Question 67132 in IOS Swift Question posted in
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UITableView cellForRowAt method is not getting executed – Ios swift

extension ArticlesViewController {
    func setup() {
        self.navigationController?.navigationBar.prefersLargeTitles = true
    
    newtworkManager?.getNews { [weak self] (results) in
        switch results {
        case .success(let data):
            self?.articleListVM = ArticleListViewModel(articles: data.article!)
            // For testing
            print(self?.articleListVM.articles as Any)
            
            DispatchQueue.main.async {
                self?.tableView.reloadData()
            }
        case .failure(let error):
            print(error.localizedDescription)
        }
    }
}

Now, while debugging, I am receiving data successfully and printing it out. However, I realized the cellForRowAt function is not being executed which is causing the data not showing on the table. I cannot see any issue, but the run time disagrees of course.

extension ArticlesViewController {
override func numberOfSections(in tableView: UITableView) -> Int {
    return self.articleListVM == nil ? 0 : self.articleListVM.numberOfSections
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.articleListVM.numberOfRowsInSection(section)
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "ArticleTableViewCell", for: indexPath) as? ArticleTableViewCell else {
        fatalError("ArticleTableViewCell not found")
    }
    
    let articleVM = self.articleListVM.articleAtIndex(indexPath.row)
    cell.titleLabel.text = articleVM.title
    cell.abstractLabel.text = articleVM.abstract
    return cell
}

}

Why do you think this method is not getting triggered? Note that my UITableView and UITableViewCell on the storyboard are connected respectively to my code. I see no reason why it is not loading the data.

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3

Answers


  1. Chosen as BEST ANSWER
    0

    My main issue was with the global variable newtworkManager And as you can see in code:

    newtworkManager?.getNews {...}

    The solution was that I deleted this global variable and replaced it with the following:

    NetworkManager().getNews { ...}

    After that, cellForRowAt method was working fine and data cells were displayed on the UITableView.


  2. 0

    Confirm ArticlesViewController to UITableViewDelegate & UITableViewDataSource protocol & remove override for functions.
    Example:

    extension ArticlesViewController: UITableViewDelegate, UITableViewDataSource {
    func numberOfSections(in tableView: UITableView) -> Int {
        return self.articleListVM == nil ? 0 : self.articleListVM.numberOfSections
    }

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

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

    Also make sure you have connected your tableview via storyboard/code.

    tableView.dataSource = self
tableView.delegate = self
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  3. 0

    How have you layed out the views, programmatically or via Storyboard?

    If done via Storyboard:

    1. Make sure to connect the IBOutlet properly(check for typos etc),
      assign delegate & datasource to the tableviews and conform to the
      protocols.

    If done programmatically:

    1. Make sure you set the delegate and datasource of the data before
      calling tableView.reloadData()

      tableView.dataSource = self
tableView.delegate = self
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