代码之家 › 专栏 › 技术社区 › Ibrahim Azhar Armar

Swift3-字典到JSON字符串

nsdictionary swift3 swift json

-2

Ibrahim Azhar Armar · 技术社区 · 7 年前

我有以下类(在实际聊天中,类是NSManagedObject,为了清晰起见,我对其进行了简化)

import Foundation
class Chat: Hashable {

    public var id: Int32?
    public var token: String?
    public var title: String?

    var hashValue: Int {
        return ObjectIdentifier(self).hashValue
    }

    static func ==(lhs: Chat, rhs: Chat) -> Bool {
        return ObjectIdentifier(lhs) == ObjectIdentifier(rhs)
    }
}

Set 。因此我尝试复制相同的类型)

let chat1 = Chat()
chat1.id = 1
chat1.token = "aU7nanPu"
chat1.title  = "Chat Title 1"

let chat2 = Chat()
chat2.id = 2
chat2.token = "948dfjh4"
chat2.title  = "Chat Title 2"

let chat3 = Chat()
chat3.id = 3
chat3.token = "1321sjadb"
chat3.title  = "Chat Title 3"

var chats = Set<Chat>()
chats.insert(chat1)
chats.insert(chat2)
chats.insert(chat3)

现在,我想将数据转换为JSON,将其发送到服务器进行处理。(我将Alamofire与SwiftyJSON一起使用)因此我首先使用以下代码将其转换为Dictionary。

var resultDict = [Int:Any]()
for (index, chat) in chats.enumerated() {
    var params = ["id" : chat.id!, "token": chat.token!, "title": chat.title!] as [String : Any]
    resultDict[index] = params
}

这给了我以下输出

[2:[“id”:3,“token”:“1321sjadb”,“title”:“Chat title 3”],0: “token”:“948dfjh4”,“title”:“聊天标题2”]]

let jsonData = try! JSONSerialization.data(withJSONObject: resultDict, options: .prettyPrinted)

这给了我一个错误,它说 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid (non-string) key in JSON dictionary

我的问题是,我如何转换 resultDict

PS:如果有人想玩代码,这是小提琴: https://swift.sandbox.bluemix.net/#/repl/597833e605543472066ad11e

2 回复 | 直到 7 年前

Josh Hamet 7 年前

我认为resultDict的键必须是String类型。

 let resultDict = [String:Any]()

在将索引添加到字典之前,只需将其转换为字符串

 resultDict[String(index)] = params

BangOperator 7 年前

你的 resultDict 属于类型 [Int:Any] strings https://developer.apple.com/documentation/foundation/jsonserialization/1413636-data 了解更多详细信息。

试试这个

var resultDict = [String:Any]()
for (index, chat) in chats.enumerated() {
    var params = ["id" : chat.id!, "token": chat.token!, "title": chat.title!] as [String : Any]
    resultDict["\(index)"] = params
}