CODEWITHSUNDEEP
iosswiftuitableview
P.Festus
P.Festus

Reputation: 95

Swift - tableview load error - the dreaded SIGBART

Started a Xcode project from scratch. Selected single view option. Dropped in a tableview over the view. Selected 1 cell prototype. Created a cell identifier "cell." Added UITableViewDelegate and functions needed to satisfy tableview protocol. The tableview is linked to the view controller. The code has no pre-run errors or warnings. However, I get this error:

2016-10-15 07:50:29.622 LawDataNHC[5219:196567] * Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3599.6/UITableView.m:8035 2016-10-15 07:50:29.650 LawDataNHC[5219:196567] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView (; layer = ; contentOffset: {0, 0}; contentSize: {375, 44}>) failed to obtain a cell from its dataSource ()' *** First throw call stack:

The material tableview code:

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

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
        return 1       
    }

    func numberOfSections(in tableView: UITableView) -> Int  {
        return 1
    }

    private func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = UITableViewCell(style: .default, reuseIdentifier: "cell")

        cell.textLabel?.text = "test"

        return cell
    }

Upvotes: 0

Views: 245

Answers (2)

Wilson
Wilson

Reputation: 9136

You've forgotten to name the protocol UITableViewDataSource in your ViewController

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

Also your cellForRowAt method shouldn't be private:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

And finally try use the dequeueReusableCell method for generating cells instead of creating new ones with UITableViewCell(style: .default, reuseIdentifier: "cell").

Your ViewController class should look like the following:

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 1
  }

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  //let cell = UITableViewCell(style: .default, reuseIdentifier: "cell")
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

    cell.textLabel?.text = "test"

    return cell
  }
}

Upvotes: 1

jagdish
jagdish

Reputation: 166

Your code returning nil tableView cell try with following: Replace with It:

private func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell")

    cell.textLabel?.text = "test"

    return cell
    }

Upvotes: 0

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