TableView empties when interacting - ios

Question

So I have 2 Views that are shown inside a UIView, based on what is selected on the SegmentViewController. I create dummy data, returning 20 row of a custom cell. This works great.
Everything is fine, till I interact with the TableView.
Bellow is my code:
GoalsViewController.swift
import UIKit
class GoalsViewController: UIViewController {
#IBOutlet weak var goalsTableView: UITableView!
let goalCellIdentifier = "goalCell"
override func viewDidLoad() {
super.viewDidLoad()
goalsTableView.delegate = self
goalsTableView.dataSource = self
goalsTableView.register(UINib(nibName: "GoalsViewCell", bundle: nil), forCellReuseIdentifier: goalCellIdentifier)
goalsTableView.reloadData()
}
}
extension GoalsViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 20
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = goalsTableView.dequeueReusableCell(withIdentifier: goalCellIdentifier, for: indexPath) as! GoalsViewCell
cell.goalTitle.text = "aaaaa"
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Selected \(indexPath.row)")
}
}
After any of the empty rows is selected, the didSelectRowAt is not called, so the cells are not there at all. I tried to find a solution, but I was only to find issues about empty lists, before being populated.
What could be the reason for the empty tableview?

Answer 1

I might be wrong here but one thing that I've noticed is that you are not implementing a function which sets the height of each cell.
// Specify the height of your cells
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100 // Or your given cell height.
}
So here is my theory: If you are using constraints something is missing and your cell's height can't be identified by constraints alone or you are not using constraints at all thus you must use heightForRowAt function to specify each cell's height.

Answer 2

I will explain what was the issue for people who probably did not know (like me).
So my UITableView is inside a UIView that changes based on what the user is selecting. In total I had 2 different Views that where switching. The reason that it was emptying it was because my parent ViewController, could not access the delegate for UITableView. To fix that, after adding a subview to the UIView, you need also to move the ViewController to the parent controller. In code it goes like this.
// Empty array of UIViewControllers
var views: [UIViewController]!
// Add the UIViewControllers to the array
views = [UIViewController()]
views.append(EventsViewController())
views.append(GoalsViewController())
for view in views {
// Needed to adjust the size of Subview to size of View
view.view.frame = containerView.bounds
// Add the subviews
containerView.addSubview(view.view)
}
// Bring the view in position 1 to the front of the UIView
containerView.bringSubviewToFront(views[1].view)
// Add Views[1] UIViewController as a child to the parent controller
self.addChild(views[1])
views[1].didMove(toParent: self)
// After done with everything with the UIViewController remove it
views[1].removeFromParent()
addChild Apple.com
didMove Apple.com