why i am unable to download all json values in swift? - ios

Question

I have backend api it contains all values i can see those values in postman.. but while parsing i am unable to download all values from api.. some times i am getting all values.. some times i am not getting only some values.. if i close app and run again then i am getting all values.. again if i close and run or if i go to other viewcontroller and coming back to home then i am missing some values. if i print jsonObj i am not getting all values from api.. why is this happening?
here is my code:
import UIKit
import SDWebImage
struct JsonData {
var iconHome: String?
var typeName: String?
var id: String?
init(icon: String, tpe: String, id: String) {
self.iconHome = icon
self.typeName = tpe
self.id = id
}
}
class HomeViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UITextFieldDelegate {
#IBOutlet weak var collectionView: UICollectionView!
var itemsArray = [JsonData]()
override func viewDidLoad() {
super.viewDidLoad()
homeServiceCall()
//Do any additional setup after loading the view.
collectionView.delegate = self
collectionView.dataSource = self
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return itemsArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! HomeCollectionViewCell
let aData = itemsArray[indexPath.row]
cell.paymentLabel.text = aData.typeName
cell.paymentImage.sd_setImage(with: URL(string:aData.iconHome ?? ""), placeholderImage: UIImage(named: "varun finance5_icon"))
return cell
}
//MARK:- Service-call
func homeServiceCall(){
let urlStr = "https://dev.com/webservices//getfinancer"
let url = URL(string: urlStr)
URLSession.shared.dataTask(with: url!, completionHandler: {(data, response, error) in
guard let respData = data else {
return
}
guard error == nil else {
print("error")
return
}
do{
let jsonObj = try JSONSerialization.jsonObject(with: respData, options: .allowFragments) as! [String: Any]
print("the home json is \(jsonObj)")
let financerArray = jsonObj["financer"] as! [[String: Any]]
for financer in financerArray {
guard let id = financer["id"] as? String else { break }
guard let pic = financer["icon"] as? String else { break }
guard let typeName = financer["tpe"] as? String else { break } //changed this one to optional too. Avoid force-unwrapping. Keep everything safe
let jsonDataObj = JsonData(icon: pic, tpe: typeName, id: id)
self.itemsArray.append(jsonDataObj)
}
DispatchQueue.main.async {
self.collectionView.reloadData()
}
}
catch {
print("catch error")
}
}).resume()
}
}
Please help me in the above code.

Answer 1

Try network call with background thread.
DispatchQueue.global(qos: DispatchQoS.QoSClass.background).async {
self.homeServiceCall()
}
And the URL is legal with double / as below ?
let urlStr = "https://dev.com/webservices//getfinancer"
And check the all of your backend data's is compatible with your JSONSerialization type of JsonData struct.
I hope it helps.