Swift - How go to another UITableViewCell from UITableViewCell?

Question

I have a UIViewController that instantiates some UITableViewCell according to the desired option on the screen. One of theses options is "instructions", and I created a .XIB file to show the instructions on the screen. But, on this screen, I have a button to show more instruction (in another screen). So, I created another .XIB file with the instructions and I need to go there from the first instructions screen. How can I do that?

This is my code:

import UIKit

class FirstInstructionsCell: UITableViewCell {

    @IBOutlet weak var showSecondInstructions: UIButton!

    var secondInstructionsView: SecondInstructions!

    static let FIRST_INSTRUCTIONS_CELL_IDENTIFIER = "FirstInstructionsCell"

    @IBAction func showSecondInstructionsTapped(_ sender: UIButton) {
        print("Here I need to go to SecondInstructions screen")
    }
}

After changes, my UIViewController:

import UIKit

class FirstInstructionsViewController: UIViewController, FirstInstructionsCellDelegate {
    func goSecondScreen() {
        presentViewController(SecondInstructions, animated: true, completion: nil) 
// Here I have an error: Cannot convert value of type 'SecondInstructions.Type' to expected argument type 'UIViewController'
// 'SecondInstructions' is a UITableViewCell
    }

    @IBOutlet weak var confirmButton: UIButton!

    @IBOutlet weak var tableView: UITableView!

    var withdrawalCode: Int!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.tableView.register(UINib(nibName: FirstInstructionsCell.FIRST_INSTRUCTIONS_CELL_IDENTIFIER, bundle: nil), forCellReuseIdentifier: FirstInstructionsCell.FIRST_INSTRUCTIONS_CELL_IDENTIFIER)

        self.tableView.rowHeight = UITableView.automaticDimension
        self.tableView.estimatedRowHeight = 470.0
    }


    //MARK: - Actions

    @IBAction func onConfirmClicked(_ sender: UIButton) {
        self.navigationController?.popViewController(animated: true)
    }

}

// MARK: - UITableViewDelegate
extension FirstInstructionsViewController: UITableViewDelegate {
    func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
        return 13.0
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 142.0
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        return PayPaxxHeaderView.loadFromNib(CGRect(x: 0, y: 0, width: self.view.bounds.width, height: 142.0)) as! PayPaxxHeaderView
    }
}

// MARK: - UITableViewDataSource
extension FirstInstructionsViewController: UITableViewDataSource {

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = self.tableView.dequeueReusableCell(withIdentifier: FirstInstructionsCell.FIRST_INSTRUCTIONS_CELL_IDENTIFIER, for: indexPath) as! FirstInstructionsCell
        cell.fillCell(self.withdrawalCode)
        cell.delegate = self
        return cell
    }
}

Answer 1

As far as I understood, you need to go to another screen. Why not use protocol for that?

import UIKit

protocol FirstInstructionsCellDelegate {
    func goToSecondScreen()
}

class FirstInstructionsCell: UITableViewCell {

    @IBOutlet weak var showSecondInstructions: UIButton!

    var secondInstructionsView: SecondInstructions!
    var delegate : FirstInstructionsCellDelegate?

    static let FIRST_INSTRUCTIONS_CELL_IDENTIFIER = "FirstInstructionsCell"

    @IBAction func showSecondInstructionsTapped(_ sender: UIButton) {
        print("Here I need to go to SecondInstructions screen")
        delegate?.goToSecondScreen()
    }
}

Then, in your cellForRow(at:indexPath:) you can say (after dequeueing):

cell.delegate = self

Your viewController needs to implement it:

class FirstInstructionViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, FirstInstructionsCellDelegate {

and then, in that View Controller, implement said function:

func goToSecondScreen() {
    let story = UIStoryboard(named: "SecondScreen", bundle: nil)
    let viewController = story.instantiateViewController(withIdentifier: "SecondScreen")
    self.navigationController?.pushViewController(viewController, animated: true)
    // or 
    self.present(viewController, animated: true, completion: nil)
}

NOTE:

you need to set storyboard identifier in interface builder.