populate tableview cell from complex api json using swift - arrays

Question

I'm trying to parse API JSON and display it in UITableView, but the problem is I cannot access all array in this API.
struct RootResults: Codable {
var results: [results]
}
// MARK: - results
struct results: Codable {
var container_number: String?
var commodities: [commodities]
}
// MARK: - commodities
struct commodities: Codable {
var commodity_name_en: String?
var varieties: [varieties]
}
// MARK: - varieties
struct varieties: Codable {
var variety_name_en: String?
var variety_name_ar: String?
}
import UIKit
class ViewController: UIViewController {
#IBOutlet var resultsTable: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
abuseedoAPIget()
}
var arrData = [results]()
var arrResults = [commodities]()
func abuseedoAPIget(){
let urlJSON = "http://abuseedotrading.com/apps/api/acp/?key=4ea1e08dd9ab329bbdaa9e5b42939c04&query=list_containers"
guard let url = URL(string: urlJSON) else {return}
URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let data = data else {return}
guard error == nil else {return}
do {
let decoder = JSONDecoder()
let APIResponse = try decoder.decode(RootResults.self, from: data)
self.arrData = APIResponse.results
DispatchQueue.main.async{
self.resultsTable.reloadData()
}
} catch let error {
print("Failed to decode JSON:", error)
}
}.resume()
}
}
extension ViewController: UITableViewDelegate, UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arrData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell", for: indexPath) as! TableViewCell
let dataa = arrData[indexPath.row]
cell.conLabel.text = dataa.container_number
cell.comLabel.text = dataa.commodity_name_en
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableView.automaticDimension
}
}

Answer 1

For Swift to be able to decode the JSON response into objects you need to have a similar structure defined in Swift using objects.
Your RootResults object needs to implement Codable protocol and represent the JSON structure.
Below a part of the returned JSON:
{
"status": 200,
"runtime": 1.7315270900726,
"results_count": 13,
"results": [
{
"container_id": 36473,
"container_number": "MMAU1163814",
"shipment_id": 17359,
}
}
RootResults would look something like this:
struct RootResults: Codable {
let status: Int
let runtime: Float
let results_count: 13
let results: [Container]
}
struct Container: Codable {
let container_id: Int
let container_number: String
let shipment_id: Int
}
More information on Swift Codable
Swift codable
SO question about
In the function tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) you are accessing data on different levels.
The container_number -property is accessible when retrieving an object from results. The commodity_name_en is a "level" deeper and part-of the commodities -array. To access the first item in the commodities -array , try the following:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell", for: indexPath) as! TableViewCell
let dataa = arrData[indexPath.row]
cell.conLabel.text = dataa.container_number
cell.comLabel.text = dataa.commodities[0].commodity_name_en
return cell
}
As Vadian mentions, it's common to start types(struct, class, enum) with a capital letter in Swift. Have a look at struct and classes documentation