swift - Swift Codable:嵌套字典未读取

我得到了一些类似这样的json（这是伪的，不是所有的键都在这里）：

{
    "absolute_magnitude_h" = "23.4";
    ...
    "close_approach_data" = (
                {
            "close_approach_date" = "1994-09-03";
            "epoch_date_close_approach" = 778575600000;
            "orbiting_body" = Earth;
}

我有一个具有此结构的对象：

struct NEOObj:Codable {

    var absoluteMagnitudeH:Float
    var designation:String
    var isPotentiallyHazardousAsteroid:Bool
    var isSentryObject:Bool
    var name:String
    var nasaJPLURL:String
    var neoReferenceID:String
    var closeApproachData:[NEOCloseApproachData] = [NEOCloseApproachData]()

    private enum CodingKeys: String, CodingKey {
        case absoluteMagnitudeH = "absolute_magnitude_h"
        case designation = "designation"
        case isPotentiallyHazardousAsteroid = "is_potentially_hazardous_asteroid"
        case isSentryObject = "is_sentry_object"
        case name = "name"
        case nasaJPLURL = "nasa_jpl_url"
        case neoReferenceID = "neo_reference_id"
    }

enum CloseApproachCodingKeys: String, CodingKey {
        case closeApproachDate = "close_approach_date"
        case epochDateCloseApproach = "epoch_date_close_approach"
        case orbitingBody = "orbiting_body"
    }

struct NEOCloseApproachData:Codable {

    var closeApproachDate:Date
    var epochDateCloseApproach:Date
    var orbitingBody:String

    enum CodingKeys: String, CodingKey {
        case closeApproachDate = "close_approach_date"
        case epochDateCloseApproach = "epoch_date_close_approach"
        case orbitingBody = "orbiting_body"
    }
}

在我的文件里有这样的代码：

if let arrNEOs = dictJSON["near_earth_objects"] as? Array<Any> {

    for thisNEODict in arrNEOs {

     do {
         let jsonData = try JSONSerialization.data(withJSONObject: thisNEODict, options: .prettyPrinted)
         let thisNEOObj = try? JSONDecoder().decode(NEOObj.self, from: jsonData)
         print(thisNEOObj!.closeApproachData)
     } catch {

     }
    }

   }

但是closeApproachData永远不会被填充。我做错什么了？

最佳答案

有很多事情需要改变才能起作用。
closeApproachData应该是[NEOCloseApproachData]类型。您的代码中没有包含CloseApproachCodingKeys，但可能不正确。
NEOObj.CodingKeys需要一个

case closeApproachData = "close_approach_data"

closeApproachData需要一个自定义解码器来处理NEOCloseApproachData和closeApproachDate的日期。由于JSON的格式各不相同（分别为String和Int），因此不能在epochDateCloseApproach上使用，因为它将应用于所有日期。

关于swift - Swift Codable:嵌套字典未读取，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/52861083/