Update tableview row label from another tableview selected row in swift - ios

Question

I have stuck up with an issue where I have a UITableView with a label and button in each row when the button is clicked from a particular row it will navigate to the next view and it has UITableView with a country list, when selected the country it will popup to the previous view and I want to update the country name with selected row, Could someone guide me how to update it. Below is my code. TIA
FirstViewController.swift
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomTableCell
let dict = customData[indexPath.row] as? NSObject
cell.lblTitle.text = "Title"
// cell.lblSubTitle.text = ""
cell.selectedButton.tag = indexPath.row
cell.selectedButton.addTarget(self, action: #selector(buttonClick), for: .touchUpInside)
return cell
}
#objc func buttonClick(sender: UIButton){
let customCell = CountryViewController(nibName: nil, bundle: nil)
self.navigationController?.pushViewController(customCell, animated: true)
}
CountryViewController.swift
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CountryCell", for: indexPath) as! CountryTableCell
cell.lblTitle.text = CountryList[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let selectedCountry = CountryList[indexPath.row]
self.navigationController?.popViewController(animated: true)
}

Answer 1

You can use delegation pattern:
protocol SelectCountry {
func countrySelected(withName countryName: String)
}
in your FirstViewController.swift conform to that protocol
extension FirstViewController: SelectCountry {
func countrySelected(withName countryName: String) {
// Assign country name to your label here
}
in your CountryViewController.swift make a variable called delegate/anyName you want
var delegate: SelectCountry?
in your buttonClick method
customCell.delegate = self
in your CountryViewController in didSelectRowAt method
delegate?.countrySelected(withName: CountryList[indexPath.row])
your label will be updated with country name you selected in CountryViewController.
NOTE: Names are just placeholders here you can use your own names for protocol/methods

Answer 2

First Controller:
"CountrySelectionDelegate" confirm this delegate in your first controller
Next, Pass/Store your FirstViewController cell selection index.
Go to your Country Controller, Select country, Pass it through "func selectedCountry(country: String,index: Int) {}" , Update your custom Data/Array.
Lastly reload your Table view with updated Custom data.
class FirstViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,CountrySelectionDelegate {
#IBOutlet weak var yourFirstTable: UITableView!
var customData = [Details(title: "Title-1", country: ""),Details(title: "Title - 2", country: ""),]
override func viewDidLoad() {
super.viewDidLoad()
}
func selectedCountry(country: String,index: Int) {
self.customData[index].country = country
yourFirstTable.reloadData()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return customData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! DetailTableCell
let custInfo = customData[indexPath.row]
cell.yourTitleLabel.text = "Title: " + custInfo.title
cell.yourCountryLabel.text = (custInfo.country.count > 0 ? "Country: \(custInfo.country)" : "Country: ---")
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let nextVC = self.storyboard?.instantiateViewController(withIdentifier: "CountryViewController") as? CountryViewController
nextVC?.selectedIndex = indexPath.row
nextVC?.delegate = self
self.navigationController?.pushViewController(nextVC!, animated: true)
}
}
CountryViewController:
import UIKit
protocol CountrySelectionDelegate {
func selectedCountry(country: String, index:Int)
}
class CountryViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
#IBOutlet weak var countryTable: UITableView!
var selectedIndex: Int = 0
let countryList = ["India","USA","UK","Nepal","Bangladesh","Pakistan","Bhutan"]
weak var delegate: CountrySelectionDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return countryList.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CountryTableViewCell
cell.countryLabel.text = countryList[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
delegate?.selectedCountry(country: countryList[indexPath.row], index: selectedIndex)
self.navigationController?.popViewController(animated: true)
}
}