#Published is not getting updated, State problem? - SwiftUI - swift

Question

Right now I have to call the function (calculatePortfolioGrossBalance) 3 times for the value to update, what am I doing wrong in the state logic?
In the code below, when I call in an init the function calculatePortfolioGrossBalance() it returns empty [], I have to call it 3 times for the value to update, However... if I print the values of getTokenBalancesModel in the line DispatchQueue.main.async { I can see the values are there, so how come in calculatePortfolioGrossBalance are not?
final class TokenBalancesClassAViewModel: ObservableObject {
#Published var getTokenBalancesModel: [TokenBalancesItemsModel] = [TokenBalancesItemsModel]()
#Published var portfolioGrossBalance: String = "0.0"
func calculatePortfolioGrossBalance() {
getTokenBalances()
DispatchQueue.main.async {
var totalBalance: Double = 0
for item in self.getTokenBalancesModel {
totalBalance += Double(item.quote!)
}
self.portfolioGrossBalance = String(format:"%.2f", totalBalance)
print(self.portfolioGrossBalance)
}
}
func getTokenBalances() {
guard let url = URL(string: "someUrlHeidiGaveMe") else {
print("Invalid URL")
return
}
print("Calling getTokenBalances() ...")
AF.request(url, method: .get).validate().responseData(completionHandler: { data in
do {
guard let data = data.data else {
print("Response Error:", data.error as Any)
return
}
let apiJsonData = try JSONDecoder().decode(TokenBalancesModel.self, from: data)
DispatchQueue.main.async {
self.getTokenBalancesModel = apiJsonData.data.items
}
} catch {
print("ERROR:", error)
}
})
}
}

Answer 1

you need to read up on using asynchronous functions, how to set them up and how to use them. This is important. Try something like this (untested):
final class TokenBalancesClassAViewModel: ObservableObject {
#Published var getTokenBalancesModel: [TokenBalancesItemsModel] = [TokenBalancesItemsModel]()
#Published var portfolioGrossBalance: String = "0.0"
func calculatePortfolioGrossBalance() {
getTokenBalances() { isGood in
if isGood {
var totalBalance: Double = 0
for item in self.getTokenBalancesModel {
totalBalance += Double(item.quote!)
}
self.portfolioGrossBalance = String(format:"%.2f", totalBalance)
print(self.portfolioGrossBalance)
}
}
}
func getTokenBalances(completion: #escaping (Bool) -> Void) {
guard let url = URL(string: "someUrlHeidiGaveMe") else {
print("Invalid URL")
completion(false)
return
}
print("Calling getTokenBalances() ...")
AF.request(url, method: .get).validate().responseData(completionHandler: { data in
do {
guard let data = data.data else {
print("Response Error:", data.error as Any)
completion(false)
return
}
let apiJsonData = try JSONDecoder().decode(TokenBalancesModel.self, from: data)
DispatchQueue.main.async {
self.getTokenBalancesModel = apiJsonData.data.items
completion(true)
}
} catch {
print("ERROR:", error)
completion(false)
}
})
}
}