Question

我有一个自定义类，用于映射，如下所示。

class UserSaved {

    var Id         : String
    var UserName   : String
    var profileURL      : String
    var fullNameUser    : String

    func encode(with aCoder: NSCoder) {
        aCoder.encode(self.Id, forKey: "Id")
        aCoder.encode(self.UserName, forKey: "UserName")
        aCoder.encode(self.profileURL, forKey: "profileURL")
        aCoder.encode(self.fullNameUser, forKey: "fullNameUser")
    }

    required init?(coder aDecoder: NSCoder) {
        self.Id = aDecoder.decodeObject(forKey: "Id") as! String
        self.UserName = aDecoder.decodeObject(forKey: "UserName") as! String
        self.profileURL = aDecoder.decodeObject(forKey: "profileURL") as! String
        self.fullNameUser = aDecoder.decodeObject(forKey: "fullNameUser") as! String

       // self.init(my_id: self.Id, my_username: self.UserName, profile_url: self.profileURL, full_name: self.fullNameUser)
    }

    init(my_id: String, my_username: String, profile_url: String, full_name : String) {
        self.Id = my_id
        self.UserName = my_username
        self.profileURL = profile_url
        self.fullNameUser = full_name
    }
}

现在我将不同的模型对象添加到两个不同的数组中，如下所示，在这两个数组下面可能有一些共同的条目

//////array 1
let arrayTemp = dic.value(forKey: "data") as! NSArray
for i in 0..<arrayTemp.count {
    let dic = arrayTemp.object(at: i) as! NSDictionary
    let strId = String(dic.value(forKey: "pk") as! Int)
    let instaName = dic.value(forKey: "username") as! String
    let profileURL = dic.value(forKey: "profile_pic_url") as! String
    let fullName = dic.value(forKey: "full_name") as! String
    let person1 = UserSaved(insta_id: strId, insta_username: instaName,profile_url: profileURL,full_name: fullName)
    self.arr1.append(person1)
}

//////array 2
let arrayTemp = dic.value(forKey: "data") as! NSArray
for i in 0..<arrayTemp.count {
    let dic = arrayTemp.object(at: i) as! NSDictionary
    let strId = String(dic.value(forKey: "pk") as! Int)
    let instaName = dic.value(forKey: "username") as! String
    let profileURL = dic.value(forKey: "profile_pic_url") as! String
    let fullName = dic.value(forKey: "full_name") as! String
    let person2 = UserSaved(insta_id: strId, insta_username: instaName,profile_url: profileURL,full_name: fullName)
    self.arr2.append(person2)
}

现在，我正在使用下面的代码来操作上面的数组，效果很好

let setA = Set(self.arr1)
let setB = Set(self.arr2)
let inBothAAndB = setA.intersection(setB)
let inAButNotB = setA.subtracting(setB)
let inBButNotA = setB.subtracting(setA)

现在，当我尝试使用NSKeyedArchiver.archivedData将数组保存到用户默认设置中时。它给了我如下错误

2018-10-09 12:27:46.375587+0530 Insta_Analytics[12764:181604] *** NSForwarding: warning: object 0x6100000f0500 of class 
'Insta_Analytics.UserSaved' does not implement methodSignatureForSelector: -- trouble ahead
Unrecognized selector -[Insta_Analytics.UserSaved replacementObjectForKeyedArchiver:]
2018-10-09 12:27:46.376141+0530 Insta_Analytics[12764:181604] 
Unrecognized selector -[Insta_Analytics.UserSaved replacementObjectForKeyedArchiver:]

这是我将数组保存到userdefaults

中的代码

                        let encodedData = NSKeyedArchiver.archivedData(withRootObject: self.arr1)
                    UserDefaults.standard.set(encodedData, forKey: "arr_store")

现在，如果我更改自定义映射模型UserSaved，则继承自NSCoding和NSObject。可以，但是操作数据的时间不起作用

因此，一次只有一件事起作用。我想使用NSCoding保存数组，同时intersection和subtracting应该可以工作

Answer 1

要使用NSCoder，该类必须是NSObject的子类

class UserSaved : NSObject, NSCoding {

但是在您的情况下，我建议使用Codable并将符合性添加到Equatable

class UserSaved : Codable, Equatable {

删除init(coder和encode(with方法并序列化数据

let encodedData = PropertyListEncoder().encode(self.arr1)

并且不要在Swift中使用NSArray / NSDictionary。使用本机类型。并且不要使用value(forKey。使用密钥下标。

要解码数据，请使用

if let data = UserDefaults.standard.data(forKey: "arr_store") {
    do {
        let array = try PropertyListDecoder().decode([UserSaved].self, from: data)

    } catch { print(error) }
}

Answer 2

更新您的类UserSaved，以实现以下内容：

class UserSaved: NSObject, NSCoding, Hashable {
// ...

编码自定义对象的nsarray时无法使用Hashable

2 个答案: