Swift: TableView in ViewController

i might be late and you may have fixed this by now. The error you are getting is due to your variable or constant returning a nil value. to test this you can assign a value to it (hard code it) and check the full code if it is working and then change it to your array, unfortunately i do stuff programmatically and not very familiar with the storyboard.

if you share your code we will be assist you if this is not yet sorted.

You add a new table view instance variable below the class declaration.

@IBOutlet weak var tableView: UITableView!

To conform to the UITableViewDelegate and UITableViewDataSource protocol just add them separated by commas after UIViewController in the class declaration

After that we need to implement the tableView(_:numberOfRowsInSection:), tableView(_:cellForRowAtIndexPath:) and tableView(_:didSelectRowAtIndexPath:) methods in the ViewController class and leave them empty for now

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    ...

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 0 // your number of cells here
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        // your cell coding 
        return UITableViewCell()
    }

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        // cell selected code here
    }
}

As mentioned by @ErikP in the comments, you also need to set

self.tableView.delegate = self

self.tableView.dataSource = self

in the viewDidLoad method.

(or in Storyboard works well too).