How to Implement pagination in table view cell - ios

Question

My app retrieves json from the newsAPI.com . When I look at the json returned from the web service , it shows 2000 values however it returns 20 values loaded into my tableview controller. How do I increase the value so that when the user scrolls down the table view, they are presented with more values loaded into the table view controller?
class LatestNewsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
let newsData = Articles() //Model object
let urlRequest = "https://newsapi.org/v2/everything?q=coronavirus&apiKey=d32071cd286c4f6b9c689527fc195b03" //Website API
var urlSelected = ""
var articles: [Articles]? = [] // holds array of Articles data
var indexOfPageToRequest = 1
#IBOutlet weak var table_view: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
table_view.cellLayoutMarginsFollowReadableWidth = true
navigationController?.navigationBar.prefersLargeTitles = true
retriveData( )
}
func retriveData( )->Int{
guard let aritcleUrl = URL(string: urlRequest) else { //send a request to the server
return n
}
let request = URLRequest(url: aritcleUrl)
let task = URLSession.shared.dataTask(with: request, completionHandler: { (data, response, error) -> Void in //collects content from website
if error != nil { // checks if content is available
print(error ?? 0)
return
}
if let data = data { // converts data to an array of Article objects
self.articles = self.parseData(data: data)
}
})
task.resume()
return n
}
func parseData(data:Data)-> [Articles] {
var articles: [Articles]? = [] // holds parsed data
do {
let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
let jsonArticles = jsonResult?["articles"] as? [AnyObject] ?? [] // gets first head of json file and converts it to dictionary
for jsonArticle in jsonArticles{ // captures data and stores it in the model object
let article = Articles()
article.author = jsonArticle["author"] as? String
article.title = jsonArticle["description"] as? String
article.publishedAt = jsonArticle["publishedAt"] as? String
article.urlImage = jsonArticle["urlToImage"] as? String
article.urlWebsite = jsonArticle["url"] as? String
articles?.append(article) //put article data in the array
}
print(jsonArticles)
DispatchQueue.main.async {
if(articles!.count > 0)
{
self.table_view.reloadData()
}
}
} catch {
print("Nothing my guy\(error)")
}
return articles ?? [] // returns an array of articles
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return articles?.count ?? 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell1", for: indexPath) as! NewsTableViewCell
cell.authorName.text = articles?[indexPath.row].author
cell.headLine.text = articles?[indexPath.row].title
cell.newsImage.downloadImage(from:(self.articles?[indexPath.item].urlImage ?? "nill"))
cell.timePublication.text = articles?[indexPath.row].publishedAt
return cell
}
[1]: https://i.stack.imgur.com/OY5G5.png

Answer 1

First, I would check the constraints of the table view, because this is a common issue (usually 0,0,0,0)
And also I would check the 'scrolling enabled' in the Attribute inspector and 'reuse Identifier'