soleil soleil - 4 years ago 110
Swift Question

Simple UITableView in Swift - unexpectedly found nil

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?

Answer Source

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
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