Swift How to refactor getting data from API? - ios

Question

I'm trying to get data from API and display it in the tableView.
Because getting data from API used multiple times in my application. So I want to make it reusable.
I create a class called GetProducts to get the data from API, and save it to Posts
class GetProducts{
static var products = [Product]()
static func loadProducts( _ filter: [String:String]) {
// get data from API
// append products to products list
}
}
In the viewController, I want to fetch the products data from GetProducts class, and display it in the tableView
class MainViewController: UIViewController,UITableViewDataSource, UITableViewDelegate{
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
GetPeoducts.loadProducts([...])
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return GetProducts.products.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(for: indexPath) as ProductTableViewCell
cell.products = GetProducts.products
return cell
}
}
However, in the tableView, the products list is empty.
I cannot figure it out which step was wrong. Is there anyone can help me with logic?
Thanks in advance!

Answer 1

Basically, what I'm doing is using completion handler
class GetPosts{
static var products = [Product]()
static func loadProducts( _ filter: [String:String], completion:(([Product]) -> Void)?) {
// get data from API
// append products to products list
completion?(self.products)
}
}
Call the loadPoducts in ViewController:
class MainViewController: UIViewController,UITableViewDataSource, UITableViewDelegate{
#IBOutlet weak var tableView: UITableView!
var products = [Product]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
GetPeoducts.loadProducts(/*some params*/){ (products) in
self.products = products
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.products.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(for: indexPath) as ProductTableViewCell
cell.products = self.products
return cell
}
}
Thank you! #rmaddy #Vanya #Aakash #Jelord Rey