Reassign TableView Cell Variable from another ViewController - ios

Question

I'm working on an App where you can track your reading Progress for Books. I have 3 ViewControllers. One is the HomeViewController, where I have a TableView which displays the book. Second is the AddBookController, where you can enter some data, press a Button and create a new row in the TableView. Third is the BookDetailViewController, which is showing when you click on the selected row. Here I am stuck. There is a button you press and the corresponding TableView Cell should update its page number.
Can I use Notification Center for this? There is no Segue from HomeViewController to BookDetailViewController.
HomeViewController
class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, SendingBookDataProtocol {
#IBOutlet weak var addBookButton: UIButton!
#IBOutlet var tableView: UITableView!
var items = [BookItem]()
override func viewDidLoad() {
super.viewDidLoad()
tableView?.delegate = self
tableView?.dataSource = self
let nib = UINib(nibName: "BookCell", bundle: nil)
tableView?.register(nib, forCellReuseIdentifier: "BookCell")
}
func sendDataToHomeController(bookEntry item:BookItem) {
items.append(item)
tableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
items.count
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let bookDetailVc = self.storyboard?.instantiateViewController(withIdentifier: "BookDetailView") as? BookDetailViewController
let item = items[indexPath.row]
let currentPageInt = Float(item.currentPage)!
let totalPagesInt = Float(item.totalPages)!
bookDetailVc?.lblName = item.title
bookDetailVc?.lblCurrentPage = item.currentPage
bookDetailVc?.lblTotalPages = item.totalPages
self.navigationController?.pushViewController(bookDetailVc!, animated: true)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "BookCell", for: indexPath) as! BookCell
let item = items[indexPath.row]
cell.bookImage.image = item.image
cell.title.text = item.title
cell.author.text = item.author
cell.pageNumbers.text = "P. " + item.currentPage + " / " + item.totalPages
cell.title.text = item.title
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "getBookData" {
let addBookVC: AddBookController = segue.destination as! AddBookController
addBookVC.delegate = self
}
}
}
BookDetailView
class BookDetailViewController: HomeViewController{
#IBOutlet weak var bookTitle: UILabel!
#IBOutlet weak var currentPageDetail: UILabel!
#IBOutlet weak var totalPagesDetail: UILabel!
var lblName = String()
var lblCurrentPage = String()
var lblTotalPages = String()
override func viewDidLoad() {
super.viewDidLoad()
bookTitle.text = lblName
currentPageDetail.text = lblCurrentPage
totalPagesDetail.text = lblTotalPages
}
}

Answer 1

your self.navigationController? is null?
try it
self.present(bookDetailVc!, animated: true)
I hope this helps you.