Question

我希望能够将Custom-struct保存到UserDefaults，但是为此，我需要将其保存为Codable。我尝试过这样的操作：

struct Wishlist: Codable {
var name: String
var image: UIImage
var wishData: [Wish]
var color: UIColor
var textColor: UIColor
var index: Int
}

但这给了我error：

类型“愿望清单”不符合协议“可解码”

这是我的Class Wish，也许是问题所在：

class Wish: NSObject {
public var wishName : String?
public var checkedStatus : Bool?
public var wishLink : String?
public var wishPrice : String?
public var wishNote : String?
public var wishImage : UIImage?

init(withWishName name: String, link: String, price: String, note: String, image: UIImage, checked: Bool) {
    super.init()
    wishName = name
    checkedStatus = checked
    wishLink = link
    wishPrice = price
    wishNote = note
    wishImage = image
}
}

我在这里做什么错了？

Answer 1

您需要使Wish采用Codable。

但是，由于UIImage和UIColor不是Codable，因此您必须按照Encoding and Decoding Custom Types所述手动实施它们：

struct Wishlist: Codable {
    var name: String
    var image: UIImage
    var wishes: [Wish]
    var color: UIColor
    var textColor: UIColor
    var index: Int

    enum CodingKeys: String, CodingKey {
        case name, image, wishData, color, textColor, index
    }

    init(name: String, image: UIImage, wishes: [Wish], color: UIColor, textColor: UIColor, index: Int) {
        self.name = name
        self.image = image
        self.wishes = wishes
        self.color = color
        self.textColor = textColor
        self.index = index
    }

    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)

        name = try values.decode(String.self, forKey: .name)
        wishes = try values.decode([Wish].self, forKey: .wishData)
        color = try values.decode(Color.self, forKey: .color).uiColor
        textColor = try values.decode(Color.self, forKey: .textColor).uiColor
        index = try values.decode(Int.self, forKey: .index)

        let data = try values.decode(Data.self, forKey: .image)
        guard let image = UIImage(data: data) else {
            throw DecodingError.dataCorruptedError(forKey: .image, in: values, debugDescription: "Invalid image data")
        }
        self.image = image
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)

        try container.encode(name, forKey: .name)
        try container.encode(wishes, forKey: .wishData)
        try container.encode(Color(uiColor: color), forKey: .color)
        try container.encode(Color(uiColor: textColor), forKey: .textColor)
        try container.encode(index, forKey: .index)
        try container.encode(image.pngData(), forKey: .image)
    }

}

struct Wish: Codable {
    public var name: String
    public var checkedStatus: Bool
    public var link: String
    public var price: String
    public var note: String
    public var image: UIImage

    init(name: String, link: String, price: String, note: String, image: UIImage, checkedStatus: Bool) {
        self.name = name
        self.checkedStatus = checkedStatus
        self.link = link
        self.price = price
        self.note = note
        self.image = image
    }

    enum CodingKeys: String, CodingKey {
        case name, checkedStatus, link, price, note, image
    }

    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)

        name = try values.decode(String.self, forKey: .name)
        checkedStatus = try values.decode(Bool.self, forKey: .checkedStatus)
        link = try values.decode(String.self, forKey: .link)
        price = try values.decode(String.self, forKey: .price)
        note = try values.decode(String.self, forKey: .note)

        let data = try values.decode(Data.self, forKey: .image)
        guard let image = UIImage(data: data) else {
            throw DecodingError.dataCorruptedError(forKey: .image, in: values, debugDescription: "Invalid image data")
        }
        self.image = image
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)

        try container.encode(name, forKey: .name)
        try container.encode(checkedStatus, forKey: .checkedStatus)
        try container.encode(link, forKey: .link)
        try container.encode(price, forKey: .price)
        try container.encode(note, forKey: .note)
        try container.encode(image.pngData(), forKey: .image)
    }
}

我将其用作编码UIColor对象的便捷方法的地方：

struct Color: Codable {
    let red: CGFloat
    let green: CGFloat
    let blue: CGFloat
    let alpha: CGFloat

    init(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
    }

    init(uiColor: UIColor) {
        var red: CGFloat = 0
        var green: CGFloat = 0
        var blue: CGFloat = 0
        var alpha: CGFloat = 0

        uiColor.getRed(&red, green: &green, blue: &blue, alpha: &alpha)

        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
    }

    var uiColor: UIColor { UIColor(red: red, green: green, blue: blue, alpha: alpha) }
}

注意，我做了几个不相关的更改：

我同时做了这两个struct。除非必要，否则我不会介绍引用类型（更少的NSObject子类）。
我简化了一些属性名称。例如。在Wish中，通常不会在属性名称中使用wish前缀。除非实际上是Data，否则我也不会在属性名称中使用“数据”。
我更新了init方法以使用标准命名约定。

Answer 2

在您的情况下，应添加private void rellenarArrendatarioComboBox(ArrayList<Arrendatario> arrendatarios) { DefaultComboBoxModel model = new DefaultComboBoxModel(); model.addElement(new Arrendatario(" -- Seleccione un arrendatario --")); for (Arrendatario arrendatario : arrendatarios) { model.addElement(arrendatario); } ArrendatarioComboBox.setModel(model); }枚举，而不要使用CodingKeys或UIColor数据类型。我之前遇到过相同的错误，但是后来我意识到CodingKey与该结构不匹配，也没有UIImage数据类型。只需将数据类型更改为自定义可编码对象即可。

错误的示例：

non-codable

从示例中我们知道public struct DtClip: Codable { // MARK: Properties public var video: String? public var preview: String? public var clip: String? public var trailer: Any? enum CodingKeys: String, CodingKey { case video = "video" case preview = "preview" case clip = "clip" } }不在trailer中。您应该将所有道具添加到codingKeys中。并且CodingKeys数据类型应更改为可编码数据类型，例如Any，String或Int（自定义可编码数据类型）。下面是正确的示例：

Trailer

Answer 3

您的班级也希望实现Codable协议

Answer 4

UIImage不符合Codable。您可以先将其转换为Base64，然后将那个存储在UserDefaults中。

自定义结构：类型不符合协议“可解码”

4 个答案: