How do I load a remote JSON file in Swift? - json

Question

I'm pretty much a complete beginner to Swift. I've played around with SwiftUI a bit, but that's about it. Needless to say, I have no idea how classes, structs, protocols, and everything else works in Swift.
I'm currently trying to figure out how to load a JSON file into Swift, and I cannot for the life of me get it to work. I would think that such a thing would be fairly rudimentary for such a modern language, but apparently not. After trying multiple tutorials and examples, I've come up with this messy code:
public class JSONReader {
struct DatabaseObject: Decodable {
let name: String
let books: AnyObject
let memoryVerses: AnyObject
}
private func parse(jsonData: Data) {
do {
let decodedData = try JSONDecoder().decode(DatabaseObject.self, from: jsonData)
print(decodedData)
} catch {
print("decode error")
}
}
private func loadJson(fromURLString urlString: String,
completion: #escaping (Result<Data, Error>) -> Void) {
if let url = URL(string: urlString) {
let urlSession = URLSession(configuration: .default).dataTask(with: url) { (data, response, error) in
if let error = error {
completion(.failure(error))
}
if let data = data {
completion(.success(data))
}
}
urlSession.resume()
}
}
init() {
loadJson(fromURLString: "Redacted for privacy") { result in
switch result {
case .success(let data):
self.parse(jsonData: data)
case .failure(let error):
print(error)
}
}
}
}
I keep getting the buildtime error Type 'JSONReader.DatabaseObject' does not conform to protocol 'Decodable'
Any help, pointers, or tips would be greatly appreciated!

Answer 1

The type AnyObject is not decodable by swift , The books property you are trying to decode and memoryVerse are not decodable , If you want to Decode this you can define their types separately as codable structs like so
struct Book : Codable{
let property : String
let otherProperty : String
}
struct Memory : Codable{
let property : String
let otherProperty : String
}
struct DatabaseObject: Decodable {
let name: String
let books: Book
let memoryVerses:Memory
}