javascript - 来自 Swift 转换的 json 字符串导致 JSON 解析失败

Question

我很好奇为什么我的 json 格式不正确。我试图添加一个数组字典，我弄明白了，我的 json 格式不正确，ACTIVE_CHATS 和 INACTIVE_CHATS 应该是我在 swift3 上由 .append(value) 创建的数组列表。但是在我对我的 react stringify 尝试 JSON.parse 之后，我得到了未捕获的 json 位置。我咨询了 android 团队，发现数组应该是 [] 而不是 () .. 我如何在 swift 中获得正确的 json 格式？

我现在的json格式是错误的

{
    "ACTIVE_CHATS" =     (
    );
    "INACTIVE_CHATS" =     (
                {
            "app_token" = "someapptoken";
            "channel_name" = "Channel-1";
            icon = "https://media.icon.com/icons/appicon-1.jpg";
            "last_message" = "some message";
            "time_since_last_message" = "2017-03-28 06:13:33 +0000";
            "unread_messages" = 3;
        }
    );
    "ALL_CHAT" =     {
        "app_token" = "someapptoken";
        "channel_name" = "Channel-2";
        icon = "https://media.icon.com/icons/appicon-2.jpg";
        "last_message" = "Some message";
        "time_since_last_message" = "2017-03-28 06:13:33 +0000";
        "unread_messages" = 3;
    };
}

我在 swift 中创建 json 时的代码

        var activearray = Array<Any>()
        var inactivearray = Array<Any>()
        var testdict = [String: Any]()
        var counter = 0
        for data in array {
            var listMessage : [Any?] = (Smooch.conversation()?.messages)!
            let unreadMsgCount = Smooch.conversation()?.unreadCount
            if listMessage.count == 0{
                continue
            }
            var iconUrl = ""
            var channelName = ""
            for msg in listMessage {
                let msgSkt = msg as! SKTMessage
                if (!msgSkt.isFromCurrentUser) {
                    iconUrl = (msg as! SKTMessage).avatarUrl!
                    channelName = (msg as! SKTMessage).name!
                    break
                }
            }
            let lastMsg : SKTMessage = listMessage[listMessage.count - 1] as! SKTMessage
            let lastMsgText : String = lastMsg.text!
            let epTime : Date = lastMsg.date!
            var dict = [String: Any]()
            dict = ["unread_messages":unreadMsgCount! as UInt,"icon":iconUrl,"channel_name":channelName,"last_message":lastMsgText,"time_since_last_message":epTime,"app_token":array[counter]]
            if counter == 0 {//put all
                testdict["ALL_CHAT"] = dict
            }else if counter > 0 && unreadMsgCount! > 0{// add active
                activearray.append(dict)
            }else{//add unactive
                inactivearray.append(dict)
            }
            counter += 1
        }

        testdict["ACTIVE_CHATS"] = activearray
        testdict["INACTIVE_CHATS"] = inactivearray

Answer 1

根据我们在评论中的讨论，您面临的问题是因为您输出了 NSDictionary 作为其字符串表示(或描述，如果您愿意)而不是实际输出有效的 JSON :)

你需要做的是将最终要转换为JSON格式的NSDictionary传递给JSONSerialization的data(withJSONObject:options:)方法。

在 Swift 中，代码看起来像这样:

do {
    let data = try JSONSerialization.data(withJSONObject:testdict, options: JSONSerialization.WritingOptions.prettyPrinted)
    let str = String(data:data, encoding: String.Encoding.utf8)
    print(str)
} catch {
    print("JSON error")
}