使用Swift读取JSON文件

我真的在努力把一个JSON文件读入Swift，这样我就可以玩它了。我花了2天的时间重新搜索和尝试不同的方法，但没有运气，所以我已经注册了StackOverFlow，看看是否有人能给我指点正确的方向.....

我的JSON文件叫做test。Json，并包含以下内容:

{
  "person":[
     {
       "name": "Bob",
       "age": "16",
       "employed": "No"
     },
     {
       "name": "Vinny",
       "age": "56",
       "employed": "Yes"
     }
  ]
}

该文件直接存储在文档中，我使用以下代码访问它:

let file = "test.json"
let dirs : String[] = NSSearchPathForDirectoriesInDomains(
                                                          NSSearchpathDirectory.DocumentDirectory,
                                                          NSSearchPathDomainMask.AllDomainMask,
                                                          true) as String[]

if (dirs != nil) {
    let directories: String[] = dirs
    let dir = directories[0]
    let path = dir.stringByAppendingPathComponent(file)
}

var jsonData = NSData(contentsOfFile:path, options: nil, error: nil)
println("jsonData \(jsonData)" // This prints what looks to be JSON encoded data.

var jsonDict = NSJSONSerialization.JSONObjectWithData(jsonData, options: nil, error: nil) as? NSDictionary

println("jsonDict \(jsonDict)") - This prints nil.....

如果有人能给我一个正确的方向，我可以反序列化JSON文件，并把它放在一个可访问的Swift对象，我会永远感激!

亲切的问候,

Krivvenz。

当前回答

我浪费了我的时间在定位文件，它位于我的项目与名称Jsondata.json。但是我无法通过代码....找到我的文件

解决方案:确保您的Jsondata。在项目>构建阶段>复制Bundle资源中添加了json文件。否则你将无法获得file和Bundle.main。url(forResource: fileName, witheextension: "json")将总是给你nil。

2022-02-28 11:28:03

其他回答

//change type based on your struct and right JSON file

let quoteData: [DataType] =
    load("file.json")

func load<T: Decodable>(_ filename: String, as type: T.Type = T.self) -> T {
    let data: Data

    guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
        else {
            fatalError("Couldn't find \(filename) in main bundle.")
    }

    do {
        data = try Data(contentsOf: file)
    } catch {
        fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
    }

    do {
        let decoder = JSONDecoder()
        return try decoder.decode(T.self, from: data)
    } catch {
        fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)")
    }
}

2019-11-21 18:55:26

Swift 4 JSON类与可解码-为那些喜欢类

定义类如下:

class People: Decodable {
  var person: [Person]?

  init(fileName : String){
    // url, data and jsonData should not be nil
    guard let url = Bundle.main.url(forResource: fileName, withExtension: "json") else { return }
    guard let data = try? Data(contentsOf: url) else { return }
    guard let jsonData = try? JSONDecoder().decode(People.self, from: data) else { return }

    // assigns the value to [person]
    person = jsonData.person
  }
}

class Person : Decodable {
  var name: String
  var age: String
  var employed: String
}

用法，非常抽象:

let people = People(fileName: "people")
let personArray = people.person

这允许People类和Person类的方法，如果需要，变量(属性)和方法也可以标记为private。

2019-03-26 04:48:51

Swift 4.1更新了Xcode 9.2

if let filePath = Bundle.main.path(forResource: "fileName", ofType: "json"), let data = NSData(contentsOfFile: filePath) {

     do {
      let json = try JSONSerialization.jsonObject(with: data as Data, options: JSONSerialization.ReadingOptions.allowFragments)        
        }
     catch {
                //Handle error
           }
 }

2018-07-10 12:09:20

我浪费了我的时间在定位文件，它位于我的项目与名称Jsondata.json。但是我无法通过代码....找到我的文件

2022-02-28 11:28:03

斯威夫特4。X和5。x使用可解码

struct ResponseData: Decodable {
    var person: [Person]
}
struct Person : Decodable {
    var name: String
    var age: String
    var employed: String
}

func loadJson(filename fileName: String) -> [Person]? {
    if let url = Bundle.main.url(forResource: fileName, withExtension: "json") {
        do {
            let data = try Data(contentsOf: url)
            let decoder = JSONDecoder()
            let jsonData = try decoder.decode(ResponseData.self, from: data)
            return jsonData.person
        } catch {
            print("error:\(error)")
        }
    }
    return nil
}

斯威夫特3

func loadJson(filename fileName: String) -> [String: AnyObject]? {
    if let url = Bundle.main.url(forResource: fileName, withExtension: "json") {
        do {
            let data = try Data(contentsOf: url)
            let object = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
            if let dictionary = object as? [String: AnyObject] {
                return dictionary
            }
        } catch {
            print("Error!! Unable to parse  \(fileName).json")
        }
    }
    return nil
}

2016-04-24 19:38:04

使用Swift读取JSON文件

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