How to pass data From VC to Cell? - ios

Question

i am wondering how I can pass data from a ViewController to a cell?
I am a beginner so I may oversee the obvious :P
I have a home VC and when you press on a commentButton you get to the CommentVC which holds the postId of the post.
As I want to be able to like a comment( which works perfectly) and to notice the user about his comment being liked(which does not work for now) I need to have the postId not only in the commentVC ( which holds the correct one) but also in the cell.
this is the code where I pass data from the HomeVc to the CommentVC
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "CommentSegue" {
let commentVC = segue.destination as! CommentViewController
let commentCell = CommentTableViewCell()
let postId = sender as! String
commentCell.postId = postId
commentVC.postId = postId
}
}
When I print out both variables in CommentVc and CommentCell, only the CommentVc shows the correct one whereas the Cell has "nil" as the print out statement.
Any Idea how I can pass it?

Answer 1

You shouldn't instantiate UITableViewCells yourself by calling your custom classes initialiser, but you should do it in your UITableViewController class (or a class that conforms to UITableViewContollerDataSource protocol).
Pass the data you want to show in your cells to your table view controller and in your data source methods (for example tableView(_:cellForRowAt:)) when creating your cell using dequeueReusableCell(withIdentifier:) assign the data to the specific cell.

Answer 2

You should not pass a table cell. Since you already passed the postId to your comment view controller, you can access to this id from a table view cell in your comment view controller in this way
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "EditorFontCell") as! EditorFontCell
print(self.postId)
//do what you want with postId with the current cell object here
return cell
}
Now remove the cell in segue
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "CommentSegue" {
let commentVC = segue.destination as! CommentViewController
let postId = sender as! String
commentVC.postId = postId
}
}

Answer 3

Where did you perform the print out statement? Typically, it is recommended to pass any data to the cell view in cellForRow of TableView delegate method. Inside the cell class, you can have a configure(_ myId: String) method with the id as one of the parm to be passed in. Then print it inside that method.

Answer 4

//In cell table cell class create a variable to hold the data. Here I made postId as String variable.
class EditorFontCell: UITableViewCell{
var postId: String! // postId may be other type
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
}
// in this method you create an object i.e. cell, of type EditorFontCell
// and you can access that postId by this tableCell object. You can simple assign a value to as shown below.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "EditorFontCell") as! EditorFontCell
cell.postId = "String data"
return cell
}