPath) as? BookListCell {
cell.bookimage.image = UIImage(named: "hoge")
cell.title.text = "書籍一覧"
cell.price.text = "200.000円"
cell.bookDay.text = "2018/12/31"
cell.editButton.setTitle(">", for: .normal)
return cell
}
let cell = UITableViewCell()
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
//個別の情報を載せて遷移
let editViewController = R.storyboard.main.edit()!
self.pushViewController(editViewController, animated: true)
}
}

Answer 1

In storyboard you need to add navigation controller which make this controller as rootviewcontroller. Just by dragging from navigation controller to your tableview controller.

Answer 2

You should extend BookListViewController from UIViewController and present this controller from another controller like this self.present(UINavigationController(rootViewController: BookListViewController()), animated: true) then you can access navigationItem easily with self.navigationItem inside BookListViewController.

Answer 3

self show current context when we use self.navigationController then we are actually telling push to perform that push on that current view's navigation controller
use:
self.navigationController.pushViewController(editViewController, animated: true)