SwiftJSONParse：解析JSON就像一个坏蛋

Question

我有一个JSON文件，想要解析并使用表视图中的对象列表。任何人都可以共享代码来解析swift中的JSON文件。

Answer 1

无法更简单：

import Foundation

let jsonData: Data = /* get your json data */
let jsonDict = try JSONSerialization.jsonObject(with: jsonData) as? NSDictionary

话虽如此，我强烈建议您使用Swift 4中引入的Codable APIs。

Answer 2

发出API请求

var request: NSURLRequest = NSURLRequest(URL: url)
var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)

准备回复

声明一个数组如下

var data: NSMutableData = NSMutableData()

收到回复

1

func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
   // Received a new request, clear out the data object
   self.data = NSMutableData()
}

2

func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
   // Append the received chunk of data to our data object
   self.data.appendData(data)
}

3

func connectionDidFinishLoading(connection: NSURLConnection!) {
   // Request complete, self.data should now hold the resulting info
   // Convert the retrieved data in to an object through JSON deserialization
   var err: NSError
   var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary

   if jsonResult.count>0 && jsonResult["results"].count>0 {
      var results: NSArray = jsonResult["results"] as NSArray
      self.tableData = results
      self.appsTableView.reloadData()

   }
}

当NSURLConnection收到响应时，我们可以期待代表我们调用didReceiveResponse方法。此时我们只需通过说self.data = NSMutableData（）来重置数据，创建一个新的空数据对象。

建立连接后，我们将开始在方法didReceiveData中接收数据。在这里传递的数据参数是我们所有丰富信息的来源。我们需要保留每个进入的块，因此我们将它附加到我们之前清除的self.data对象。

最后，当连接完成并收到所有数据后，将调用connectionDidFinishLoading，我们已准备好使用我们应用中的数据。万岁！

这里的connectionDidFinishLoading方法使用NSJSONSerialization类通过反序列化Url的结果将原始数据转换为有用的Dictionary对象。

Answer 3

我刚刚编写了一个名为JSON的类，它使Swift中的JSON处理像ES5中的JSON对象一样简单。

https://github.com/dankogai/swift-json/

将swift对象转换为JSON，如下所示：

let obj:[String:AnyObject] = [
    "array": [JSON.null, false, 0, "",[],[:]],
    "object":[
        "null":   JSON.null,
        "bool":   true,
        "int":    42,
        "double": 3.141592653589793,
        "string": "a α\t弾\n",
        "array":  [],
        "object": [:]
    ],
    "url":"http://blog.livedoor.com/dankogai/"
]

let json = JSON(obj)
json.toString()

...或字符串......

let json = JSON.parse("{\"array\":[...}")

...或网址。

let json = JSON.fromURL("http://api.dan.co.jp/jsonenv")
Tree Traversal

只需通过下标遍历元素：

json["object"]["null"].asNull       // NSNull()
// ...
json["object"]["string"].asString   // "a α\t弾\n"
json["array"][0].asNull             // NSNull()
json["array"][1].asBool             // false
// ...

就像SwiftyJSON一样，如果下标条目不存在，你也不用担心。

if let b = json["noexistent"][1234567890]["entry"].asBool {
    // ....
} else {
    let e = json["noexistent"][1234567890]["entry"].asError
    println(e)
}

如果您厌倦了下标，请添加您的方案：

//// schema by subclassing
class MyJSON : JSON {
    init(_ obj:AnyObject){ super.init(obj) }
    init(_ json:JSON)  { super.init(json) }
    var null  :NSNull? { return self["null"].asNull }
    var bool  :Bool?   { return self["bool"].asBool }
    var int   :Int?    { return self["int"].asInt }
    var double:Double? { return self["double"].asDouble }
    var string:String? { return self["string"].asString }
}

你走了：

let myjson = MyJSON(obj)
myjson.object.null
myjson.object.bool
myjson.object.int
myjson.object.double
myjson.object.string
// ...

希望你喜欢它。

使用新的xCode 7.3+将您的域添加到例外列表（How can I add NSAppTransportSecurity to my info.plist file?）非常重要，请参阅此帖子以获取说明，否则您将收到传输权限错误。

Answer 4

以下是在Swift 2.0中进行JSON和NSData之间转换的代码

// Convert from NSData to json object
func nsdataToJSON(data: NSData) -> AnyObject? {
    do {
        return try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil
}

// Convert from JSON to nsdata
func jsonToNSData(json: AnyObject) -> NSData?{
    do {
        return try NSJSONSerialization.dataWithJSONObject(json, options: NSJSONWritingOptions.PrettyPrinted)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil;
}

Answer 5

第1步。安装Swifty Json https://github.com/SwiftyJSON/SwiftyJSON

注意： 如果您正在寻找这个，那么您很可能不知道如何安装swifty。按照https://guides.cocoapods.org/using/getting-started.html#toc_3

上的说明操作

sudo gem install cocoapods

cd~ / Path / To / Folder / Containing / ShowTracker

接下来输入此命令：

pod init

这将为您的项目创建默认Podfile。 Podfile是您定义项目所依赖的依赖项的地方。

键入此命令以使用Xcode打开Podfile进行编辑：

打开-a Xcode Podfile

将Swifty添加到podfile

platform :ios, '8.0'
use_frameworks!

target 'MyApp' do
    pod 'SwiftyJSON', '~> X.X.X'
end

第2步。检查此示例

var mURL = NSURL(string: "http://api.openweathermap.org/data/2.5/weather?q=London,uk&units=metric")


if mURL == nil{
      println("You are stupid")
      return
          }
var request = NSURLRequest(URL: mURL!)

NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in


   if data != nil {
                        var mJSON = JSON(data: data!)

                        if let current_conditions = mJSON["weather"][0]["description"].string{
                            println("Current conditions: " + current_conditions)
                        } else {
                            println("MORON!")
                        }

                        if let current_temperature = mJSON["main"]["temp"].double{
                                 println("Temperature: "+ String(format:"%.f", current_temperature)  + "°C"
                        } else {
                            println("MORON!")
                        }

                    }
                })

第3步。利润

Answer 6

在Swift中解析JSON对于代码生成来说是一个很好的工作。我在http://www.guideluxe.com/JsonToSwift创建了一个工具来做这件事。

您提供了一个带有类名的示例JSON对象，该工具将生成相应的Swift类以及任何所需的子Swift类，以表示示例JSON隐含的结构。还包括用于填充Swift对象的类方法，包括使用NSJSONSerialization.JSONObjectWithData方法的方法。提供了NSArray和NSDictionary对象的必要映射。

从生成的代码中，您只需提供一个NSData对象，其中包含与提供给工具的样本匹配的JSON。

除了Foundation之外，没有依赖关系。

我的工作受到http://json2csharp.com/的启发，这对于.NET项目非常方便。

以下是如何从JSON文件创建NSData对象。

let fileUrl: NSURL = NSBundle.mainBundle().URLForResource("JsonFile", withExtension: "json")!
let jsonData: NSData = NSData(contentsOfURL: fileUrl)!

Answer 7

SwiftJSONParse：解析JSON就像一个坏蛋

简单易读！

示例：从此`"mrap"`获取值`nicknames`作为此JSON响应中的字符串

{
    "other": {
        "nicknames": ["mrap", "Mikee"]
}

它将您的json数据NSData保持原样，无需预处理。

let parser = JSONParser(jsonData)

if let handle = parser.getString("other.nicknames[0]") {
    // that's it!
}

免责声明：我做到了这一点，我希望它能帮到每个人。随意改进吧！

Answer 8

我还写了一个小型库，专门用于将json响应映射到对象结构中。我在内部使用David Owens的json-swift库。也许这对其他人有用。

https://github.com/prine/ROJSONParser

示例 Employees.json

{
"employees": [
  {
    "firstName": "John",
    "lastName": "Doe",
    "age": 26
  },
  {
    "firstName": "Anna",
    "lastName": "Smith",
    "age": 30
  },
  {
    "firstName": "Peter",
    "lastName": "Jones",
    "age": 45
  }]
}

下一步，您必须创建数据模型（EmplyoeeContainer和Employee）。

Employee.swift

class Employee : ROJSONObject {

    required init() {
        super.init();
    }

    required init(jsonData:AnyObject) {
        super.init(jsonData: jsonData)
    }

    var firstname:String {
        return Value<String>.get(self, key: "firstName")
    }

    var lastname:String {
        return Value<String>.get(self, key: "lastName")            
    }

    var age:Int {
        return Value<Int>.get(self, key: "age")
    }
}

EmployeeContainer.swift

class EmployeeContainer : ROJSONObject {
    required init() {
        super.init();
    }

    required init(jsonData:AnyObject) {
        super.init(jsonData: jsonData)
    }

    lazy var employees:[Employee] = {
        return Value<[Employee]>.getArray(self, key: "employees") as [Employee]
    }()
}

然后，要实际映射JSON响应中的对象，您只需将数据作为构造函数中的param传递给EmployeeContainer类。它会自动创建您的数据模型。

 var baseWebservice:BaseWebservice = BaseWebservice();

  var urlToJSON = "http://prine.ch/employees.json"

  var callbackJSON = {(status:Int, employeeContainer:EmployeeContainer) -> () in
    for employee in employeeContainer.employees {
      println("Firstname: \(employee.firstname) Lastname: \(employee.lastname) age: \(employee.age)")
    }
  }

  baseWebservice.get(urlToJSON, callback:callbackJSON)

控制台输出看起来如下：

Firstname: John Lastname: Doe age: 26
Firstname: Anna Lastname: Smith age: 30
Firstname: Peter Lastname: Jones age: 45

Answer 9

整个viewcontroller，它使用两种json parsig方法在收集视图中显示数据

@IBOutlet weak var imagecollectionview: UICollectionView!
lazy var data = NSMutableData()
var dictdata : NSMutableDictionary = NSMutableDictionary()
override func viewDidLoad() {
    super.viewDidLoad()
    startConnection()
    startNewConnection()
    // Do any additional setup after loading the view, typically from a nib.
}


func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return dictdata.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

    let cell  = collectionView.dequeueReusableCellWithReuseIdentifier("CustomcellCollectionViewCell", forIndexPath: indexPath) as! CustomcellCollectionViewCell
    cell.name.text = dictdata.valueForKey("Data")?.valueForKey("location") as? String
    let url = NSURL(string: (dictdata.valueForKey("Data")?.valueForKey("avatar_url") as? String)! )

    LazyImage.showForImageView(cell.image, url:"URL
    return cell
}
func collectionView(collectionView: UICollectionView,
                    layout collectionViewLayout: UICollectionViewLayout,
                           sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    let kWhateverHeightYouWant = 100
    return CGSizeMake(self.view.bounds.size.width/2, CGFloat(kWhateverHeightYouWant))
}

func startNewConnection()
{

   let url: URL = URL(string: "YOUR URL" as String)!
    let session = URLSession.shared

    let request = NSMutableURLRequest(url: url as URL)
    request.httpMethod = "GET" //set the get or post according to your request

    //        request.cachePolicy = NSURLRequest.CachePolicy.ReloadIgnoringCacheData
    request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData

    let task = session.dataTask(with: request as URLRequest) {
        ( data, response, error) in

        guard let _:NSData = data as NSData?, let _:URLResponse = response, error == nil else {
            print("error")
            return
        }

       let jsonString = NSString(data: data!, encoding:String.Encoding.utf8.rawValue) as! String
               }
    task.resume()

}

func startConnection(){
    let urlPath: String = "your URL"
    let url: NSURL = NSURL(string: urlPath)!
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
    connection.start()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.data.appendData(data)
}

func buttonAction(sender: UIButton!){
    startConnection()
}

func connectionDidFinishLoading(connection: NSURLConnection!) {
    do {
        let JSON = try NSJSONSerialization.JSONObjectWithData(self.data, options:NSJSONReadingOptions(rawValue: 0))
        guard let JSONDictionary :NSDictionary = JSON as? NSDictionary else {
            print("Not a Dictionary")
            // put in function
            return
        }
        print("JSONDictionary! \(JSONDictionary)")
        dictdata.setObject(JSONDictionary, forKey: "Data")

        imagecollectionview.reloadData()
    }
    catch let JSONError as NSError {
        print("\(JSONError)")
    }    }

Answer 10

使用ObjectMapper framework

if let path = Bundle(for: BPPView.self).path(forResource: jsonFileName, ofType: "json") {
        do {
            let data = try Data(contentsOf: URL(fileURLWithPath: path), options: NSData.ReadingOptions.mappedIfSafe)
            let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
            self.levels = Mapper<Level>().mapArray(JSONArray: (json as! [[String : Any]]))!
            print(levels.count)
        } catch let error as NSError {
            print(error.localizedDescription)
        }
    } else {
        print("Invalid filename/path.")
    }

在准备适当的集合之前：要解析的可映射对象

import UIKit 
import ObjectMapper
class Level: Mappable {
var levelName = ""
var levelItems = [LevelItem]()

required init?(map: Map) {

}

// Mappable
func mapping(map: Map) {
    levelName <- map["levelName"]
    levelItems <- map["levelItems"]
}
}

 import UIKit 
import ObjectMapper 
class LevelItem: Mappable {
var frontBackSide = BPPFrontBack.Undefined
var fullImageName = ""
var fullImageSelectedName = ""
var bodyParts = [BodyPart]()

required init?(map: Map) {

}

// Mappable
func mapping(map: Map) {
    frontBackSide <- map["frontBackSide"]
    fullImageName <- map["fullImageName"]
    fullImageSelectedName <- map["fullImageSelectedName"]
    bodyParts <- map["bodyParts"]
}}

Answer 11

Swift 3

let parsedResult: [String: AnyObject]

do {

    parsedResult = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:AnyObject]

} catch {

    // Display an error or return or whatever
}

数据 - 它是数据类型（结构）（即由某些服务器响应返回）

Answer 12

可编码

在Swift 4+中，强烈建议使用Codable而不是JSONSerialization。

此Codable包括两个协议：Decodable和Encodable。通过该Decodable协议，您可以将JSON格式的Data解码为符合该协议的自定义结构/类。

例如，想象一下我们有一个简单的Data（两个对象的数组）的情况

let data = Data("""
[
    {"name":"Steve","age":56}, 
    {"name":"iPhone","age":11}
]
""".utf8)

然后遵循以下struct并实现协议Decodable

struct Person: Decodable {
    let name: String
    let age: Int
}

现在您可以使用Data将Person解码到JSONDecoder的数组中，其中第一个参数的类型符合Decodable，并且该类型应Data被解码

do {
    let people = try JSONDecoder().decode([Person].self, from: data)
} catch { print(error) }

...请注意，解码必须用try关键字标记，因为例如您可能在命名时犯了一些错误，然后您的模型无法正确解码...因此您应该将其放入do -try-catch块

在json中键入密钥与属性名称不同的情况：

如果密钥是使用snake_case命名的，则可以将解码器的keyDecodingStrategy设置为convertFromSnakeCase，从而将密钥从property_name更改为camelCase propertyName
```
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let people = try decoder.decode([Person].self, from: data)
```

如果您需要唯一的名称，则可以在声明密钥名称的struct / class中使用编码密钥

let data = Data(""" 
{ "userName":"Codable", "age": 1 } 
""".utf8)

struct Person: Decodable {

    let name: String
    let age: Int

    enum CodingKeys: String, CodingKey {
        case name = "userName"
        case age
    }
}

Answer 13

Swift2 iOs9

   let miadata = NSData(contentsOfURL: NSURL(string: "https://myWeb....php")!)

    do{
        let MyData = try NSJSONSerialization.JSONObjectWithData(miadata!, options: NSJSONReadingOptions.MutableContainers) as? NSArray

         print(".........\(MyData)")

    }
    catch let error as NSError{
        // error.description
        print(error.description)
    }

Answer 14

此解析器使用泛型将JSON强制转换为Swift类型，从而减少了键入所需的代码。

https://github.com/evgenyneu/JsonSwiftson

struct Person {
  let name: String?
  let age: Int?
}

let mapper = JsonSwiftson(json: "{ \"name\": \"Peter\", \"age\": 41 }")

let person: Person? = Person(
  name: mapper["name"].map(),
  age: mapper["age"].map()
)

Answer 15

以下是Swift Playground示例：

import UIKit

let jsonString = "{\"name\": \"John Doe\", \"phone\":123456}"

let data = jsonString.data(using: .utf8)

var jsonObject: Any
do {
    jsonObject = try JSONSerialization.jsonObject(with: data!) as Any

    if let obj = jsonObject as? NSDictionary {
        print(obj["name"])
    }
} catch {
    print("error")
}

Answer 16

Swift 4 API请求示例

利用JSONDecoder().decode

观看此视频WSO2 IoT Server 3.1.0 - Docuemntation | Device Ownership Application

struct Post: Codable {
    let userId: Int
    let id: Int
    let title: String
    let body: String
}

