How to initialize UI things when reuse a UITableViewCell - ios

Question

I want to reuse a UITableViewCell in my app, but I get this error: Unexpectedly found nil while implicitly unwrapping an Optional value.
I find that this is because the UI things in UITableViewCell is nil, so my app crashed.
My UITableViewCell code is like this:
class WordListCell: UITableViewCell {
#IBOutlet weak var wordListCoverImage: UIImageView!
#IBOutlet weak var wordListName: UILabel!
#IBOutlet weak var wordListInfo: UILabel!
var wordList: WordList? {
didSet {
updateUI()
}
}
private func updateUI() {
wordListName.text = wordList?.name
wordListInfo.text = wordList?.description
wordListCoverImage = UIImage()
}
}
I create it in the storyboard and link the outlet to the code in the other TableView.
But this time, I want to reuse the cell in a new TableView which is all created by code, so I don't know how to initialize the UI things.
The new UITableView code is like this:
tableView.delegate = self
tableView.dataSource = self
tableView.register(WordListCell.self, forCellReuseIdentifier: "wordListCell")
//the delegate
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return wordLists.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let wordList = wordLists[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "wordListCell", for: indexPath)
if let wordListCell = cell as? WordListCell {
wordListCell.wordList = wordList
}
return cell
}
Please tell me how to reuse the cell.Thanks!

Answer 1

Okay so I think what you are doing wrong is when you create a custom tableView cell, you are not assigning a UIImage. So instead try doing this wordListCoverImage = UIImage(named: wordList.imageName).
Now also in your tableView class inside viewDidLoad() apart from adding
tableView.delegate = self
tableView.dataSource = self
tableView.register(WordListCell.self, forCellReuseIdentifier: "wordListCell")
Then at let cell = tableView.dequeueReusableCell(withIdentifier: "wordListCell", for: indexPath) downcast it as a custom cell class like so.
let cell = tableView.dequeueReusableCell(withIdentifier: "wordListCell", for: indexPath) as! WordListCell
And then finaly under that set the cell.delegate = self
I hope this helps!