I am working on a weather app that parses JSON data and sets the text of my label to the temp value of the JSON request. I got the value of id from the weather object array, but the temp is not in an array it is just an object. Can someone please tell me where I am wrong. My value is reurning nil because I am not fetching it correctly. Here is my snippet and JSON.
#IBAction func getWeather(sender: AnyObject) {
let requestURL: NSURL = NSURL(string: "http://api.openweathermap.org/data/2.5/weather?lat=35&lon=139&appid=MYAPPID")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(URL: requestURL)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(urlRequest) {
(data, response, error) -> Void in
let httpResponse = response as! NSHTTPURLResponse
let statusCode = httpResponse.statusCode
if (statusCode == 200) {
print("JSON Downloaded Sucessfully.")
do{
let json = try NSJSONSerialization.JSONObjectWithData(data!, options:.AllowFragments)
if let today = json["weather"] as? [[String: AnyObject]] {
//this is pulling 4 key value pairs
for weather in today {
//this works
let id = weather["id"]?.stringValue
self.trumpDescription.text=id;
print(id)
//this is where I am confused it changes from an array to just an object
let temp = json["temp"] as? String
self.currentTempView.text=temp;
print(temp)
}
}
}
catch {
print("Error with Json: \(error)")
}
}
}
task.resume()
}`
Here is the JSON:
{
"coord": {
"lon": 138.93,
"lat": 34.97
},
"weather": [
{
"id": 803,
"main": "Clouds",
"description": "broken clouds",
"icon": "04n"
}
],
"base": "cmc stations",
"main": {
"temp": 292.581,
"pressure": 1019.48,
"humidity": 99,
"temp_min": 292.581,
"temp_max": 292.581,
"sea_level": 1028.92,
"grnd_level": 1019.48
},
"wind": {
"speed": 5.36,
"deg": 237.505
},
"clouds": {
"all": 64
},
"dt": 1464964606,
"sys": {
"message": 0.0037,
"country": "JP",
"sunrise": 1464895855,
"sunset": 1464947666
},
"id": 1851632,
"name": "Shuzenji",
"cod": 200
}
It looks like it should be
if let main = json["main"] as? NSDictionary {
let temp = main["temp"] as! String
print(temp)
}
Instead of this:
let temp = json["temp"] as? String
Try this:
if let main = json["main"] as? [String: AnyObject] {
let temp = main[temp]?.stringValue
print(temp)
//alternatively you can try this as per your convenience of data type
let tempNew = main[temp]?.doubleValue
print(tempNew)
}
Related
I want to create extension for Dictionary [String:Any] which is received from API Response.
Right Now I am doing below way
I have created func getDataFromJson this is working fine, Please let me know how to do that.
func getDataFromJson(json: AnyObject) -> Data?{
do {
print("json = \(json)")
return try JSONSerialization.data(withJSONObject: json, options: JSONSerialization.WritingOptions.prettyPrinted)
} catch let myJSONError {
print("\n\n\nError => getDataFromJson => \(myJSONError)")
}
return nil;
}
This is my response and I want to "data" to Data
{
"status": true,
"message": "Country List",
"data": [
{
"id": 1,
"name": “ABC”,
"code": "A",
"phone_code": "+91”,
"flag": "country-flags/-shiny.png"
},
{
"id": 2,
"name": “ZYX”,
"code": “Z”,
"phone_code": "+1”,
"flag": "country-flags/-shiny.png"
}
]
}
I want to get data this way jsonResponse["data"].retriveData()
Here is a simple function that encodes the dictionary, the function throws any error so it can be properly handled. Since JSONSerialization.data(withJSONObject: takes an Any parameter this function can also be implemented for an array etc
extension Dictionary {
func retriveData() throws -> Data {
return try JSONSerialization.data(withJSONObject: self)
}
}
Simple example
let dict = ["abc": 123, "def": 456]
do {
let data = try dict.retriveData()
let result = try JSONDecoder().decode([String:Int].self, from:data)
print(result)
} catch {
print(error)
}
Another way is to use Result if you're on Swift 5 (shortened after comment from vadian)
extension Dictionary {
func retriveData() -> Result<Data, Error> {
return Result { try JSONSerialization.data(withJSONObject: self) }
}
}
and an example
let result = try dict.retriveData()
switch result {
case .success(let data):
let dictionary = try JSONDecoder().decode([String:Int].self, from:data)
print(dictionary)
case .failure(let error):
print(error)
}
a copy of your function transposed to an extension can be
extension Dictionary {
func retriveData() -> Data? {
do {
return try JSONSerialization.data(withJSONObject: self, options: .prettyPrinted)
} catch let myJSONError {
print("\n\n\nError => getDataFromJson => \(myJSONError)")
}
return nil
}
}
Correct json
{
"status": true,
"message": "Country List",
"data": [
{
"id": 1,
"name": "ABC",
"code": "A",
"phone_code": "+91",
"flag": "country-flags/-shiny.png"
},
{
"id": 2,
"name": "ZYX",
"code": "Z",
"phone_code": "+1",
"flag": "country-flags/-shiny.png"
}
]
}
Model
struct Datum: Codable {
let id: Int
let name, code, phoneCode, flag: String
}
Decoding data only
let str = """
{
"status": true,
"message": "Country List",
"data": [{
"id": 1,
"name": "ABC",
"code": "A",
"phone_code": "+91",
"flag": "country-flags/-shiny.png"
},
{
"id": 2,
"name": "ZYX",
"code": "Z",
"phone_code": "+1",
"flag": "country-flags/-shiny.png"
}
]
}
"""
do {
let dic = try JSONSerialization.jsonObject(with: Data(str.utf8)) as! [String:Any]
let content = try JSONSerialization.data(withJSONObject: dic["data"])
let dec = JSONDecoder()
dec.keyDecodingStrategy = .convertFromSnakeCase
let res = try dec.decode([Datum].self, from: content)
print(res)
}
catch {
print(error)
}
Please try this
// Response Dictionary
let jsonResponse : [String:Any] = ["data":["key1":"value1",
"key2":"value2",
"key3":"value3",
"key4":"value4"]]
// check dictionary contains value for key "data"
if let dataDict = jsonResponse["data"] as? [String:Any] {
// convert dictionary to data
let jsonData = dataDict.retriveData()
print("Json Data :- ", jsonData != nil ? "Success" : "Data is nil")
}
// Dictionary exxtension for converting dictionary to json data
extension Dictionary {
func retriveData() -> Data? {
do {
print("json = \(self)")
return try JSONSerialization.data(withJSONObject: self, options: JSONSerialization.WritingOptions.prettyPrinted)
} catch let myJSONError {
print("\n\n\nError => getDataFromJson => \(myJSONError)")
}
return nil;
}
}
I am starting my adventure with Swift and iOS developing. And I am fighting for few hours with parsing this json result:
[
[
{
"id": 289462,
"value": "24.80",
"taken_at": "2017-07-02 19:03:03",
"key": "temperature"
}
],
[
{
"id": 289463,
"value": "52.20",
"taken_at": "2017-07-02 19:03:05",
"key": "humidity"
}
]
]
It hasn't got this "name" before all of results, and I don't know, maybe this is causing errors? And below is my function to get data:
func get_data()
{
let headers = [
"content-type": "application/x-www-form-urlencoded",
"cache-control": "no-cache",
"postman-token": "fd20c3c4-650e-743c-3066-597de91f3873"
]
let postData = NSMutableData(data: "auth_key=32fd26f62677e7aa56027d9c228e1e9d6d96abc5d10f547dcb66e2a2f6ed13".data(using: String.Encoding.utf8)!)
let request = NSMutableURLRequest(url: NSURL(string: "http://192.168.0.22/last")! as URL,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
if (error != nil) {
// print(error)
} else {
//let httpResponse = response as? HTTPURLResponse
var keys = [String]()
do {
if let data = data,
let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
let mes = json[""] as? [[String: Any]] {
for me in mes {
if let name = me["key"] as? String {
keys.append(name)
}
}
}
} catch {
print("Error deserializing JSON: \(error)")
}
print(keys)
}
})
dataTask.resume()
}
I've tried several codes from different sites which I googled and still array is remaining empty :(
You're right the JSON is strange, the root object is [[Any]]. You can get the key values with
if let json = try JSONSerialization.jsonObject(with: data) as? [[Any]] {
for item in json {
if let firstItem = item.first as? [String:Any], let key = firstItem["key"] as? String {
keys.append(key)
}
}
}
However if the JSON was in much more suitable format
[
{
"id": 289462,
"value": "24.80",
"taken_at": "2017-07-02 19:03:03",
"key": "temperature"
},
{
"id": 289463,
"value": "52.20",
"taken_at": "2017-07-02 19:03:05",
"key": "humidity"
}
]
you could reduce the code to
if let json = try JSONSerialization.jsonObject(with: data) as? [[String:Any]] {
keys = json.flatMap { $0["key"] as? String }
}
I tried the below code for post and get data from json, in struck in getting data from json
http://beta.json-generator.com/api/json/get/EJoC6gB_z
[
{
"UserRole": "User",
"UserName": "Trinadh Reddy",
"Id": 15,
"Email": "trinadhvidavaluru#gmail.com"
},
{
"UserRole": "User",
"UserName": "fayaz sk",
"Id": 16,
"Email": "fayaz.net717#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": "Gowtham M",
"Id": 17,
"Email": "mgowtham666#gmail.com"
},
{
"UserRole": "User",
"UserName": "fayaz sk",
"Id": 18,
"Email": "fayaz8484#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": null,
"Id": 19,
"Email": null
},
{
"UserRole": "User",
"UserName": null,
"Id": 20,
"Email": null
},
{
"UserRole": "NewUser",
"UserName": "Fayaz Shaik",
"Id": 21,
"Email": "fayaz717#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": "Trinadh Reddy",
"Id": 22,
"Email": "trinadh.engineer#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": "tarun gandham",
"Id": 23,
"Email": "gandham.tarun#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": null,
"Id": 24,
"Email": "admin#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": "John",
"Id": 25,
"Email": "john#gmail.com"
},
{
"UserRole": "NewUser",
"UserName": "venkatesh kakumani",
"Id": 26,
"Email": "veenkys01#gmail.com"
}
]
code:
let givenName = user.profile.name
let email = user.profile.email
let param=["UserName":givenName!,"Email":email!] as Dictionary<String,String>
let request = NSMutableURLRequest(url: NSURL(string:"http://sstarapiservice.azurewebsites.net/api/users/")! as URL)
let session = URLSession.shared
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
request.httpBody = try! JSONSerialization.data(withJSONObject: param, options: [])
let task = session.dataTask(with: request as URLRequest) { data, response, error in
guard data != nil else {
print("no data found: \(error)")
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary {
print("Response: \(json)")
if var role = json["UserRole"] as AnyObject? as! String?
{
print("assigned Role= \(role)")
if role == "User"{
print("App permissions approved")
let myStoryBoard:UIStoryboard = UIStoryboard(name:"Main",bundle:nil)
let page=myStoryBoard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController
let pageNav = UINavigationController(rootViewController:page)
let appDelegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController=pageNav
self.window?.rootViewController=pageNav
//self.window?.rootViewController = page
}
else{
print("wait for Approval...")
let myStoryBoard:UIStoryboard = UIStoryboard(name:"Main",bundle:nil)
let page=myStoryBoard.instantiateViewController(withIdentifier: "ApprovalUser") as! HomeViewController
let pageNav = UINavigationController(rootViewController:page)
let appDelegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController=pageNav
self.window?.rootViewController=pageNav
// let myStoryBoard:UIStoryboard = UIStoryboard(name:"Main",bundle:nil)
// let page=myStoryBoard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController
// let pageNav = UINavigationController(rootViewController:page)
// let appDelegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate
// appDelegate.window?.rootViewController=pageNav
// self.window?.rootViewController=pageNav
//self.window?.rootViewController = page
}
}
//
}
else {
var jsonStr = " "
var jsonDictionary = [String: Any]()
jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue) as! String
print("Error could not parse JSON: \(jsonStr)")
print("121")
if var role = jsonStr as String?{
print("role= \(role)")
}
var role = JSONDict["UserRole"] as AnyObject? as! String?
print("success = \(role)")
// if var role = jsonDictionary["UserRole"] as! String?
// {
// print("role is:\(role)")
// }
let myStoryBoard:UIStoryboard = UIStoryboard(name:"Main",bundle:nil)
let page=myStoryBoard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController
let pageNav = UINavigationController(rootViewController:page)
let appDelegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController=pageNav
self.window?.rootViewController=pageNav
}
} catch let parseError {
print(parseError)// Log the error thrown by `JSONObjectWithData`
let jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("Error could not parse JSON: '\(jsonStr)'")
print("12")
}
}
task.resume()
Request JSON data from Webservice APi in Swift 3
Here i have added two types of Methods by Using Alamofire or URLSession : -
import UIKit
import Alamofire
class ViewController: UIViewController {
let urlString = "http://beta.json-generator.com/api/json/get/EJoC6gB_z"
override func viewDidLoad() {
super.viewDidLoad()
// Choose only one function here for calling webservice
getValueofUser()
//Or
getuserDetails()
}
//MARK: - By Using Alamofire
func getValueofUser(){
Alamofire.request(urlString, method: .get)
.responseJSON { response in
print("Success: \(response.result.isSuccess)")
switch response.result {
case .success:
self.successGetTermsData(response: response.result.value! as Any)
case .failure(let error):
print(error)
}
}
}
//MARK: - Or Use URLSession methods
func getuserDetails(){
let url = URL(string: urlString)
URLSession.shared.dataTask(with:url!) { (data, response, error) in
if error != nil {
print(error ?? "")
} else {
do {
let response = try JSONSerialization.jsonObject(with: data!, options: [])
self.successGetTermsData(response: response)
} catch let error as NSError {
print(error)
}
}
}.resume()
}
func successGetTermsData(response: Any){
let arrayOfDetails = response as? [[String: Any]] ?? []
// Do Something with the Array
//Here you will be get Array of User Related Details
let email = arrayOfDetails[0]["Email"] as? String ?? ""
let username = arrayOfDetails[0]["UserName"] as? String ?? ""
let Id = arrayOfDetails[0]["Id"] as? Int ?? 0
let UserRole = arrayOfDetails[0]["UserRole"] as? String ?? ""
print("Email ID -" ,email, "User Name -", username, "ID -",Id, "UserRole -", UserRole)
}
}
OutPut : -
Email ID - trinadhvidavaluru#gmail.com User Name - Trinadh Reddy ID - 15 UserRole - User
I have a JSON file like this:
{
"timeline": {
"Milan": {
"placeA": [
{
"name": "Place 1",
"kind": "historic",
},
{
"name": "Place 2",
"kind": "historic",
},
{
"name": "Place 3",
"kind": "historic",
}
]
},
"Paris": {
"placeB": [
{
"name": "Place 1",
"kind": "historic",
},
{
"name": "Place 2",
"kind": "historic",
}
]
}
}
}
and in my app I need to separate this JSON and insert into a array like this for separate data with tableView section:
var arr = [[placeA],[placeB],...]
how can I do that?
P.S I use SwiftyJson
struct City {
let name : String
let kind : String
}
var cities = [City]()
let path = (try? Data(contentsOf: URL(string: "http://www.yourwebsite.json")!)) as Data!
// let jsonData = NSData(contentsOfFile: path) as NSData!
var error : NSError?
let ReadableJSON2 = JSON ( data:path!, options: JSONSerialization.ReadingOptions.mutableContainers, error: nil )
print(error)
do {
let jsonObject = try JSONSerialization.jsonObject(with: path!, options: JSONSerialization.ReadingOptions.mutableContainers) as! [String:AnyObject]
for city in jsonObject["cities"] as! [[String:AnyObject]] {
//let coordinates = position["Position"] as! [String:CLLocationDegrees]
let Cityname = city["name"] as! String
let Citykind = city["kind"] as! String
let city = City(name: cityName,description: description, )
cities.append(city)
}
} catch let error as NSError {
print(error)
}
I try to parse a response which return a valid JSON with NSJSonSerialization. But it returns nil with no error. It works with another JSON response.
I did some search, and this could be a problem with the encoding of the JSON. I don't know how to solve it. Any idea ?
let url: NSURL = NSURL(string: urlPath)!
self.searchRequest = NSMutableURLRequest(URL: url)
if let searchRequest = self.searchRequest {
searchRequest.HTTPMethod = "GET"
let authString : String = SNCF.APIKey + ":" + ""
let authData : NSData = authString.dataUsingEncoding(NSASCIIStringEncoding)!
let authValue : String = "Basic " + authData.base64EncodedStringWithOptions(.EncodingEndLineWithCarriageReturn)
searchRequest.setValue(authValue, forHTTPHeaderField: "Authorization")
let queue:NSOperationQueue = NSOperationQueue()
NSURLConnection.sendAsynchronousRequest(searchRequest, queue: queue, completionHandler:{ (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in
do {
//HERE JSONRESULT WILL BE NIL
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? [String: [AnyObject]] {
print("ASynchronous\(jsonResult)")
if let places = jsonResult["stop_areas"] as? [[String:AnyObject]]{
for placeDictionary in places {
if let labelText = placeDictionary["label"] as? String {
self.resultDatasource.append(labelText)
}
}
self.resultTableView.reloadData()
}
}
//HERE NO ERROR IS CATCHED
} catch let error as NSError {
print(error.localizedDescription)
}
})
Piece of my json response :
{
"disruptions": [],
"pagination": {
"start_page": 0,
"items_on_page": 100,
"items_per_page": 100,
"total_result": 3053
},
"stop_areas": [
{
"codes": [
{
"type": "CR-CI-CH",
"value": "0080-251967-BV"
}
],
"name": "gare de Perl",
"links": [],
"coord": {
"lat": "0",
"lon": "0"
},
"label": "gare de Perl",
"timezone": "Europe/Paris",
"id": "stop_area:OCE:SA:80251967"
},
{
...
},
//stop_areas dictionaries object...
], //end stop_areas array of dictionaries
"links": [
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas/{stop_areas.id}",
"type": "stop_areas",
"rel": "stop_areas",
"templated": true
},
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas?start_page=1",
"type": "next",
"templated": false
},
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas?start_page=30.52",
"type": "last",
"templated": false
},
{
"href": "https://api.sncf.com/v1/coverage/sncf/stop_areas",
"type": "first",
"templated": false
}
],
"feed_publishers": [
{
"url": "",
"id": "sncf",
"license": "",
"name": ""
}
]
}
The type of the JSON is [String: AnyObject] not [String: [AnyObject]]
I think this is the problem:
as? [String: [AnyObject]]
Try to remove the cast. If your JSON is correct and has no validation errors, the dictionary you get probably has the key value of type Any. You can try to use the dictionary by only casting the value keys you want:
if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: nil) {
print("ASynchronous\(jsonResult)")
if let places = jsonResult["stop_areas"] as? [[String:AnyObject]] {
...
}
}
Try This
do {
if let jsonResult: Dictionary = try NSJSONSerialization.JSONObjectWithData(self.mutableData, options: NSJSONReadingOptions.MutableContainers) as? Dictionary<String, AnyObject>
{
// print("get Read messages == \(jsonResult)");
if ((jsonResult["Warning"]) != nil)
{
let error_by_wc: NSString = jsonResult["Warning"] as! String
//print("results == \(error_by_wc)");
// printMessage("\(error_by_wc)")
JLToast.makeText("\(error_by_wc)").show()
}else if((jsonResult["Error"]) != nil)
{
let error_by_wc: NSString = jsonResult["Error"] as! String
// print("results == \(error_by_wc)");
// printMessage("\(error_by_wc)")
JLToast.makeText("\(error_by_wc)").show()
}
else
{
// read message s
}
} catch {
print(error)
}
If Data is Array Type Use this code
do {
if let jsonResult:NSArray = try NSJSONSerialization.JSONObjectWithData(self.mutableData, options: .MutableContainers) as? NSArray {
//print(jsonResult)
aDataBase.insertFromUserImage(jsonResult)
connection_allMEssages()
}else
{
//print("not data found")
BProgressHUD.dismissHUD(0)
}
} catch {
print(error)
BProgressHUD.dismissHUD(0)
}