Question

我正在尝试将自定义类的列表保存到用户默认值，并且我一直收到发送到实例的＆＃34;无法识别的选择器＆＃34;保存时出错。从用户默认值获取数组时没有问题。

这是我用来保存到用户默认值的代码。

let userDefaults = UserDefaults.standard
        userDefaults.set(NSKeyedArchiver.archivedData(withRootObject: visitors), forKey: "signedInUsers")
        userDefaults.synchronize()

访客是一组访客对象。

这是我的访客班。

class Visitor: NSObject {
    var name: String = ""
    var contactEmail: String = ""
    var company: String = ""
    var picture: UIImage = UIImage()
    var signature: UIImage = UIImage()
    var timeIn: String = ""
    var timeOut: String = ""
    var signedOut: Bool = false
    var otherQuestionsWithAnswers: [String] = []

    // MARK: NSCoding

    override init() {
        super.init()
    }

    init(name: String, contactEmail: String, company: String, picture: UIImage, signature: UIImage,timeIn: String,timeOut: String,signedOut: Bool,otherQuestionsWithAnswers: [String]) {
        self.name = name
        self.contactEmail = contactEmail
        self.company = company
        self.picture = picture
        self.signature = signature
        self.timeIn = timeIn
        self.timeOut = timeOut
        self.signedOut = signedOut
        self.otherQuestionsWithAnswers = otherQuestionsWithAnswers
    }

    required convenience init?(coder decoder: NSCoder) {
        guard let name = decoder.decodeObject(forKey: "name") as? String,
            let contactEmail = decoder.decodeObject(forKey: "contactEmail") as? String,
            let company = decoder.decodeObject(forKey: "company") as? String,
            let timeOut = decoder.decodeObject(forKey: "timeOut") as? String,
            let timeIn = decoder.decodeObject(forKey: "timeIn") as? String,
            let picture = decoder.decodeObject(forKey: "picture") as? UIImage,
            let signature = decoder.decodeObject(forKey: "signature") as? UIImage,
            let otherQuestionsWithAnswers = decoder.decodeObject(forKey: "otherQuestionsWithAnswers") as? [String],
            let signedOut = decoder.decodeObject(forKey: "signedOut") as? Bool
            else { return nil }

        self.init(
            name: name,
            contactEmail: contactEmail,
            company: company,
            picture: picture,
            signature: signature,
            timeIn: timeIn,
            timeOut: timeOut,
            signedOut: signedOut,
            otherQuestionsWithAnswers: otherQuestionsWithAnswers
        )
    }

    func encodeWithCoder(coder: NSCoder) {
        coder.encode(name, forKey: "name")
        coder.encode(contactEmail, forKey: "contactEmail")
        coder.encode(company, forKey: "company")
        coder.encode(picture, forKey: "picture")
        coder.encode(signature, forKey: "signature")
        coder.encode(timeIn, forKey: "timeIn")
        coder.encode(timeOut, forKey: "timeOut")
        coder.encode(signedOut, forKey: "signedOut")
        coder.encode(otherQuestionsWithAnswers, forKey: "otherQuestionsWithAnswers")
    }
}

感谢帮助表示赞赏。

编辑：

将类更改为固定它。

import Foundation
import UIKit

// a question that the user has to answer
class Visitor: NSObject, NSCoding {
    var name: String = ""
    var contactEmail: String = ""
    var company: String = ""
    var picture: UIImage = UIImage()
    var signature: UIImage = UIImage()
    var timeIn: String = ""
    var timeOut: String = ""
    var signedOut: Bool = false
    var otherQuestionsWithAnswers: [String] = []

    // MARK: NSCoding

    override init() {
        super.init()
    }

    init(name: String, contactEmail: String, company: String, picture: UIImage, signature: UIImage,timeIn: String,timeOut: String,signedOut: Bool,otherQuestionsWithAnswers: [String]) {
        self.name = name
        self.contactEmail = contactEmail
        self.company = company
        self.picture = picture
        self.signature = signature
        self.timeIn = timeIn
        self.timeOut = timeOut
        self.signedOut = signedOut
        self.otherQuestionsWithAnswers = otherQuestionsWithAnswers
    }

    required init(coder decoder: NSCoder) {
        name = decoder.decodeObject(forKey: "name") as! String
        contactEmail = decoder.decodeObject(forKey: "contactEmail") as! String
        company = decoder.decodeObject(forKey: "company") as! String
        timeOut = decoder.decodeObject(forKey: "timeOut") as! String
        timeIn = decoder.decodeObject(forKey: "timeIn") as! String
        if let pictureTest = decoder.decodeObject(forKey: "picture") as? UIImage {
            picture = pictureTest
        } else {
            picture = UIImage()
        }
        if let sigTest = decoder.decodeObject(forKey: "picture") as? UIImage {
            signature = sigTest
        } else {
            signature = UIImage()
        }
        otherQuestionsWithAnswers = decoder.decodeObject(forKey: "otherQuestionsWithAnswers") as! [String]
        signedOut = decoder.decodeBool(forKey: "signedOut")
    }

    public func encode(with aCoder: NSCoder) {
        aCoder.encode(name, forKey: "name")
        aCoder.encode(contactEmail, forKey: "contactEmail")
        aCoder.encode(company, forKey: "company")
        aCoder.encode(picture, forKey: "picture")
        aCoder.encode(signature, forKey: "signature")
        aCoder.encode(timeIn, forKey: "timeIn")
        aCoder.encode(timeOut, forKey: "timeOut")
        aCoder.encode(signedOut, forKey: "signedOut")
        aCoder.encode(otherQuestionsWithAnswers, forKey: "otherQuestionsWithAnswers")
    }
}

Answer 1

您用于编码的功能不正确，必须是func encode(with aCoder: NSCoder){}而不是func encodeWithCoder(coder: NSCoder) {}，因此请更改并按预期工作

public func encode(with aCoder: NSCoder) {
    aCoder.encode(name, forKey: "name")
    aCoder.encode(contactEmail, forKey: "contactEmail")
    aCoder.encode(company, forKey: "company")
    aCoder.encode(picture, forKey: "picture")
    aCoder.encode(signature, forKey: "signature")
    aCoder.encode(timeIn, forKey: "timeIn")
    aCoder.encode(timeOut, forKey: "timeOut")
    aCoder.encode(signedOut, forKey: "signedOut")
    aCoder.encode(otherQuestionsWithAnswers, forKey: "otherQuestionsWithAnswers")
}

希望这有帮助

Answer 2

您的Visitor类应首先从NSObject继承，然后继承NSCoding。如果没有NSCoding，则无法对自定义类进行编码和解码。这是我最近在项目中犯的错误，并且您的编码函数签名不正确。我相信这会解决这个问题。这是更正后的代码：

Swift 3版本： -

class Visitor: NSObject, NSCoding {
    var name: String = ""
    var contactEmail: String = ""
    var company: String = ""
    var picture: UIImage = UIImage()
    var signature: UIImage = UIImage()
    var timeIn: String = ""
    var timeOut: String = ""
    var signedOut: Bool = false
    var otherQuestionsWithAnswers: [String] = []

func encode(with aCoder: NSCoder) {
//... encode here
}

Swift 3 NSCoder无法识别的选择器发送到实例

2 个答案: