swift中标准嵌套JSON的可解码包装器

struct Person: Codable {
    let name: String
    let age: Int
    let address: Address
}

struct Address: Codable {
    let street: String
    let city: String
    let country: String
}

let json = """
{
    "name": "John Doe",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "country": "USA"
    }
}
"""

let jsonData = json.data(using: .utf8)!
let decoder = JSONDecoder()

do {
    let person = try decoder.decode(Person.self, from: jsonData)
    print(person.name) // Output: John Doe
    print(person.address.city) // Output: New York
} catch {
    print("Error decoding JSON: \(error)")
}