在JSONserialization中使用Structs解码Swift中的嵌套JSON数组和字典

{
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Main St",
    "city": "New York"
  },
  "friends": [
    {
      "name": "Alice",
      "age": 28
    },
    {
      "name": "Bob",
      "age": 30
    }
  ]
}

struct Person: Codable {
  let name: String
  let age: Int
  let address: Address
  let friends: [Friend]
}

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

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

let json = """
{
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Main St",
    "city": "New York"
  },
  "friends": [
    {
      "name": "Alice",
      "age": 28
    },
    {
      "name": "Bob",
      "age": 30
    }
  ]
}
"""

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

do {
  let person = try decoder.decode(Person.self, from: jsonData)
  print(person.name) // Output: John
  print(person.address.city) // Output: New York
  print(person.friends[0].name) // Output: Alice
} catch {
  print("Error decoding JSON: \(error)")
}