How do I get the document id by clicking the button on the tableview cell? - ios

Question

I am using a xib file apart from the main storyboard in my view controller for displaying a post item, and there is comment button, upon being clicked it should go to another page where the list of comments related to that post is available. for that I need to pass the documentId of the post as well so that the accurate segue operation could be performed.
I have tried my things by searching google but till now nothing had worked for me.
if any more details are required please let me know
HomeViewController Swift Class
class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var tableView:UITableView!
var posts = [Post]()
var db: Firestore!
var postKey:String = ""
private var documents: [DocumentSnapshot] = []
//public var posts: [Post] = []
private var listener : ListenerRegistration!
var detailView: Post?
override func viewDidLoad() {
super.viewDidLoad()
db = Firestore.firestore()
self.navigationController?.navigationBar.isTranslucent = false
tableView = UITableView(frame: view.bounds, style: .plain)
let cellNib = UINib(nibName: "PostTableViewCell", bundle: nil)
tableView.register(cellNib, forCellReuseIdentifier: "postCell")
tableView.backgroundColor = UIColor(white: 0.90,alpha:1.0)
view.addSubview(tableView)
var layoutGuide:UILayoutGuide!
if #available(iOS 11.0, *) {
layoutGuide = view.safeAreaLayoutGuide
} else {
// Fallback on earlier versions
layoutGuide = view.layoutMarginsGuide
}
tableView.leadingAnchor.constraint(equalTo: layoutGuide.leadingAnchor).isActive = true
tableView.topAnchor.constraint(equalTo: layoutGuide.topAnchor).isActive = true
tableView.trailingAnchor.constraint(equalTo: layoutGuide.trailingAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: layoutGuide.bottomAnchor).isActive = true
tableView.delegate = self
tableView.dataSource = self
tableView.reloadData()
retrieveAllPosts()
//checkForUpdates()
postKey = detailView!._documentId
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
tableView.reloadData()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! PostTableViewCell
cell.set(post: posts[indexPath.row])
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let post = self.posts[indexPath.row]
performSegue(withIdentifier: "toCommentsList", sender: indexPath)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
//segue.forward(posts, to: segue.destination)
guard let details = segue.destination as? CommentListViewController,
let index = tableView.indexPathForSelectedRow?.row
else {
return
}
// details.detailView = posts[index]
}
//I tried to connect this action to the button in the XIB file but not able to do so.
#IBAction func toCommentsSection(_ sender: Any) {
print(postKey + "hello")
// let postId11 = detailView?._documentId
performSegue(withIdentifier: "toCommentsList", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
var vc = segue.destination as! CommentListViewController
vc.postId = postKey
}
}
PostViewCell Class
class PostTableViewCell: UITableViewCell {
#IBOutlet weak var usernameLabel: UILabel!
#IBOutlet weak var profileImageView: UIImageView!
#IBOutlet weak var subtitleLabel: UILabel!
#IBOutlet weak var postTextLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
// profileImageView.layer.cornerRadius = profileImageView.bounds.height / 2
// profileImageView.clipsToBounds = true
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func set(post:Post) {
if let userprofileImagUrl = post._postuserprofileImagUrl,
let imageUrl = URL(string: userprofileImagUrl) {
ImageService.getImage(withURL: imageUrl) { image in
self.profileImageView.image = image
}
}
usernameLabel.text = post._username
postTextLabel.text = post._postContent
subtitleLabel.text = post._postcategory
}
}

Answer 1

In PostTableViewCell create outlet of comment buttons
class PostTableViewCell: UITableViewCell {
#IBOutlet weak var btnComment: UIButton!
now in cellForRowAtIndex do add following line too
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! PostTableViewCell
cell.btnComment.tag = indexPath.row
cell.btnComment.addTarget(self, action: #selector(self. toCommentsSection(sender:)) , for: .touchUpInside)
cell.set(post: posts[indexPath.row])
return cell
}
and in
#IBAction func toCommentsSection(_ sender: Any) {
let commentbutton = sender as! UIButton
let post = posts[commentbutton.tag]
postKey = post.postKey // or what key value it is
print(postKey + "hello")
// let postId11 = detailView?._documentId
performSegue(withIdentifier: "toCommentsList", sender: self)
}