相关疑难解决方法(0)

我有一个名为points.json的JSON文件,以及一个读取函数,如:

private func readJson() {
    let file = Bundle.main.path(forResource: "points", ofType: "json")
    let data = try? Data(contentsOf: URL(fileURLWithPath: file!))
    let jsonData = try? JSONSerialization.jsonObject(with: data!, options: []) as! [String:Any]
    print(jsonData)
}

它不起作用,有什么帮助吗？

我尝试将JSON字符串转换为JSON对象,但JSONSerialization输出后是nilJSON.

响应字符串:

[{\"form_id\":3465,\"canonical_name\":\"df_SAWERQ\",\"form_name\":\"Activity 4 with Images\",\"form_desc\":null}]

我尝试使用下面的代码转换此字符串:

let jsonString = response.result.value
let data: Data? = jsonString?.data(using: .utf8)
let json = (try? JSONSerialization.jsonObject(with: data, options: [])) as? [String:AnyObject]
 print(json ?? "Empty Data")

作为一个编码练习,我写了一个小程序,将Web上的MySql数据带到iPhone上.在服务器端.我编写了php脚本来获取脚本以返回json数据.

在xcode上我有

[code]
.
.
.
     let jsonString = try? JSONSerialization.jsonObject(with: data!, options:    [])
    print(jsonString!)
    .
    .
    .
[/code]

在xcode控制台中,我有这个:

[code]
(
        {
        Address = "1 Infinite Loop Cupertino, CA";
        Latitude = "37.331741";
        Longitude = "-122";
        Name = Apple;
    }
)
[/code]

I have a function
    [code]

func convertToDictionary(text: String) -> [String: Any]? {
            if let data = text.data(using: .utf8) {
                do {
                    return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
                } catch {
                    print(error.localizedDescription)
                }
            }
            return nil …

我将此 JSON 保存在文件（“list_catalog.json”）中：

[
 {
  "idcatalog": 1,
  "imgbase64": "",
  "urlImg": "http://172.../page01.jpg",
  "urlPages": "http://172.../catalog_1_pages.json",
  "dt_from": "",
  "dt_to": ""
 },
 {
  "idcatalog": 2,
  "imgbase64": "",
  "urlImg": "http://172.../1.jpg",
  "urlPages": "http://172.../2_pages.json",
  "category": [
   {
    "id": 1,
    "lib": "lib"
   }
  ],
  "dt_to": ""
 }
]

我可以通过以下方式获取该文件：

if let url = URL(string: "http://172.../list_catalogs.json") {
        do {
            let contents = try String(contentsOf: url)
            print(contents)

        } catch {
            // contents could not be loaded
        }
    }

但我无法在字典中转换这个字符串。为了将数据转换为字符串，我使用这个函数：

func convertToDictionary(text: String) -> [String: Any]? {
    if let data = …