ios - swift4 Realm 模型 - 覆盖描述(等效于 java toString())

Question

我有一个问题。我正在尝试覆盖描述方法以根据需要打印引用值。我读到这等同于 Java toString() 方法(我是 swift 的新手)

问题是，它不起作用，我找不到任何解决方案。我完全按照示例中的方式进行了操作。我做错了什么？

这是我的代码:

import Foundation
import RealmSwift

@objcMembers class Patient: Object{

    //toString()
    override var description: String{
        return "Patient: Ref nr: \(self.referenceNumber), First name: \(self.firstName), Surname: \(self.surname) Email:  \(self.email)"
    }

    var patientId:Int{
        return self.patientId
    }
    dynamic var referenceNumber: String = ""
    dynamic var firstName:String = ""
    dynamic var surname:String = ""
    dynamic var email:String = ""

    convenience init(referenceNumber:String, firstName:String, surname:String, email:String) {
        self.init()
        self.referenceNumber = referenceNumber
        self.firstName = firstName
        self.surname = surname
        self.email = email
    }

现在，每当我尝试打印时:(我发布了更多代码以防 smith 错误早于打印)

var patient: Results<Patient>!

override func viewDidLoad() {
    super.viewDidLoad();

    let realm = RealmService.shared.realm
    let patient = realm.objects(Patient.self) //tocheck: can I get only one element from Realm and set to store only 1 element?

    //HERE IT GOES WRONG
    print(patient) //case 1
    print(patient.description) //case 2
}

它在控制台中打印:(在两种情况下相同)

Results<Patient> <0x7fccaaf03b90> (
    [0] Patient {
        referenceNumber = 231321;
        firstName = James;
        surname = Rodriguez;
        email = jr@lalalla.pl;
    }
)

为什么？

Answer 1

因为您正在尝试打印一个数组。试试 patient[0].description(patient 不是最好的名字，也许是 patients？)。