I do not know what to set the value to in the code below. It has to be done manually because the real structure is slightly more complex than this example.
struct Something: Decodable {
value: [Int]
enum CodingKeys: String, CodingKeys {
case value
}
init(from decoder: Decoder) {
let container = try decoder.container(keyedBy: CodingKeys.self)
value = ??? // <-- what do I put here?
}
}
Your code doesn't compile due to a few mistakes / typos.
To decode an array of Int write
struct Something: Decodable {
var value: [Int]
enum CodingKeys: String, CodingKey {
case value
}
init (from decoder :Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
value = try container.decode([Int].self, forKey: .value)
}
}
But if the sample code in the question represents the entire struct it can be reduced to
struct Something: Decodable {
let value: [Int]
}
because the initializer and the CodingKeys can be inferred.
[Int.self] . Didn't realize the .self had to be on the outside
Array.self and Array<Int>.self (e.g. [Int].self) will be inferred from value’s declared type.Thanks for Joshua Nozzi's hint. Here's how I implement to decode an array of Int:
let decoder = JSONDecoder()
let intArray = try? decoder.decode([Int].self, from: data)
without decoding manually.
In my case, this answer was very helpful
I had a JSON in format: "[ "5243.1659 EOS" ]"
So, you can decode data without keys
struct Model: Decodable {
let values: [Int]
init(from decoder: Decoder) throws {
var container = try decoder.unkeyedContainer()
let values = try container.decode([Int].self)
self.values = values
}
}
let decoder = JSONDecoder()
let result = try decoder.decode(Model.self, from: data)
Or you can do it generic:
let decoder = JSONDecoder()
let intArray:[Int] = try? decoder.decode(T.self, from: data)