URLSession.shared.dataTask(with: URL(string: "https://jsonplaceholder.typicode.com/posts")!) { (data, response, error) in

        guard let response = response as? HTTPURLResponse else {
            print("HTTPURLResponse error")
            return
        }

        guard 200 ... 299 ~= response.statusCode else {
            print("Status Code error \(response.statusCode)")
            return
        }

        guard let data = data else {
            print("No Data")
            return
        }

        let posts = try! JSONDecoder().decode([Post].self, from: data)
        print(posts)

    }.resume()

Answer 17

Swift 4

创建项目

使用Button和UITableview设计StoryBoard

创建TableViewCell VC

按钮操作插入以下代码

记住此代码以获取Api中的数据数据

import UIKit

class ViewController3: UIViewController,UITableViewDelegate,UITableViewDataSource {

    @IBOutlet var tableView: UITableView!
    var displayDatasssss = [displyDataClass]()
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return displayDatasssss.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell1") as! TableViewCell1
        cell.label1.text = displayDatasssss[indexPath.row].email
        return cell
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func gettt(_ sender: Any) {

        let url = "http://jsonplaceholder.typicode.com/users"
        var request = URLRequest(url: URL(string: url)!)
        request.httpMethod = "GET"
        let configuration = URLSessionConfiguration.default
        let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main)
        let task = session.dataTask(with: request){(data, response,error)in
            if (error != nil){
                print("Error")
            }
            else{
                do{
                    // Array of Data 
                    let fetchData = try JSONSerialization.jsonObject(with: data!, options: .mutableLeaves) as! NSArray

                    for eachData in fetchData {

                        let eachdataitem = eachData as! [String : Any]
                        let name = eachdataitem["name"]as! String
                        let username = eachdataitem["username"]as! String

                        let email = eachdataitem["email"]as! String
                         self.displayDatasssss.append(displyDataClass(name: name, username: username,email : email))
                    }
                    self.tableView.reloadData()
                }
                catch{
                    print("Error 2")
                }

            }
        }
        task.resume()

    }
}
class displyDataClass {
    var name : String
    var username : String
    var email : String

    init(name : String,username : String,email :String) {
        self.name = name
        self.username = username
        self.email = email
    }
}

这是用于字典数据提取

import UIKit

class ViewController3: UIViewController,UITableViewDelegate,UITableViewDataSource {

    @IBOutlet var tableView: UITableView!
    var displayDatasssss = [displyDataClass]()
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return displayDatasssss.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell1") as! TableViewCell1
        cell.label1.text = displayDatasssss[indexPath.row].email
        return cell
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func gettt(_ sender: Any) {

        let url = "http://jsonplaceholder.typicode.com/users/1"
        var request = URLRequest(url: URL(string: url)!)
        request.httpMethod = "GET"
        let configuration = URLSessionConfiguration.default
        let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main)
        let task = session.dataTask(with: request){(data, response,error)in
            if (error != nil){
                print("Error")
            }
            else{
                do{
                    //Dictionary data Fetching
                    let fetchData = try JSONSerialization.jsonObject(with: data!, options: .mutableLeaves) as! [String: AnyObject]
                        let name = fetchData["name"]as! String
                        let username = fetchData["username"]as! String

                        let email = fetchData["email"]as! String
                         self.displayDatasssss.append(displyDataClass(name: name, username: username,email : email))

                    self.tableView.reloadData()
                }
                catch{
                    print("Error 2")
                }

            }
        }
        task.resume()

    }
}
class displyDataClass {
    var name : String
    var username : String
    var email : String

    init(name : String,username : String,email :String) {
        self.name = name
        self.username = username
        self.email = email
    }
}

如何在swift中解析JSON文件？

17 个答案:

SwiftJSONParse：解析JSON就像一个坏蛋

示例：从此`"mrap"`获取值`nicknames`作为此JSON响应中的字符串

可编码

Swift 4 API请求示例

如何在swift中解析JSON文件？

17 个答案:

SwiftJSONParse：解析JSON就像一个坏蛋

示例：从此"mrap"获取值nicknames作为此JSON响应中的字符串

可编码

Swift 4 API请求示例

示例：从此`"mrap"`获取值`nicknames`作为此JSON响应中的字符串