How to transfer data between Class/func and View - swift

Question

I decoded json data from an API and now I want to transfer the decoded data to my view where it can be displayed.
the problem is that I cannot transfer the decoded data to my view with #Observable Object.
My decoding class looks like this:
class apirefresh: ObservableObject {
#Published var datareturn : DataClass
func refreshData() {
let url = URL(string: "http://localhost:3000/Data")!
url.getResult { (result: Result<DataClass, Error>) in
switch result {
case let .success(dataout):
self.datareturn = dataout
print(dataout)
//print(dataout.klasse[0].aktive[0].name) //dataout.klasse[0].aktive[0].name
case let .failure(error):
print(error)
}
}
}
}
and my error like this:
Class Error
I also got an error in my View but this error seams to be related to the previous error.
View Error
And my json model looks like this:
// MARK: - APICall
struct APICall: Codable {
let data: DataClass
enum CodingKeys: String, CodingKey {
case data = "Data"
}
}
// MARK: - DataClass
struct DataClass: Codable {
let klasse: Klasse
let update: Update
}
// MARK: - Klasse
struct Klasse: Codable {
let aktive, bjugend, cjugend, djugend: [Verein]
let ejugend, fjugend, bambini: [Verein]
}
// MARK: - Aktive
struct Verein: Codable {
let id, place: String
let name: String
let tore, punkte: String
let gruppe: String
}
// MARK: - Update
struct Update: Codable {
let last: String
}
Thanks for your help in advance.

Answer 1

The problem is that datareturn in this class doesn't have an initial value, which is why the compiler is asking for a class initializer wherein you would give datareturn an initial value. So you must either do that:
class apirefresh: ObservableObject {
#Published var datareturn : DataClass
init(datareturn: DataClass) {
self.datareturn = datareturn
}
func refreshData() {
let url = URL(string: "http://localhost:3000/Data")!
url.getResult { (result: Result<DataClass, Error>) in
switch result {
case let .success(dataout):
self.datareturn = dataout
print(dataout)
//print(dataout.klasse[0].aktive[0].name) //dataout.klasse[0].aktive[0].name
case let .failure(error):
print(error)
}
}
}
}
Or make datareturn an optional (which makes its initial value nil).
class apirefresh: ObservableObject {
#Published var datareturn : DataClass?
func refreshData() {
let url = URL(string: "http://localhost:3000/Data")!
url.getResult { (result: Result<DataClass, Error>) in
switch result {
case let .success(dataout):
self.datareturn = dataout
print(dataout)
//print(dataout.klasse[0].aktive[0].name) //dataout.klasse[0].aktive[0].name
case let .failure(error):
print(error)
}
}
}
}