UITableViewController showing white blank screen in simulator

Question

I am trying to make a very simple iOS app that has begins at one UITableViewController and when you click on each cell (a different manner kids should learn) it pushes that specific data to a UIViewController . I have added placeholder information in the cells, but when I run the simulator only a blank screen shows up. I attach pictures and code below.

class TableViewController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }


    @IBAction func backBtn(_ sender: AnyObject) {
        dismiss(animated: true, completion: nil);
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 0
    }

}

class ViewController: UIViewController, UITableViewDelegate {

    @IBOutlet var tableView: UITableView!

    var names = ["Manner 1", "Manner 2", "Manner 3", "Manner 4", "Manner 6", "Manner 7", "Manner 8"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 8
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        var cell = self.tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath as IndexPath) as! Manner2Cell

        cell.name.text = names[indexPath.row]

        return cell
    }

}

//Manner2Cell actually refers to the first cell. I know I know bad naming convention.

class Manner2Cell: UITableViewCell {
    @IBOutlet weak var name: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}

Looking at all of this it looks like I have some repeated code. I feel like this is an easy fix but I just can't figure it out!

Answer 1

You have to set your ViewController as a dataSource for your tableView and adopt the protocol UITableViewDataSource .

class ViewController: UITableViewDelegate, UITableViewDataSource, ... {
    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.delegate = self // Assigns ViewController as delegate for tableView 
        tableView.dataSource = self
    }

Answer 2

The scene in the upper left of your Interface Builder screen snapshot looks like a UITableViewController (which is presumably the class you call TableViewController ).

But your numberOfSections and numberOfRowsInSection both return zero. So you'll have a blank white screen. Frankly, it looks like the code intended for the first scene's UITableViewController subclass has been put in the second scene's view controller.

---

Your second scene (upper right of your snapshot) is a little confusing, because it looks like that's a UITableViewController , too, but it doesn't look like it should be a table at all. I'm not sure what you're trying to do there. Is it really a table with repeated occurrences or is it just supposed to be the details of the cell you selected in the first scene? If it's just supposed to be a "details" screen, then that should be a simple UIViewController , not a UITableViewController .