Question

我遵循按预期工作的Codable结构

struct VideoAlbum: Codable {


 let id, image: String?
 let video, mediaType: JSONNull?
 let type, deleted, createdOn: String?
 let modifiedOn: JSONNull?

  enum CodingKeys: String, CodingKey {
    case id, image, video
    case mediaType = "media_type"
    case type, deleted
    case createdOn = "created_on"
    case modifiedOn = "modified_on"
 }

}

// MARK：编码/解码助手

class JSONNull: Codable {
public init() {}

public required init(from decoder: Decoder) throws {
    let container = try decoder.singleValueContainer()
    if !container.decodeNil() {
        throw DecodingError.typeMismatch(JSONNull.self, DecodingError.Context(codingPath: decoder.codingPath, debugDescription: "Wrong type for JSONNull"))
    }
}

public func encode(to encoder: Encoder) throws {
    var container = encoder.singleValueContainer()
    try container.encodeNil()
}
}

现在我需要添加自定义属性，而不是来自API 来跟踪视频位置，所以我对其进行了修改

struct VideoAlbum: Codable {

    let id, image: String?
    let video, mediaType: JSONNull?
    let type, deleted, createdOn: String?
    let modifiedOn: JSONNull?

    var isPlaying:Bool? // CUSOTM PROPERTY 
    var currentTime:CMTime? // CUSOTM PROPERTY 
    var timeObserver:Any? // CUSOTM PROPERTY  
    var pausedByUser:Bool? // CUSOTM PROPERTY 

    enum CodingKeys: String, CodingKey {
        case id, image, video
        case mediaType = "media_type"
        case type, deleted
        case createdOn = "created_on"
        case modifiedOn = "modified_on"

        case isPlaying,pausedByUser
        case currentTime
        case timeObserver
    }
}

然而它正在显示

错误类型'VideoAlbum'不符合协议'可解码'

有没有办法不使用某些属性作为Codable？

我知道问题是 CMTime 和任何我不知道如何解决它

我搜索了很多问题，但是所有属性都来自API，没有找到自定义属性任何人都建议我任何解决方案或替代方式？

Answer 1

如果您不想解码这4个属性，请不要将它们包含在CodingKeys中：

struct VideoAlbum: Codable {

    let id, image: String?
    let video, mediaType: JSONNull?
    let type, deleted, createdOn: String?
    let modifiedOn: JSONNull?

    var isPlaying: Bool? = nil
    var currentTime: CMTime? = nil
    var timeObserver: Any? = nil
    var pausedByUser: Bool? = nil

    enum CodingKeys: String, CodingKey {
        // include only those that you want to decode/encode
        case id, image, video
        case mediaType = "media_type"
        case type, deleted
        case createdOn = "created_on"
        case modifiedOn = "modified_on"
    }
}

Answer 2

首先从struct类型更改为class。添加不符合Codable协议的父类，例如VideoAlbumStatus并添加这些自定义属性。现在只继承父类。

class VideoAlbumStatus {
    var isPlaying:Bool? // CUSOTM PROPERTY 
    var currentTime:CMTime? // CUSOTM PROPERTY 
    var timeObserver:Any? // CUSOTM PROPERTY  
    var pausedByUser:Bool? // CUSOTM PROPERTY 
}

class VideoAlbum: VideoAlbumStatus, Codable {

    let id, image: String?
    let video, mediaType: JSONNull?
    let type, deleted, createdOn: String?
    let modifiedOn: JSONNull?

    enum CodingKeys: String, CodingKey {
        case id, image, video
        case mediaType = "media_type"
        case type, deleted
        case createdOn = "created_on"
        case modifiedOn = "modified_on"
    }

    //TO DO 
    // init() for VideoAlbum class

}

如何在Codable结构中添加自定义瞬态属性

2 个答案: