Two Table Views In Different View Controllers one working and one not(Swift 4)

Question

I'm aiming to build an app where there are two lists in two different views 1 is called Shopping List and the second pantry list. This is in a tabbed application template. I first set up the shopping list tab with a view containing a table view which gets its data to fill the view from a common variable file and this works fine. However, I copied and pasted the same code into the second view controller(Changing all the variables and references INCLUDING the @IBOutlet Link) and this tab shows only an empty table view.

Shopping list Tab View Controller

class ShoppingListTabViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {


@IBOutlet weak var ShoppingListTableView: UITableView!

//Set the # of rows in the shopping List
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { //Set the # of rows
    return(Common.Global.shoppingList.count)
}

//Define what a cell looks like
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    //Create a cell with the default style and the id of the Table in the Shopping List tab
    let shoppinglistItem = UITableViewCell(style: UITableViewCell.CellStyle.default, reuseIdentifier: "shoppingListCell")
    shoppinglistItem.textLabel?.text = Common.Global.shoppingList[indexPath.row] //Fill the table with the items from the  shoppingList
    return(shoppinglistItem)

}

}

Pantry List Tab View Controller

class PantryListTabViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {


@IBOutlet weak var PantryListTableView: UITableView!

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    //Set the number of rows in table
    return(Common.Global.pantryItems.count)
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    //Setup the cell which each item will be stored in
    let pantryItemsCell = tableView.dequeueReusableCell(withIdentifier: "PantryListItem", for: indexPath)

    pantryItemsCell.textLabel!.text = Common.Global.pantryItems[indexPath.row]
    return(pantryItemsCell)
}

}

They both reference the same Common file which contains two lists one called ShoppingList and the other pantry items

I'm sorry if I stuffed up asking the question.

Answer 1

Your class PantryListTabViewController is already conforming to both TableView Protocols (UITableViewDelegate and UITableViewDataSource)

These protocols tell other classes that this class (PantryListTabViewController) has implemented some specific methods or properties

However, the TableView needs to know, that this class (PantryListTabViewController) is the class the TableView should use to populate it's content and some other things.

Therefore, in your viewDidLoad(), you need to set up your class as the Delegate and DataSource for the TableView:

override func viewDidLoad() {

    // Call the super method.
    super.viewDidLoad()

    // Setup Delegate and DataSource for the TableView.
    tableView.delegate = self
    tableView.dataSource = self
}

Please consider that you need an IBOutlet of your TableView called tableView (you can obviously rename it)

Hope this helps!