Display Api data from strict model in swift UI - Ios swift

HackerHard
August 7, 2022
252 views
0 votes
2 Answers

I am new to swift coding, I am trying to fetch data from API and was able to print data in the console as per below format after doing changes in model file.

Result(
    customerList: [
        walletApp.ResultItem(
            accountId: "00000023880",
            card: "5120"
        ),
        walletApp.ResultItem(
            accountId: "3880",
            card: "581"
        ),
        walletApp.ResultItem(
            accountId: "3881",
            card: "750"
        )
    ]
)

Below is my viewmodel code

import Foundation

class apiCall {
    func getUsers(completion:@escaping ([Result]) -> ()) {
        
        let url = URL(string: "http://myapi-call-ges-here")!
        var request = URLRequest(url: url)
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")
        request.httpMethod = "GET"

        URLSession.shared.dataTask(with: request) { (data, response , error) in
     
            do{
                let result = try JSONDecoder().decode(Result.self,from: data!)
                print(result)
                
            }
            catch{
                print("Error:(error)")
            }
         }.resume()
        }
}

Below is my STRUCT code

import SwiftUI

struct Result: Codable {
    let customerList:[ResultItem]
    
}

struct ResultItem:Codable{
    let accountId: String
    let card:String
}

Below is my VIEW page where i need to display accountId and card in a LIST

import SwiftUI

struct successLogin: View {
    @State var users: [Result] = []
    var body: some View {
        Text("USERS LIST")
            .bold()
            .font(.largeTitle)
            .underline()
//        List(users){ user in
//
//            Text(Result)
//                .font(.headline)
//            Text(Result)
//                .font(.subheadline)
//        }
            
            .onAppear{
                apiCall().getUsers{(users) in self.users = users
                    
                }
            }
           //.padding()
    }
}

in the commented LIST code, what changes do i need to make to display data of card and accountId

Answers

try something like this approach:

struct successLogin: View {
    @State var users: [ResultItem] = []  // <-- here
    var body: some View {
        Text("USERS LIST")
            .bold()
            .font(.largeTitle)
            .underline()
        
        List(users){ user in
            Text(user.accountId)  // <-- here
                .font(.headline)
            Text(user.card)       // <-- here
                .font(.subheadline)
        }
        .onAppear{
            ApiCall().getUsers { users in
                self.users = users
                
            }
        }
        //.padding()
    }
}

struct Result: Codable {
    let customerList:[ResultItem]
}

struct ResultItem: Codable, Identifiable { // <-- here
    let id = UUID()  // <-- here
    let accountId: String
    let card:String
}

class ApiCall {
    
    func getUsers(completion:@escaping ([ResultItem]) -> ()) { // <-- here
        
        let url = URL(string: "http://myapi-call-ges-here")!
        var request = URLRequest(url: url)
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")
        request.httpMethod = "GET"
        
        URLSession.shared.dataTask(with: request) { (data, response , error) in
            // guard for data, todo
            do {
                let result = try JSONDecoder().decode(Result.self,from: data!)
                print(result)
                completion(result.customerList) // <-- here
            } catch {
                print("Error:(error)")
                completion([]) // <-- here
            }
        }.resume()
    }
}

MVVM architecture

// ViewModel
final class SuccessLoginViewModel: ObservableObject {
   @Published var users: Result = .init(customerList: [])

   func getUsers() {
        
        let url = URL(string: "http://myapi-call-ges-here")!
        var request = URLRequest(url: url)
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")
        request.httpMethod = "GET"

        URLSession.shared.dataTask(with: request) { (data, response , error) in
     
            do{
                let result = try JSONDecoder().decode(Result.self, from: data!)
                self.users = result
                
            }
            catch{
                print("Error:(error)")
            }
         }.resume()
        }
}

// SwiftUI View
struct successLogin: View {
    @ObservedObject model

    var body: some View {
        Text("USERS LIST")
            .bold()
            .font(.largeTitle)
            .underline()
        List(model.users.customerList) { user in
            Text(user.accountId)
               .font(.headline)
            Text(user.card)
                .font(.subheadline)
        }
            .onAppear{
                model.getUsers()
            }
    }
}

I recommend using this approach.

(I wrote this without a compiler, so there may be errors, but the gist should be clear)

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Display Api data from strict model in swift UI – Ios swift

Answers