CODEWITHSUNDEEP
swiftxcode
k-hir
k-hir

Reputation: 3

error message "Unexpectedly found nil while unwrapping an Optional value" even its cell is not nil

xcode: 9.4.1

I'm creating a simple table view but I keep getting the same "Unexpectedly found nil while unwrapping an Optional value" error when it comes to set a value to a component in each cell.

import UIKit

class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {

    @IBOutlet weak var conditionTable: UITableView!

    var conditions = [Condition]()

    override func viewDidLoad() {
        super.viewDidLoad()

        conditionTable.register(ConditionCell.self, forCellReuseIdentifier: "conditionCell")
        conditionTable.delegate = self
        conditionTable.dataSource = self
        setInitData()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func setInitData() {
        conditions.append(Condition(name: "a"))
        conditions.append(Condition(name: "b"))
    }

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell: ConditionCell = tableView.dequeueReusableCell(withIdentifier: "conditionCell") as? ConditionCell
            else {
                fatalError()
        }
        print(cell.conditionLabel.text)
//        cell.setCell(condition: conditions[indexPath.row])
        return cell
    }

}

I did name my custom cell "ConditionCell" and I did name the identified "conditionCell".

Here is my custom cell class. I did add the component(label) reference to the class. It looks like the custom view class is successfully loaded (not nil) however its component (label) is not.

import UIKit

class ConditionCell: UITableViewCell {
    @IBOutlet weak var conditionLabel: UILabel!

    func setCell(condition: Condition) {
        print(conditionLabel)
        conditionLabel.text = condition.name
    }

}

Upvotes: 0

Views: 47

Answers (1)

Amit
Amit

Reputation: 4886

The problem is with this line :

conditionTable.register(ConditionCell.self, forCellReuseIdentifier: "conditionCell")

It requires UINib. Change it to:

conditionTable.register(UINib(nibName: "ConditionCell", bundle: nil), forCellReuseIdentifier: "conditionCell")

For more details check this :

Upvotes: 1

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