如何使用NSUserDefaults在Swift中存储自定义类的数组？ [英] How to use NSUserDefaults to store an array of custom classes in Swift?

问题描述

我有一个名为 Person 的自定义类，它在输入信息时存储有关某人的各种属性。

I have a custom class called Person that stores various attributes about someone when they enter information.

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
    }
}

一旦字典创建后，它将被放入一个数组中。点击按钮时，我在将数组保存到 NSUserDefaults 时遇到问题。

Once the dictionary is created, it is then placed into an array. I am having problems saving the array into NSUserDefaults when a button is tapped.

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


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

我看过如何在NSUserDefaults中存储自定义对象和使用NSCoding将自定义SWIFT类保存到UserDefaults 但我没有运气，并且发现它很难理解。

I have had a look at How to store custom objects in NSUserDefaults and Saving custom SWIFT class with NSCoding to UserDefaults but I have had no luck and am finding it hard to understand.

当我只是尝试保存到NSUserDefaults时，我被告知以下内容：

I when I simply try to save into NSUserDefaults, I am told the following:

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

有人能帮我实际保存一组自定义对象（自定义词典）通过NSUserDefaults？

Would anyone be able to help me actually save an array of custom objects (custom dictionaries) via NSUserDefaults?

推荐答案

您的Person类应如下所示：

Your Person class should look like this:

Swift 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");
    }
}

这里有一个保存和检索的示例来自NSUserDefaults的数组：

And here you have an example of saving and retrieving the array from NSUserDefaults:

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)")

Swift 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");
    }
}

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