iOS：无法快速将 Json 字符串转换为数组？答案

【问题标题】：iOS: Unable to convert Json String to Array in swift?iOS：无法快速将 Json 字符串转换为数组？
【发布时间】：2018-01-29 09:25:24
【问题描述】：

在我的项目中，我想将 Json 字符串从服务器转换为数组但无法转换，但是当我硬编码（直接给出特定的 json 字符串）时，json 字符串意味着将被转换。请帮我找出问题..

这里我给出了我尝试过的代码。

var params = NSMutableDictionary()
    params = [
        "inspectionLogId": inspectionLogIdStr
    ]
    let manager = AFHTTPSessionManager()
    manager.requestSerializer = AFJSONRequestSerializer()
    manager.responseSerializer = AFHTTPResponseSerializer()
    manager.responseSerializer.acceptableContentTypes = NSSet(array: ["text/plain", "text/html", "application/json"]) as Set<NSObject> as Set<NSObject>! as! Set<String>?
    manager.requestSerializer.setValue("", forHTTPHeaderField: "apptoken")
    manager.requestSerializer.setValue(strAppToken, forHTTPHeaderField: "token")
    let urlString:NSString = NSString(format: "%@%@", ApiConstantFile().baseUrlProperty,ApiConstantFile().getTemplateDataUrl)
    print(urlString)
    manager.get(urlString as String, parameters: params, progress: nil, success: {
        (operation, responseObject) in
        self.stopAnimation()

        let jsonstring = String(data: responseObject! as! Data, encoding: String.Encoding.utf8)
        print("jsonstring is:, \(jsonstring!)")

        let data = jsonstring!.data(using: .utf8)!
        print(data)
        do {
            if (try JSONSerialization.jsonObject(with: data, options : .allowFragments) as? [Dictionary<String,Any>]) != nil {
                let jsonArray = try JSONSerialization.jsonObject(with: data, options : .allowFragments) as! [Dictionary<String,Any>]
                print(jsonArray)
            } else {
                print("bad json")
            }
        } catch {
            print(error)
        }

    }, failure: {
        (operation, error) in
        self.stopAnimation()
        print(error)
        self.alert(message: error.localizedDescription)
    })

当我打印 json 字符串时，意味着它们显示为字符串：

"[{\"propertyId\":\"1\",\"inspectionTemplateId\":1118,\"value\":[{\"widgetControllerId\":141,\"value\":\"Flood Summary Name\"},{\"widgetControllerId\":142,\"value\":\"Did the property flood?\"},{\"widgetControllerId\":143,\"value\":\"no\"}]}]"

但是当我直接给出字符串时，意味着它会转换为数组。

let jsonstring = "[{\"propertyId\":\"1\",\"inspectionTemplateId\":1118,\"value\":[{\"widgetControllerId\":141,\"value\":\"Flood Summary Name\"},{\"widgetControllerId\":142,\"value\":\"Did the property flood?\"},{\"widgetControllerId\":143,\"value\":\"no\"}]}]"

【问题讨论】：

从哪里获得responseObject ？
为什么要复制？ stackoverflow.com/questions/48495999/… ?正如@vadian 在另一个问题中所建议的那样，您能给我们data 的值吗？像print("data: \(data as NSData)") 这样的东西？例如可能存在隐藏值（不可见字符）
这不是重复的，这与那个不同。请不要重复。@Larme
为什么不利用AFNetworking 并使用manager.responseSerializer = AFJSONResponseSerializer() 而不是manager.responseSerializer = AFHTTPResponseSerializer()？
不相关，但NSSet(array: ["text/plain", "text/html", "application/json"]) as Set<NSObject> as Set<NSObject>! as! Set<String>? 太可怕了。为什么不简单地Set(["text/plain", "text/html", "application/json"])？为什么NSMutableDictionary 是一个im可变常量？

标签： ios swift

【解决方案1】：

只需将AFHTTPResponseSerializer 替换为AFJSONResponseSerializer，如下所示：

var params = NSMutableDictionary()
params = [
    "inspectionLogId": inspectionLogIdStr
]
let manager = AFHTTPSessionManager()
manager.requestSerializer = AFJSONRequestSerializer()
manager.responseSerializer = AFJSONResponseSerializer()
manager.requestSerializer.setValue("", forHTTPHeaderField: "apptoken")
manager.requestSerializer.setValue(strAppToken, forHTTPHeaderField: "token")
let urlString:NSString = NSString(format: "%@%@", ApiConstantFile().baseUrlProperty,ApiConstantFile().getTemplateDataUrl)
print(urlString)
manager.get(urlString as String, parameters: params, progress: nil, success: {
    (operation, responseObject) in
    self.stopAnimation()
    print(responseObject)

}, failure: {
    (operation, error) in
    self.stopAnimation()
    print(error)
    self.alert(message: error.localizedDescription)
})

【讨论】：