如何将带有对象的数组保存到UserDefaults

Question

My Object符合新的Swift 4 Codeable协议.如何保存这些对象的数组UserDefaults？

struct MyObject: Codeable {
    var name: String
    var something: [String]
}

myObjectsArray = [MyObject]() // filled with objects
UserDefaults.standard.set(myObjectsArray, forKey: "user_filters")

错误

由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'尝试插入非属性列表对象

Answer 1

哇,我得到了它的工作:

这是使用Objects 保存的Swift 4语法:ArrayCodeable

我的解决方案是将其编码为JSON对象并保存:

static var getAllObjects: [MyObject] {
      let defaultObject = MyObject(name: "My Object Name")
      if let objects = UserDefaults.standard.value(forKey: "user_objects") as? Data {
         let decoder = JSONDecoder()
         if let objectsDecoded = try? decoder.decode(Array.self, from: objects) as [MyObject] {
            return objectsDecoded
         } else {
            return [defaultObject]
         }
      } else {
         return [defaultObject]
      }
   }

 static func saveAllObjects(allObjects: [MyObject]) {
      let encoder = JSONEncoder()
      if let encoded = try? encoder.encode(allObjects){
         UserDefaults.standard.set(encoded, forKey: "user_objects")
      }
 }