期望解码字典<字符串，任何>但找到了字符串/数据

Question

我正在使用可记录的协议，但遇到了此错误：

typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [MakeApp_v2.Params.(CodingKeys in _244BBB2F32A8C5CF3DB84B0C6A94B232).config, Swift._DictionaryCodingKey(stringValue: "table", intValue: nil)], debugDescription: "Expected to decode Dictionary<String, Any> but found a string/data instead.", underlyingError: nil))

这是我发现错误的 JSON

{
  "callBackID" : "add1867f-6005-189c-bbb4-ff53202b0697",
  "config" : {
    "description" : "Welcome Page",
    "show-bottom-bar" : "",
    "css-page-align" : "",
    "footer" : { "show" : "", "object" : "bottom-bar" },
    "pageStyle" : "full-page",
    "sourceType" : "list",
    "title" : "Welcome Page",
    "header" : { "show" : true, "hide" : false, "object" : "top-bar" },
    "columns" : {},
    "objects" : {},
    "showtabs" : true,
    "slides" : [{"title" : "first section","map" : ["open"]}],
    "table" : "",
    "show-top-bar" : true,
    "style_max-width" : "",
    "slideType" : "slide"
  },
  "method" : 106,
  "parName" : "A1519614709427",
  "formid" : "1"
}

我的结构

struct Params: Decodable {
  let callBackID: String, method: Int, parName: String, pageID: String?, table: String?, fields: [String: Properties]?, imageid: String?, imagetable: String?, config: [String: Config]?, appTemplate: String?, appName: String?, values: Properties?, columns: [String: Properties]?, filter: [String: Properties]?
  private enum CodingKeys: String, CodingKey {
    case callBackID = "callBackID", method = "method", parName = "parName", pageID = "pageID", table = "table", fields = "fields", imageid = "imageid", imagetable = "imagetable", config = "config", appTemplate = "appTemplate", appName = "appName", values = "values", columns = "columns", filter = "filter"
  }
}
struct Properties: Decodable {
  let source: String?, type: String?, rec_id: String?, name: String?, value: String?
}
struct Config: Decodable {
  let table: String?
  private enum CodingKeys: String, CodingKey {
    case table = "table"
  }
}

获取 JSON 数据

var param: Params?
do {
    let jsonData = try JSONSerialization.data(withJSONObject: message.body, options: .prettyPrinted)
    print(String(data: jsonData, encoding: .utf8)!)
    param = try JSONDecoder().decode(Params.self, from: jsonData)
    print(param!)
} catch {
    print(error)
}
methods(param: param!)
print(methods)
}
func methods(param: Params) -> String { return "some string" }

我有 3 组 JSON 数据结构，前两组使用此结构可以正常工作，但上面的一组 JSON 数据使程序停止。我不确定在我的代码上更新什么。我希望你能帮助我解决这个问题，TIA！

Answer 1

好吧，

为了更清楚起见，我只是将我的评论转换为答案。

问题是您在结构Params内部config: [String: Config]?。从 JSON 中可以清楚地看出您的键是config的，并且该值将是Config类型对象，而不是Dictionary类型。因此，将配置属性更改为 config: Config? 。

另一个注意事项：当struct中的属性与 JSON 键相同时，您可以省略CodingKeys枚举(就像您对 Properties 结构所做的那样(

额外说明：我在您的结构定义中看到了很多optional。请仅在您真正需要optional类型时考虑情况。不要只是不必要地使用它们。

struct Params: Decodable {
    let callBackID: String
    let method: Int
    let parName: String
    let pageID: String?
    let table: String?
    let fields: [String: Properties]?
    let imageid: String?
    let imagetable: String?
    let config: Config?
    let appTemplate: String?
    let appName: String?
    let values: Properties?
    let columns: [String: Properties]?
    let filter: [String: Properties]?
}

对于进一步的说明，我怀疑更多的是，您以后也会遇到[String: Properties]?类型的麻烦。我怀疑这更像是config财产。

Answer 2

struct Params: Decodable {
  let callBackID: String, method: Int, parName: String, pageID: String?, table: String?, fields: [String: Properties]?, imageid: String?, imagetable: String?, config: Config?, appTemplate: String?, appName: String?, values: Properties?, columns: [String: Properties]?, filter: [String: Properties]?
  private enum CodingKeys: String, CodingKey {
    case callBackID = "callBackID", method = "method", parName = "parName", pageID = "pageID", table = "table", fields = "fields", imageid = "imageid", imagetable = "imagetable", config = "config", appTemplate = "appTemplate", appName = "appName", values = "values", columns = "columns", filter = "filter"
  }
}
struct Properties: Decodable {
  let source: String?, type: String?, rec_id: String?, name: String?, value: String?
}
struct Config: Decodable {
  let table: String?
  private enum CodingKeys: String, CodingKey {
    case table = "table"
  }
}

对不起，我的错！ 我的密钥配置的对象类型错误。 相反，配置 = [字符串：配置？] 更改为 配置 = 配置？ 信用到@nayem