如何从模型数据 Swift 创建 JSON 字符串？ [关闭]

Question

如何从其他模型数据创建 JSON 字符串？

我希望从数据中创建 json 字符串，但没有成功。

我在数组中得到结果，然后我使用 For Loop 传递给 AppointmentDownloadModel 以创建 json。

如何传递数据 AppointmentDownloadModel 并创建 JSON 字符串。

数据接收模型：

struct ResponseData: Codable {

    let appointments : [Appointment]?
}


let decoder = JSONDecoder()
let response = try decoder.decode(ResponseData.self, from: result! as! Data)
self.appData = response.appointments
for everyApp in self.appData! {

}

想要将响应数据传递给这个模型：

struct AppointmentDownloadModel: Codable{
    var appointmentModel: Appointment
    var progress: Int = 0
    var failedList: [Int: String] = [:]
    var isFinished: Bool = false
}

最后需要创建这个字符串：

{"appointmentModel":{"appointmentHour":"12:00","backgroundColorDark":"#556f7b","backgroundColorLight":"#cfd8dc","controlHour":"","date":"2020-06-01T12:00:00","heatingType":"b","id":15469622,"isProjectManual":false,"projectFirmName":"Miray Doğalgaz (Erhan Şahin)","projectName":"KÖKSAL ÇOŞKUN-+D1+D3+D5","projectType":"k","subTitle":"18137 902179436-18137-408352"},"failedResourceList":[],"isFinished":false,"progress":0}

Answer 1

下面将解码 json 示例并创建新的 AppointmentDownloadModel 对象，然后将其编码为 Data（并转换为字符串）

var models = [AppointmentDownloadModel]()

let decoder = JSONDecoder()
do {
    let response = try decoder.decode(ResponseData.self, from: data)
    if let appointments = response.appointments {
        models = appointments.map { AppointmentDownloadModel(appointmentModel: $0)}
    }
} catch {
    print(error)
}

let encoder = JSONEncoder()
do {
    let modelData = try encoder.encode(models)
    let jsonString = String(data: modelData, encoding: .utf8)
    print(jsonString)
} catch {
    print(error)
}