Question

我正在使用docodable协议，我遇到了这个错误：

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))

这是我输入错误的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套JSON数据结构，前两组在这种结构下工作正常，但上面的一个JSON数据使程序停止。我不知道我的代码会更新什么。我希望你能帮助我解决这个问题，TIA！

Answer 1

我只是将我的评论转换为答案以便更清晰。

问题在于config: [String: Config]?内部Params结构。从JSON中可以清楚地看出，您的密钥为config，而值为Config类型的对象而不是Dictionary类型。因此，请将config属性更改为config: Config?。

另请注意：当struct中的属性与JSON键相同时，您可以省略CodingKeys枚举（就像您对{{1}所做的那样结构）

额外注意事项：我在您的结构定义中看到了很多Properties个。请仅考虑您确实需要optional类型的情况。不要不必要地使用它们。

optional

如需进一步说明，我怀疑的是，您稍后会遇到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]? }类型的麻烦。它更像是我怀疑的[String: Properties]?属性。

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"
  }
}

抱歉我的坏！我的密钥配置错误的对象类型。而是config = [String：Config？]更改为config = Config？归功于@nayem

期望解码Dictionary <string，any =“”>但是找到了一个字符串/数据

2 个答案: