tableview sent me an error when I tried to present a uiview in front of it - ios

Question

I'm new with Xcode and Swift, following a tutorial and I found a problem when I called a UIView in front of a tableview so the user can create something new
NOTE: I already tried what this link shows with no luck to resolve my issue
I am using Xcode 11.3.1 and Swift
This is my code
Channel Model
import Foundation
struct Channel : Decodable {
public private(set) var channelTitle: String!
public private(set) var channelDescription: String!
public private(set) var id: String!
}
Class ChannelCell
import UIKit
class ChannelCell: UITableViewCell {
// Outlets
#IBOutlet weak var channelName: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
if selected {
self.layer.backgroundColor = UIColor(white: 1, alpha: 0.2).cgColor
} else {
self.layer.backgroundColor = UIColor.clear.cgColor
}
}
func configureCell(channel: Channel) {
let title = channel.channelTitle ?? ""
channelName.text = "#\(title)"
}
}
Channel View Controller
import UIKit
class ChannelVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
// Outlets
#IBOutlet weak var loginBtn: UIButton!
#IBOutlet weak var userImg: CircleImage!
#IBOutlet weak var tableView: UITableView!
#IBAction func prepareForUnwind(segue: UIStoryboardSegue) {}
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self <<<<<<<<< here I get the error message ***
Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value
tableView.dataSource = self
self.revealViewController()?.rearViewRevealWidth = self.view.frame.size.width - 60
NotificationCenter.default.addObserver(self, selector: #selector(ChannelVC.userDataDidChange(_:)), name: NOTIF_USER_DATA_DID_CHANGE, object: nil)
}
override func viewDidAppear(_ animated: Bool) {
setupUserInfo()
}
When I pressed the add channel button comes the problem
#IBAction func addChannelPressed(_ sender: Any) {
if AuthService.instance.isLoggedIn {
let addChannel = ChannelVC()
addChannel.modalPresentationStyle = .custom
present(addChannel, animated: true, completion: nil)
} else {
performSegue(withIdentifier: TO_LOGIN, sender: nil)
}
}
#IBAction func loginBtnPressed(_ sender: Any) {
if AuthService.instance.isLoggedIn {
let profile = ProfileVC()
profile.modalPresentationStyle = .custom
present(profile, animated: true, completion: nil)
} else {
performSegue(withIdentifier: TO_LOGIN, sender: nil)
}
}
#objc func userDataDidChange(_ notif: Notification) {
setupUserInfo()
}
func setupUserInfo() {
if AuthService.instance.isLoggedIn {
loginBtn.setTitle(UserDataService.instance.name, for: .normal)
userImg.image = UIImage(named: UserDataService.instance.avatarName)
userImg.backgroundColor = UserDataService.instance.returnUIColor(components: UserDataService.instance.avatarColor)
} else {
loginBtn.setTitle("Login", for: .normal)
userImg.image = UIImage(named: "menuProfileIcon")
userImg.backgroundColor = UIColor.clear
}
}
// Protocols for UITableViewDataSource
// # of sections
// # rows in the section
// function to setup the cells
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "channelCell", for: indexPath) as? ChannelCell {
I double check the reusable identifier is OK
let channel = MessageService.instance.channels[indexPath.row]
cell.configureCell(channel: channel)
return cell
} else {
return UITableViewCell()
}
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if MessageService.instance.channels.count == 0 {
tableView.setEmptyView(title: "Message!", message: "You don´t have any channel, create a new one")
}
return MessageService.instance.channels.count
}
}
this is the view I want to show when I click on the addChannel function
view to present
and this is the debug area
debug area

Answer 1

You are making a very common mistake. The line
let addChannel = ChannelVC()
creates a new instance of the controller which is not the instance in the storyboard. Therefore the outlets are not connected and the code crashes.
Replace it with (adjust the identifier accordingly)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let addChannel = storyboard.instantiateViewController(withIdentifier: "ChannelVC") as! ChannelVC
or create a segue.