Swift 3 JSON Array to Dictionary - arrays

I have a JSON result from Alamofire and SwiftyJSON and am trying to create a dictionary from it to create an array
JSON Result
JSON: [
{
"p_589b6a49a0bfd" : {
"path" : "\/uploads\/588fa43eba3c9\/588fa43eba3c9_1486580297.jpg",
"likes" : "0",
"userid" : "588fa43eba3c9",
"caption" : "Bae",
"comments" : "0",
"date" : "1486580297"
}
},
{
"p_589b7f1c540f1" : {
"path" : "\/uploads\/588fa43eba3c9\/588fa43eba3c9_1486585628.jpg",
"likes" : "0",
"userid" : "588fa43eba3c9",
"caption" : "Hot stuff bitch ",
"comments" : "0",
"date" : "1486585628"
}
}
]
Request/Response
Alamofire.request(BASE_URL + "index.php/feed/build", method: .get, headers: headers).responseJSON { response in
switch response.result {
case .success(let value):
let json = JSON(value)
print("JSON: \(json)")
case .failure(let error):
print(error)
}
}
I have then set up a simple class called 'FeedPost' which will store each of the elements in JSON response (this is the function in the FeedPost class)
init(postid: String, postData: Dictionary<String, AnyObject>) {
self._postid = postid
if let caption = postData["caption"] as? String {
self._caption = caption
}
if let path = postData["path"] as? String {
self._path = path
}
if let likes = postData["likes"] as? Int {
self._likes = likes
}
if let comments = postData["comments"] as? Int {
self._comments = comments
}
if let userid = postData["userid"] as? String {
self._userid = userid
}
if let date = postData["date"] as? String {
self._date = date
}
}
I need to somehow cycle through the JSON to create a dictionary to pass to FeedPost then add each FeedPost to another array called Posts during the request. The string that starts with 'p_' I want to use as the postid

With Alamofire response you have used SwiftyJSON and with your FeedPost init you are using swift native dictionary. So I'm suggesting you to either work with SwiftyJSON or with swift's native type. Since you have already added init with dictionary I'm answering your answer with native type.
Alamofire.request(BASE_URL + "index.php/feed/build", method: .get, headers: headers).responseJSON { response in
switch response.result {
case .success(let value):
If let dic = value as? [String: Any],
let array = DIC["JSON"] as? [[String: Any]] {
for item in array {
for (key, value) in item {
If let subDic = value as? [String: Any] {
let obj = FeedPost(postid: key, postData: subDic)
}
}
}
}
print("JSON: \(json)")
case .failure(let error):
print(error)
}
}
Note: Correct Dictionary notation for JSON in swift 3 is [String: Any] not [String: AnyObject] so change your init parameter postData's type to [String: Any].

Below is the code which can be used for your case, This code is copied from playgrounds.
import UIKit
typealias JSONDictionary = [String: AnyObject]
class Post {
let id: String
let userId: String?
let date: Double?
let caption: String?
let comments: Double?
let likes: Double?
let path: String?
init?(with dictionary: JSONDictionary) {
guard let postId = dictionary.keys.first, let postInfo = dictionary[postId] as? JSONDictionary else { return nil }
self.id = postId
self.userId = postInfo["userid"] as? String
self.date = postInfo["date"] as? Double
self.caption = postInfo["caption"] as? String
self.comments = postInfo["comments"] as? Double
self.likes = postInfo["likes"] as? Double
self.path = postInfo["path"] as? String
}
}
Parsing JSON array will be like this.
case .success(let value):
let jsonArray = value["JSON"] as? [JSONDictionary]
let posts = jsonArray?.flatMap(Post.init(with:))
print("Posts \(posts)"
case .failure: break
I have tried this using a local JSON file in a Playgrounds & code was something like this.
let url = Bundle.main.url(forResource: "data", withExtension: "json")
let data = try! Data(contentsOf: url!)
let jsonArray = try! JSONSerialization.jsonObject(with: data , options: .allowFragments) as? [JSONDictionary]
let posts = jsonArray?.flatMap(Post.init(with:))

Related

How to loop through a JSON object in Vapor 1.5 and convert it to [String:Any]?

