Simple UITableView in Swift - unexpectedly found nil


Solution 1

When you create a view in code, its IBOutlet properties don't get hooked up properly. You want the version that you get back from dequeueReusableCellWithIdentifier:

let cell = tableView.dequeueReusableCellWithIdentifier("BookCell") as BookTableViewCell

Solution 2

If you're using storyboard, make sure you don't have this line at the start of your file:

self.tableView.registerClass(CustomTableViewCell.self, forCellReuseIdentifier: "customCell")

It will overwrite the storyboard and as a result, the outlet links in the storyboard are ignored.

Solution 3

I was getting this error because I didn't have the identifier written in the Storyboard of the Custom Cell.


Also make sure it matches you code in:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell

        let cell = tableView.dequeueReusableCellWithIdentifier("CustomTableCell") as CustomTableCell


Solution 4

Possibly that your view in Main.Storyboard lost its IBOutlet reference in ViewController file, just link it again.

Solution 5

Do not forget to register nib (tested with Swift3), e. g. inside override func viewDidLoad():

self.tableView.register(UINib(nibName: "BookTableViewCell", bundle: nil), forCellReuseIdentifier: "BookCell")

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Updated on February 27, 2020


  • soleil
    soleil almost 3 years

    Pretty simple code:

    func numberOfSectionsInTableView(tableView: UITableView?) -> Int {
        return 1
    func tableView(tableView:UITableView!, numberOfRowsInSection section:Int) -> Int {
        return 5
    func tableView(tableView:UITableView!, cellForRowAtIndexPath indexPath:NSIndexPath!) -> UITableViewCell! {
        let cell: BookTableViewCell = BookTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "BookCell")
        println("ip: \(indexPath.row)")
        cell.bookLabel.text = "test"
        return cell

    On the cell.bookLabel.text line I get this:

    fatal error: unexpectedly found nil while unwrapping an Optional value

    The BookTableViewCell is defined like this:

    class BookTableViewCell: UITableViewCell {
        @IBOutlet var bookLabel: UILabel
        override func awakeFromNib() {
            // Initialization code
        override func setSelected(selected: Bool, animated: Bool) {
            super.setSelected(selected, animated: animated)
            // Configure the view for the selected state

    And bookLabel is correctly hooked up in a Prototype cell in the Storyboard. Why am I getting this error?

  • Vincil Bishop
    Vincil Bishop about 8 years
    This was the right answer for me...was pulling my hair out.
  • Cesare
    Cesare over 5 years
    Thanks so much. I was so used to write this when I was doing everything programmatically.
  • Adam Fendley
    Adam Fendley almost 5 years
    In my case I had a stale IBOutlet reference that was causing this error. Thanks for the suggestion.
  • Giovanni Palusa
    Giovanni Palusa over 4 years
    Finally a good answer on this question - I spent the last hour of trying to figure this one out...
  • Lax
    Lax about 4 years
    Instead, to register the cell, use self.tableView.register(UINib(nibName: LXIssueConstants.issueCell, bundle: nil), forCellReuseIdentifier: LXIssueConstants.issueCell)
  • stepheaw
    stepheaw over 3 years
    This was the case using Xamarin iOS storyboards. I just needed to clear the TableView name property, save the storyboard. Re-enter the TableView name, and then delete bin and obj folders