如何在Swift中解码嵌套JSON？

{
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York"
  }
}

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

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

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

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

do {
  let person = try JSONDecoder().decode(Person.self, from: jsonData)
  print(person.name) // 输出: John
  print(person.age) // 输出: 30
  print(person.address.street) // 输出: 123 Main St
  print(person.address.city) // 输出: New York
} catch {
  print("解码失败: \(error)")
}