arrays - 字典保存错误 "SwiftValue encodeWithCoder:]: unrecognized selector sent to instance"

Question

这个问题已经有答案了:

NSKeyedUnarchiver unarchiveObjectWithData:data returns non nil object but with nil properties [duplicate] (2 个回答)

How to save list of object in user Default? (6 个回答)

已关闭 3 年前。

我想保存字典，但我不断收到此错误消息:“SwiftValueencodeWithCoder:]:无法识别的选择器发送到实例”。这就是我尝试保存字典的方法:

func savePlaces(){
     let placesData = NSKeyedArchiver.archivedData(withRootObject: Resultaat?.reisdelen)
     UserDefaults.standard.set(placesData, forKey: "Reis")
}

我如何尝试加载字典:

var Reis = [reisdelen]()
func loadPlaces(){
     let placesData = UserDefaults.standard.object(forKey: "Reis") as? NSData

     if let placesData = placesData {
         let placesArray = NSKeyedUnarchiver.unarchiveObject(with: placesData as Data) as? [reisdelen]

         if let placesArray = placesArray {
             Reis = placesArray
             TableView.reloadData()
         }
     }
 }

我的结构:

struct reismogelijkheden: Decodable {
    let reisdelen: [reisdelen]?
    let reistijd: reistijd?
    let reistijdActueel : reistijdActueel?
    let aantalOverstappen: Int?
    let vertrektijd: String?
    let vertrektijdVertraging: vertrektijdVertraging?
    let aankomsttijd: String?
}

struct reisdelen: Decodable {
    let vervoerder: String?
    let richting: String?
    let treinnummer: String?
    let lijn: String?
    let stops: [stops]?
    let modaliteit: modaliteit?
    let travelTimeInMinutes: Int?
    let travelDistanceInMeters: Int?
}

Answer 1

您可以将模型保存到UserDefaults，如下所示:

• 首先，您应该创建模型的实例

• 然后您可以将模型保存到UserDefaults，例如:

  let encoder = JSONEncoder()
  if let encoded = try? encoder.encode(modelInstance) {
      let defaults = UserDefaults.standard
      defaults.set(encoded, forKey: "Reis")
  }
  

  您可以像这样从 UserDefaults 获取模型

  if let savedItem = defaults.object(forKey: "Reis") as? Data {
      let decoder = JSONDecoder()
      if let loadedItem = try? decoder.decode(YourModel.self, from: savedItem) {
          print(loadedItem)
      }
  }
  

我希望这是您试图找到的答案。

享受吧!