UITableViewDelegate not working getting an error (Fatal error: Unexpectedly found nil while unwrapping an Optional value in UITableView in swift 4)

Question

The data of namesArray and descriptionArray getting from previous VC.

I have set the delegate and datasource of my tableview but I am getting an below error

Unexpectedly found nil while unwrapping an Optional value

var namesArray: [String] = []
var descriptionArray: [String] = []
@IBOutlet weak var tblProjectList: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    print(namesArray.count)

    self.tblProjectList.delegate = self
    self.tblProjectList.dataSource = self
}

namesArray has data but why at self.tblProjectList.delegate = self app got crashed.

Answer 1

再次删除并创建tableview插座。

Answer 2

Define UITableViewDelegate and UITableViewDataSource in your UIViewController

Answer 3

Check your IBOutlet is connected to TableView. Sometimes it gets disconnected.

The process to check:

• Open storyboard and controller side by side and check.
• In case it is connected, in storyboard check if TableView delegates are connected.
• Also check the TableView hierarchy. In storyboard it might be out of scope to get connected.

Answer 4

If you are getting

"Unexpectedly found nil while unwrapping an Optional value"

Than there is some issue with cell identifier, array index not set proper. You can check this both scenario.