我想将 CollegeRequest 类型转换为字典或数据,以便在请求POST-API时将其发送到服务器。
这是我的 CollegeRequest 类型:
struct CollegeRequest: Codable {
struct Student: Codable {
var id: Int
var name: String
}
var student: Student
var date: Date
}
转换后(连同层次结构键),应该是这样的:
{
"student.id": 3,
"student.name": "Raj",
"date": "2019-10-31T13:59:00+00:00"
}
我该如何实现?
答案 0 :(得分:1)
使用Encodable protocol对您的皮肤结构类型CollegeRequest进行编码。您的结构需要手动编码
如果您的Swift类型的结构与其结构不同 编码形式,您可以提供Encodable和 可解码定义自己的编码和解码逻辑。 source
要将 CollegeRequest 编码为数据类型,请使用JSONEncoder。将数据类型的实例编码为JSON对象的对象。
关于日期存储属性,您必须使用 JSONEncoder.DateEncodingStrategy.formatted(_:) ,这是将格式设置推迟到提供的日期格式程序的策略。
struct CollegeRequest: Codable {
struct Student: Codable {
var id: Int
var name: String
}
var student: Student
var date: Date
enum CodingKeys: String, CodingKey {
case studentId = "student.id"
case studentName = "student.name"
case date
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(student.id, forKey: .studentId)
try container.encode(student.name, forKey: .studentName)
try container.encode(date, forKey: .date)
}
init(student: CollegeRequest.Student, date: Date) {
self.student = student
self.date = date
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
let studentId = try values.decode(Int.self, forKey: .studentId)
let studentName = try values.decode(String.self, forKey: .studentName)
student = Student(id: studentId, name: studentName)
date = try values.decode(Date.self, forKey: .date)
}
}
用法
let request = CollegeRequest(student: CollegeRequest.Student(id: 1, name: "John"), date: Date())
let jsonEncoder = JSONEncoder()
let df = { let df = DateFormatter(); df.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"; return df }() as DateFormatter
jsonEncoder.dateEncodingStrategy = .formatted(df)
let a: Data? = try? jsonEncoder.encode(request)