I am sending a request to my vapor 1.5 server via Alamofire with body of type [String:Any] where Any type is a dictionary of String:String
When the request is received on the server I convert it to JSON type
guard let reqJson = request.json else {return}
How can I loop through this JSON object and convert it to an array of [String:Any]
The body of the request I send from the client app looks like this:
["DHSKL3920JFLSKXFgs":
["title": “some title”,
"body": “some body”,
"DHSKL3920JFLSKXFgs": "DHSKL3920JFLSKXFgs",
"unreadMessagesCount": 3],
"PKF993AVG59gkCM":
["title": “some title”,
"body": “some body”,
"DHSKL39": "DHSKL39",
"unreadMessagesCount": 3]]
You can use swift4 Codable and shrink your code to 4-5 lines. Documentation
If I understood you correctly. Maybe the following will help.
//This method uses high order function map
func convert(json:[String:Any]) -> [[String: Any]] {
let requiredObjects = json.map { $0.value as! [String:Any] } //force unwrapping
return requiredObjects
}
//This method uses simple loop
func convert(json:[String:Any]) -> [[String: Any]] {
var requiredObjects = [[String:Any]]()
for (key, value) in json.enumerated() {
requiredObjects.append([value.key : value.value])
}
return requiredObjects
}
struct DataFromClientSendNotifications {
let title: String
let body: String
let sound: String
let badge: String
let fcmToken: String
let unreadMessagesCount: String
}
guard let reqJson = request.json else {
throw Abort.custom(status: .badRequest, message: message)
}
for obj in reqJson.object! {
print("new obj is \(obj)")
let objKey = obj.key
let objValue = obj.value.object
print("objectValue here is \(objValue)")
let title = objValue?["title"]?.string
let body = objValue?["body"]?.string
let unreadMessagesCount = objValue?["unreadMessagesCount"]?.string
let sound = objValue?["sound"]?.string
let badge = objValue?["badge"]?.string
let fcmToken = objValue?["objValue"]?.string
let itemCompleted = DataFromClientSendNotifications(title: title!, body: body!, sound: sound!, badge: badge!, fcmToken: fcmToken!, unreadMessagesCount: unreadMessagesCount!)
print("itemCompleted is \(itemCompleted)")
//now you can do whatever you want with itemCompleted
}

swift vapor json response to array

using swift vapor and elasticsearch, got a response like:
{
"_shards": {
"failed": 0,
"successful": 5,
"total": 5
},
"hits": {
"hits": [
{
"_id": "3",
"_index": "items_v1",
"_score": 1.2029922,
"_source": {
"property1": "test",
"property2": "another test",
...
},
"_type": "item"
},
...
inside "hits" -> "hits" -> "_source" I got all the properties of my model "Item". How can I create an array of Items "[Item]" from this json response?
Small enhancement, use a guard statement to avoid the nested ifs...
guard
let dict = response as? [String : Any],
let hits = dict["hits"] as? [String : Any],
let hitArray = hits["hits"] as? [[String : Any]]
else
{ throw Abort}
for hit in hitArray {
if let source = hit["_source"] {
arrayOfItems.append(Item(with: source))
}
}
Parse your response in this way, so there will be no crashes if some value will not be sent.
if let dict = response as? [String : Any] {
if let hits = dict["hits"] as? [String : Any] {
if let hitArray = hits["hits"] as? [[String : Any]] {
for hit in hitArray {
if let source = hit["_source"] {
arrayOfItems.append(Item(with: source))
}
}
}
}
}
Int your Item class create init method, where you will initialize item's properties.
init(with dict: [String : Any]) {
if let property1 = dict["property1"] as? Int {
self.property1 = property1
}
super.init()
}
Try like this! I assume that you get the Response and that response in saved in response variable
var myarray = [String]()
let hitDict = response["hits"] as! [String:AnyObject]
let hitArray = hitDict["hits"] as! Array
let someDict = hitArray[0] as! [String:AnyObject]
let sourcDict = someDict["_source"] as! [String:AnyObject]
let property1 = sourcDict["property1"] as! String
let property2 = sourcDict["property2"] as! String
myarray.append(property1)
myarray.append(property2)
var myArray = [String:String]()
//response from try drop.client.get(…)
let bodyReceived = responseFirebaseAssigned?.body.bytes
//JSON object made of bodyReceived
let JsonFirebase:JSON?
for val in JsonFirebase?.object ?? [:]{
let valKey = val.key.string
let valValue = val.value.string
arrayFB[valKey!] = valValue
print("arrayFB is \(arrayFB)")
}

