问如何在Swift中提取嵌套Json

EN

struct Items: Codable {
    let item: Item
}

struct Item: Codable {
    let id: Int
    let title, subtitle, body, date: String
}

let items = try? JSONDecoder().decode(Items.self, from: jsonData)

struct Item: Codable {
    let id: Int
    let title: String
    let subtitle: String
    let body: String
    let date: Date
}

struct ItemList: Codable {
    let item: Item
}

let formatter = DateFormatter()
// 15/04/2013 11:48
formatter.dateFormat = "dd/MM/yyyy HH:mm"
formatter.locale = Locale(identifier: "en_US_POSIX")
// May want to include the timezone, since it's unspecified
// yet another pet hate

let jsonString = """
{
        "item":{
                "id":33,
                "title":"Article 5",
                "subtitle":"Tasing  123",
                "body":"Hello world " ,
                "date":"15/04/2013 11:48"
        }
}
"""
let jsonData = Data(jsonString.utf8)

do {
    let decoder = JSONDecoder()
    decoder.dateDecodingStrategy = .formatted(formatter)
    let items = try decoder.decode(ItemList.self, from: jsonData)
    items.item.id
    items.item.title
    items.item.subtitle
    items.item.body
    items.item.date
} catch let error {
    print(error)
}