ios - swift 4 : JsonSerialization of object with optional values fails

Question

我有下一个结构:

struct PatientEntity{
    let patientId: String
    let firstName: String
    let lastName: String
    let gender: String
    let birthDate: String?
    let medicalDiagnosis: String?
    let therapyDiagnosis: String?
    let therapyGoals: String?
}

当我尝试将其序列化为 json 以便将其发送到服务器端时，由于 bithdate 上的 Optional word 而出现异常。我试图用下一个代码删除可选词，但没有成功:

if let bithDate = self.patientBithDateTextField.text {
    newPatient: PatientEntity = PatientEntity(
        patientId: self.patientIDTextField.text!, 
        firstName: self.patientNameTextField.text!,
        lastName: self.patientLastNameTextField.text!, 
        gender: self.getSelectedGender(), 
        birthDate: bithDate, 
        medicalDiagnosis: nil, 
        therapyDiagnosis: nil,
        therapyGoals: nil
    )

    ...call API
}

我的序列化代码是:

urlRequest.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: [])

其中参数值为:

case .createPatient(let newPatient):
            return ["patient": newPatient]

输出打印如下:

The parametrs in POST string are: ["patient": PatientEntity(patientId: "fff", firstName: "rrr", lastName: "rrrr", gender: "Female", birthDate: Optional("2018-05-23"), medicalDiagnosis: nil, therapyDiagnosis: nil, therapyGoals: nil)]

要传递对象序列化权需要做什么？

异常(exception)是:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid type in JSON write (_SwiftValue)'

Answer 1

如果您想检查有效的生日，可选绑定(bind)不是这样做的地方，我遇到了与您相同的错误。我建议您分离出从您的 View 中检索输入的代码。然后，测试 if bDate != nil 如下或类似。

struct PatientEntity: Encodable{
    let patientId: String
    let firstName: String
    let birthDate: String?
}

var bDate: String? = "12-12-12"
var pID: String? = "2346"
var fName: String? = "gldlfk"

if bDate != nil  {
    let newPatient: PatientEntity = PatientEntity(patientId: pID!, firstName: fName!, birthDate: bDate)
    let encoder = JSONEncoder()
    let data = try! encoder.encode(newPatient)
    print(String(data: data, encoding: .utf8)!)

}

输出:

{"firstName":"gldlfk","birthDate":"12-12-12","patientId":"2346"}