Swift: How to Load JSON in different Table View - ios

Question

Hi everybody I'm new to Swift and I need help.
So I have three different JSON that will show in different moments, The first JSON has been loading perfectly, but when I clicking on the item to reload another JSON and show the detail nothing appears.
I'm confused about details:
Need I have three differents table Views for each JSON? or the only one is enough?
When I working with data (JSON) need I use a specific function to prepare the new JSON that will appear as "prepare"?
In my project I have:
Two view controllers: ViewController(default) and DetailViewController.
In my Main.Storyboard: Tab Bar Controller --> Navigation --> Table View
The code of the first View controller:
import UIKit
class ViewController: UITableViewController {
var categories = [Category]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let urlString = "https://www.themealdb.com/api/json/v1/1/categories.php"
if let url = URL(string: urlString) {
if let data = try? Data(contentsOf: url) {
parse(json: data)
} else {
print("error connecting")
}
}
}
func parse(json: Data) {
let decoder = JSONDecoder()
print("parse called")
do {
let jsonCategories = try decoder.decode(Categories.self, from: json)
categories = jsonCategories.categories
tableView.reloadData()
} catch {
print("error parsin: \(error)")
}
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return categories.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let category = categories[indexPath.row]
cell.textLabel?.text = category.idCategory
cell.detailTextLabel?.text = category.strCategoryDescription
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let newViewController = DetailViewController()
self.navigationController?.pushViewController(newViewController, animated: true)
}
}
The code of the second view controller:
import UIKit
import WebKit
class DetailViewController: UIViewController {
var webView: WKWebView!
var meals = [Meal]()
override func loadView() {
webView = WKWebView()
view = webView
}
override func viewDidLoad() {
super.viewDidLoad()
let urlString = "https://www.themealdb.com/api/json/v1/1/filter.php?c=Beef"
if let url = URL(string: urlString) {
if let data = try? Data(contentsOf: url) {
parse(json: data)
} else {
print("error connecting")
}
}
}
func parse(json: Data) {
let decoder = JSONDecoder()
print("parse called")
do {
let jsonMeals = try decoder.decode(Meals.self, from: json)
meals = jsonMeals.meals
print(String(format:"read %d meals", meals.count))
} catch {
print("error parsin: \(error)")
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return meals.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let meal = meals[indexPath.row]
cell.textLabel?.text = meal.idMeal
cell.detailTextLabel?.text = meal.strMeal
return cell
}
}

Answer 1

The function parse(json: Data) on DetailViewController does not call tableView.reloadData() so the new data cannot be loaded to UITableView
Need I have three differents table Views for each JSON? or the only one is enough?
If you're loading different JSON files but want to show in the same view. You only need 1 UITableViewCell.
When you load & decode JSON, consider moving it to background queue to avoid blocking main thread.