将嵌套的JSON转换为Swift 4中的数据对象

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

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

// JSON字符串
let jsonString = """
{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York",
        "country": "USA"
    }
}
"""

// 将JSON字符串转换为数据对象
if let jsonData = jsonString.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
        print(person.address.country) // 输出: USA
    } catch {
        print("解码失败: \(error)")
    }
}