Swift:从JSON创建可解码模型，JSON包含字典中的字典

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

{
  "name": "John",
  "age": 30
}

let json = """
{
  "name": "John",
  "age": 30
}
"""

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
} catch {
    print("解码失败: \(error)")
}

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

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

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

let json = """
{
  "name": "John",
  "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.address.street) // 输出: 123 Main St
    print(person.address.city) // 输出: New York
} catch {
    print("解码失败: \(error)")
}