TableView external dataSource and Delegate not loading - ios

Question

I have a tableview that is added programatically below that I want to hook up the delegate and dataSource to an external class. The code looks right however the tableview gets added to the view without getting the cell layout from the external class.
let tableView: UITableView = {
let dataService = ActivityDataService()
let tb = UITableView()
tb.tableHeaderView = nil
tb.tableFooterView = nil
tb.rowHeight = 50
tb.estimatedRowHeight = 50
tb.dataSource = dataService
tb.delegate = dataService
tb.register(ProfileActivitySubCell.self, forCellReuseIdentifier: "tableCell")
return tb
}()
Here is the activity service class:
class ActivityDataService: NSObject, UITableViewDelegate, UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 4
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "tableCell", for: indexPath) as! ProfileActivitySubCell
return cell
}
func tableView(_ tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
return 0
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 50
}
}
Thanks

Answer 1

When using a UITableView thats not in a storyboard or similar you need to register the cell with an identifier.
Depending on your UITableViewCell (if its a subclass and/or if you are using nibs or not)
You could use one of these methods:
open func register(_ nib: UINib?, forCellReuseIdentifier identifier: String)
open func register(_ cellClass: Swift.AnyClass?, forCellReuseIdentifier identifier: String)
Which is methods of UITableView
In your case probably something like this:
tb.register(ProfileActivitySubCell.classForCoder(), forCellReuseIdentifier: "tableCell")

Answer 2

1) Refactor the table view data source methods to a separate class
class IceCreamListDataSource: NSObject, UITableViewDataSource
{
// MARK: - Table view data source
func numberOfSectionsInTableView(tableView: UITableView) -> Int
{
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return 5
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCellWithIdentifier("IceCreamListCell", forIndexPath: indexPath)
return cell
}
}
2) In your controller class do this-:
class IceCreamListViewController: UITableViewController
{
let dataSource = IceCreamListDataSource()
// MARK: - View lifecycle
override func viewDidLoad()
{
super.viewDidLoad()
tableView.dataSource = dataSource
}
}

Answer 3

I managed to solve the issue. As the tableView was inside a collection view I had to use a storyboard object outlet. Finally inside the collection view cell I had to set the delegate and dataSource to the newly created object.
cell.tableView.dataSource = dataService
cell.tableView.delegate = dataService