Working With Json in swift 3

I want to get long_name from this JSON file I can just access 'results' with this code:
let url = URL(string: "https://maps.googleapis.com/maps/api/geocode/json?latlng=35.7229513,51.3566039&language=fa&key=AIzaSyBXOPT1jEYizWZHOKLwv4dhacgYTcmn3I4")!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error!)
}
else{
if let urlcontent = data {
do{
let jsonResult = try JSONSerialization.jsonObject(with: urlcontent, options: JSONSerialization.ReadingOptions.mutableContainers) as! [String:Any]
print(jsonResult["results"]!)
if let jsonResult = jsonResult["results"] as? [String: Any] {
if let address_components = jsonResult["address_components"] as? [String: Any] {
print(address_components)
if let long_name = address_components["long_name"] as? [String: Any] {
print(long_name)
}
}
}
}
catch{
print("json failed")
}
}
}
}
task.resume()
But I'm just getting result this is my JSON file:
https://maps.googleapis.com/maps/api/geocode/json?latlng=35.7339859%2C51.3393980&sensor=true_or_false&language=fa
Your result key contains Array as value not Dictionary so simply change [String:Any] to [[String:Any]] and then access address_components from the each dictionary objects of resultsArray, now address_components is also array of dictionary and long_name is inside that dictionary. So try like this.
if let resultsArray = jsonResult["results"] as? [[String: Any]] {
for dic in resultsArray {
if let addressArray = dic["address_components"] as? [[String:Any]] {
for address in addressArray {
if let longName = address["long_name"] as? String {
print(longName)
}
}
}
}
}

how to get array from dictionary in swift 3

I don't understand how to get array from dictionary, i have tried in this code but i want get array only content and type
This is my array
{
wsResponse = {
aarti =(
{
content = "";
identifier = "slok_one";
title = 1;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
},
{
content = "";
identifier = "slok_two";
title = 2;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
},
{
content = "";
identifier = "slok_three";
title = 3;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
}
}
);
};
Here is my code
Alamofire.request(url, method: .get, parameters: nil, encoding: JSONEncoding.default)
.responseJSON { response in
if let status = response.response?.statusCode {
switch(status){
case 201:
print("example success")
default:
print("error with response status: \(status)")
}
}
//to get JSON return value
if let array = response.result.value
{
let JSON = array as! NSDictionary
print("\(JSON)")
let response = JSON["wsResponse"] as! NSDictionary
let data = response["aarti"]
}
}
i want array from this ,like content,title,type
thank you in advance
According to the JSON this prints all values in the aarti array:
if let JSON = response.result.value as? [String:Any] {
if let response = JSON["wsResponse"] as? [String:Any],
let aarti = response["aarti"] as? [[String:Any]] {
for item in aarti {
let content = item["content"] as! String
let identifier = item["identifier"] as! String
let title = item["title"] as! Int
let type = item["type"] as! String
print(content, identifier, title, type)
}
}
}
Basically do not use NSDictionary / NSArray in Swift.
If you want to put all content values in an array use flatMap. The line can replace the whole repeat loop.
let contentArray = aarti.flatMap { $0["content"] as? String }
PS: If you are going to create multiple arrays from the values don't do that: Use a custom struct or class
if someone want to get dictionary of array and use it in tableview
declaration:
var list:[Any] = []
and initialisation :
self.list = (self.ListDic?["data"] as! NSArray!) as! [Any]
and use:
let dictObj = self.list[indexPath.row] as! NSDictionary
print("object value: ",dictObj["text"] as! String)

serializing array to object in swift

i have the following object class:
class NewsItem: NSObject {
var storyCategory: String?
var titleText: String?
var paragraph1: String?
var paragraph2: String?
var featureImage: String?
var secondImage: String?
var storyDate: String?
var majorReference: String?
var fact: String?
var actualFeatureImage: UIImage? // Using these two to pass the image from home to story view
var actualSecondImage: UIImage?
var referencesArray = [AnyObject]()
...
init?(dictionary: [String: AnyObject]) {
guard
let storyCategory = dictionary["category"] as? String,
let titleText = dictionary["title"] as? String,
let paragraph1 = dictionary["paragraph1"] as? String,
let paragraph2 = dictionary["paragraph2"] as? String,
let featureImage = dictionary["headerImage"] as? String,
let storyDate = dictionary["date"] as? String,
let majorReference = dictionary["majorReference"] as? String,
let secondImage = dictionary["secondImage"] as? String
else {
return nil
}
self.storyCategory = storyCategory
self.titleText = titleText
self.paragraph2 = paragraph2
self.paragraph1 = paragraph1
self.featureImage = featureImage
self.storyDate = storyDate
self.majorReference = majorReference
self.fact = dictionary["fact"] as? String //if there's a fact in the dict, it will be assigned and if not there'll be nil
self.secondImage = secondImage
let referenceObject = dictionary["reference"] as? [[String: AnyObject]]
for object in referenceObject! {
self.referencesArray.append(object)
//print(object)
}
//bellow is a snippet from the method that's serializing the JSON data
do {
let json = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)
if let newsArticles = json["stories"] as? [[String: AnyObject]] {
for article in newsArticles {
let newsArticle = NewsItem(dictionary: article)
newsItems.append(newsArticle!)
}
}
} catch {
print("error in the news items delivery: \(error)")
let displayError = EHPlainAlert(title: "hmmm...", message: "\(error)", type: ViewAlertError)
displayError.show()
}
}
in the backend of the app, i have JSON objects and one of the values of each of the objects is as follows:
... "reference" : [
{
"refName": "CNN",
"refURL": "http://edition.cnn.com/2016/07/19/football/brexit-effect-on-english-premier-league/index.html"
},
{
"refName": "Telegraph",
"refURL": "http://www.telegraph.co.uk/football/2016/06/21/what-would-brexit-mean-for-the-premier-league/"
}
], ...
i don't know if i have the JSON wrong o' something but what i intend to have is an array of references, each reference having a reference name(refName) and the url of the reference (refURL).
my question is, what would be the best method to have the JSON object above be added to the referencesArray in my object class. Would it be better to use a dictionary instead of an array? if so, how should i re-write my code?
if you need any more details about the code, ask and ye shall receive an update. Thanks!
EDIT
Here's the JSON in full :
{
"stories" : [
{
"title" : "English Premier League vs BREXIT: Who will win?",
"headerImage" : "http://i2.cdn.turner.com/cnnnext/dam/assets/160117112140-rooney-goal-exlarge-169.jpg",
"category" : "Sports",
"paragraph1" : "Paragraph text",
"paragraph2" : "More text goes here",
"date" : "21st July",
"majorReference" : "CNN",
"reference" : [
{
"refName": "CNN",
"refURL": "http://edition.cnn.com/2016/07/19/football/brexit-effect-on-english-premier-league/index.html"
},
{
"refName": "Telegraph",
"refURL": "http://www.telegraph.co.uk/football/2016/06/21/what-would-brexit-mean-for-the-premier-league/"
}
],
"secondImage" : "http://www.telegraph.co.uk/content/dam/football/2016/06/14/02-leicester-afp-xlarge_trans++Wy_u4a9GUNQgLIY2EGV3qvLCN329DeTLuwi-bwi35Bo.jpg",
"fact" : "Talent will go missing"
}, ...
Thats just one story... after the comma, is another story.
First, define a data model for your reference:
struct NewsItemReference {
var refName: String
var refURL: NSURL
}
Then modify your NewsItem class as below:
class NewsItem: NSObject {
var referencesArray = [NewsItemReference]()
init?(dictionary: [String: AnyObject]) {
...
if let references = dictionary["reference"] as? [[String: AnyObject]] {
for object in references {
guard let refName = object["refName"] as? String,
let refURLString = object["refURL"] as? String,
let refURL = NSURL(string: refURLString) else {
continue
}
self.referencesArray.append(NewsItemReference(refName: refName, refURL: refURL))
}
}
}
If you see yourself quickly outgrowing this model (the code is too verbose), take a look at some JSON-to-object mapping framework like ObjectMapper.

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