Question

我一直试图获得＆＃34; name＆＃34;来自使用

的回复

if let data = text.data(using: .utf8) {
    do {

        return try JSONSerialization.jsonObject(with: data, options: [])  as? [String : AnyObject]
    } catch {
        print(error.localizedDescription)
    }
}
return nil


for field in dict?["report_data"]?["name"] as? [Any] ?? [] {
    print(field)                   
}

没有成功。

回复是

可选（{＆＃34;内容＆＃34;：＆＃34;＆＃34;，＆＃34;主题＆＃34;：＆＃34;每周出席2018-05-14 - 2018-05-20＆＃34;，＆＃34;附件＆＃34;：＆＃34; []＆＃34;，＆＃34; report_data＆＃34;：＆＃34; [{\＆＃34; name \＆＃34; ：\＆＃34;总天数\＆＃34;，\＆＃34;值\＆＃34;：\＆＃34; 7 \＆＃34;}，{\＆＃34;名称\＆＃34 ;：\＆＃34;当前天数\＆＃34;，\＆＃34;值\＆＃34;：\＆＃34; 0 \＆＃34;}，{\＆＃34;名称\＆＃ 34;：\＆＃34;总小时数＆＃34;，\＆＃34;值\＆＃34;：\＆＃34; .0 \＆＃34;}，{\＆＃34;名称\ ＆＃34;：\＆＃34;平均时数\＆＃34;，\＆＃34;值\＆＃34;：\＆＃34; .0 \＆＃34;}，{\＆＃34; name \＆＃34;：\＆＃34;开始日期\＆＃34;，\＆＃34;值\＆＃34;：\＆＃34; 2018-05-14 \＆＃34;}，{ \＆＃34;名称＆＃34;：\＆＃34;结束日期\＆＃34;，\＆＃34;值\＆＃34;：\＆＃34; 2018-05-20 \＆＃ 34;}]＆＃34;，＆＃34; asset_reference＆＃34;：＆＃34; []＆＃34;，＆＃34; activity_reference＆＃34;：＆＃34; []＆＃34;，＆＃34; form_approval_field_reference＆＃34;：＆＃34; []＆＃34;}）

Plz帮我解决这个问题。

Answer 1

实际上，您收到的回复是[String : [[String : String]]]类型的字典。因此，value密钥的"report_data"是[[String : String]]类型的数组。

现在[[String : String]]实际上是一个字典数组。因此，数组的每个元素都是[String : String]的字典，其中包含"name"密钥。

let responseDictionary: [String : Any] = [ "report_data" : [
    ["name":"Total Days","value":"7"],
    ["name":"Present Days","value":"0"],
    ["name":"Total Hours","value":".0"],
    ["name":"Average Hours","value":".0"],
    ["name":"Start Date","value":"2018-05-14"],
    ["name":"End Date","value":"2018-05-20"]
] ]

if let arrayOfDictionary = responseDictionary["report_data"] as? [[String : String]] {
    for dictionary in arrayOfDictionary {
        if let name = dictionary["name"] {
            print(name)
        }
    }
}

好吧，for dictionary in arrayOfDictionary给你错误，因为当你得到它时你的回复实际上是[String : Any]类型。但是当值为Any时，您无法执行大量操作。因此，您需要将Any强制转换为显式类型才能拥有具体对象。您需要先将Any类型数组转换为实际的[[String : String]]类型数组。

修改您注定格式错误的 JSON 。这就是你遇到麻烦的原因。请看下面如何处理Dictionary到JSON：

let responseDictionary: [String : Any] = [ "content": "", "subject": "Weekly Attendance 2018-05-14 - 2018-05-20", "attachments": "[]", "report_data" : [ ["name":"Total Days","value":"7"], ["name":"Present Days","value":"0"], ["name":"Total Hours","value":".0"], ["name":"Average Hours","value":".0"], ["name":"Start Date","value":"2018-05-14"], ["name":"End Date","value":"2018-05-20"] ], "asset_reference": "[]", "activity_reference": "[]", "form_approval_field_reference": "[]" ]

您可能已将此词典转换为JSON，然后转换为JSON字符串。但在此过程中您丢失了JSON标准格式。如何做到这一点：

var text: String = "" do { let jsonData = try JSONSerialization.data(withJSONObject: responseDictionary, options: .prettyPrinted) text = String(data: jsonData, encoding: .utf8) ?? "" } catch { print(error.localizedDescription) }

现在，如果您的text是有效的JSON字符串，那么您最好去：

if let data = text.data(using: .utf8) { do { let response = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any] if let response = response, let arrayOfDictionary = response["report_data"] as? [[String : String]] { for dictionary in arrayOfDictionary { if let name = dictionary["name"] { print(name) } } } } catch { print(error.localizedDescription) } }

Answer 2

func dataToJSON(data: Data) -> AnyObject? {

    do {        
        return try JSONSerialization.jsonObject(with: data, options: []) as AnyObject
    }
    catch let myJSONError {

        print(myJSONError)
    }
    return nil
}

if let list = self.dataToJSON(data: data) as? [Any] {

      // here is array
}

if let list = self.dataToJSON(data: data) as? [String: Any] {

      // here is dictionary
}

从可选对象（字典数组）中获取值？

2 个答案: