如何使用NSUserDefaults在Swift中存儲自定義類的數組？

Question

我有一個名爲Person的自定義類，它在輸入信息時存儲有關某人的各種屬性。

class Person { 

    // Person dictionary variable 
    var name: String? 
    var age: String? 
    var html_url: String? 

    init(json: NSDictionary) { // Dictionary object 
     self.name = json["name"] as? String 
     self.age = json["age"] as? String 
     self.html_url = json["html_url"] as? String // Location of the JSON file 
    } 
} 

一旦字典被創建，它就會被放入一個數組中。點按按鈕時，我在將數組保存到NSUserDefaults時遇到問題。

personArray.append(newPerson) // newPerson = dictionary of attributes 


NSUserDefaults.standardUserDefaults().setObject(personArray, forKey: "personArray") 
     NSUserDefaults.standardUserDefaults().synchronize() 

我有看How to store custom objects in NSUserDefaults和Saving custom SWIFT class with NSCoding to UserDefaults，但我有沒有運氣和我發現它很難理解。

我的時候，我只是嘗試保存到NSUserDefaults的，我聽說了以下內容：

Attempt to set a non-property-list object (
    "PersonApp.Person" 
) as an NSUserDefaults/CFPreferences value for key personArray 

會有人能夠幫助我通過實際NSUserDefaults的保存自定義對象（自定義詞典）的陣列？

Answer 1

你的Person類應該是這樣的：

斯威夫特3：

class Person : NSObject, NSCoding{ 

    // Person dictionary variable 
    var name: String? 
    var age: String? 
    var html_url: String? 

    init(json: NSDictionary) { // Dictionary object 
     self.name = json["name"] as? String 
     self.age = json["age"] as? String 
     self.html_url = json["html_url"] as? String // Location of the JSON file 
    } 

    required init?(coder aDecoder: NSCoder) { 

     self.name = aDecoder.decodeObjectForKey("name") as? String; 
     self.age = aDecoder.decodeObjectForKey("age") as? String; 
     self.html_url = aDecoder.decodeObjectForKey("html") as? String; 
    } 

    func encodeWithCoder(aCoder: NSCoder) { 
     aCoder.encodeObject(self.name, forKey: "name"); 
     aCoder.encodeObject(self.age, forKey: "age"); 
     aCoder.encodeObject(self.html_url, forKey: "html"); 
    } 
} 

在這裏，你必須保存和檢索從NSUserDefaults的數組的一個例子：

let p = Person() 
p.name = "person1" 
p.age = "12" 
p.html_url = "www.google.ro" 

let p2 = Person() 
p2.name = "person2" 
p2.age = "11" 
p2.html_url = "www.google.ro" 

let array = [p, p2] 

let userDefaults = NSUserDefaults.standardUserDefaults() 
userDefaults.setValue(NSKeyedArchiver.archivedDataWithRootObject(array), forKey: "persons") 
userDefaults.synchronize() 

let array : [Person] 
array = NSKeyedUnarchiver.unarchiveObjectWithData(userDefaults.objectForKey("persons") as! NSData) as! [Person] 
print("\(array[0].name)\(array[1].name)") 

斯威夫特4：

class Person : NSObject, NSCoding{ 

    // Person dictionary variable 
    var name: String? 
    var age: String? 
    var html_url: String? 

    init(json: NSDictionary) { // Dictionary object 
     self.name = json["name"] as? String 
     self.age = json["age"] as? String 
     self.html_url = json["html_url"] as? String // Location of the JSON file 
    } 

    required init?(coder aDecoder: NSCoder) { 
     self.name = aDecoder.decodeObject(forKey: "name") as? String; 
     self.age = aDecoder.decodeObject(forKey: "age") as? String; 
     self.html_url = aDecoder.decodeObject(forKey: "html") as? String; 
    } 

    func encode(with aCoder: NSCoder) { 
     aCoder.encode(self.name, forKey: "name"); 
     aCoder.encode(self.age, forKey: "age"); 
     aCoder.encode(self.html_url, forKey: "html"); 
    } 
} 

Answer 2

您需要執行NSCoding協議才能將自定義對象存儲到NSUserDefaults中。看看這個例子http://nshipster.com/nscoding/

Answer 3

夫特4

• 確認可編碼協議到類
• 序列化（數據）使用對象JsonEncoder類
• 現在將數據保存到userDefaults

看到這個答案，以獲得清晰的想法 Save Array of Custom Swift object to userDefaults