How can I JSON object inside an array in swift4? How ca I get the response for this JSON in swift4? I am printing the location but its's getting nil.
Here its my JSON data:
{
"Details": [{
"phone":
"id":
}],
"address": [{
"location": "some location"
}]
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: []) as! [String: AnyObject]
let location = json["location"] as? [[String: AnyObject]]
print(location)
} catch {
print("error")
}
json["location"] doesn't exist and therefore is not an array. Location is inside the address array.
try
if let addressArray = json["address"] as? [[String: Any]] {
let address = addressArray.first
let location = address?["location'] as? String
print(location)
}
NOTES
In your JSON location was missing any value i.e "location": I added a String
it's better to use the Codable protocol in Swift 4
Related
I want to check city name From local JSON if found then massage show "You got it". But one problem came occurred that is I fetch data from file is successfully but I'd know how to compare it.
Here is my JSON file look like:
{
"data": [
{
"zip_code": 55001,
"latitude": 44.90717,
"longitude": -92.816193,
"city": "Afton",
"state": "MN",
"county": "Washington"
},
{
"zip_code": 55002,
"latitude": 45.513447,
"longitude": -92.894239,
"city": "Almelund",
"state": "MN",
"county": "Chisago"
}
]
}
Code is here:
func FatchingInformation(){
do {
if let file = Bundle.main.url(forResource: "Zone", withExtension: "json") {
let data = try Data(contentsOf: file)
let json = try JSONSerialization.jsonObject(with: data, options: [])
if let object = json as? [String: Any] {
// This condition work and Get JSON on Debug Area
print("Obj is ::: \(object)")
} else if let object = json as? [Any] {
// json is an array
print("Object is \(object)")
} else {
print("JSON is invalid")
}
} else {
print("no file")
}
} catch {
print(error.localizedDescription)
}
}
you are in right way on your JSON is dict of array of dictionary, you need to iterate your [String: Any] first there after check it contains array or dict then you need to follow as below
if let object = json as? [String: Any], let objectArray = object["data"] as? [[String: Any]] {
// do stuff
for getDictItems in objectArray{
if let getCityCompare = getDictItems["city"] as? String, !getCityCompare.isEmpty, getCityCompare == "Almelund"{
print("city name is \(getCityCompare)")
break
}
}
}
You ca use decodable Struct to decode json
// MARK: - Address
struct Address: Codable {
let data: [Datum]
}
// MARK: - Datum
struct Datum: Codable {
let zipCode: Int
let latitude, longitude: Double
let city, state, county: String
enum CodingKeys: String, CodingKey {
case zipCode = "zip_code"
case latitude, longitude, city, state, county
}
}
let address = try? JSONDecoder().decode(Address.self, from: jsonData)
I'm trying to convert an object to NSDictionary with an extension. It works fine but if the object contains an array, then the array does not convert to NSDictionary but to Json and that is not what I want. Because I try with this Dictionary to make a request post and the body accepts [String: Any].
My code:
struct Country: Codable {
let name: String
let cities: [City]
struct City: Codable {
let name: String
}
}
extension NSDictionary {
func encode<T>(_ value: T) throws -> [String: Any]? where T: Encodable {
guard let jsonData = try? JSONEncoder().encode(value) else { return nil }
return try? JSONSerialization.jsonObject(with: jsonData, options: .allowFragments) as? [String: Any]
}
}
Using:
let country = Country(name: "France", cities: [Country.City(name: "Paris"), Country.City(name: "Marseille")])
print(try! NSDictionary().encode(country))
Output:
["name": France, "cities": <__NSArrayI 0x600002926e60>(
{
name: "Paris",
},
{
name: "Marseille",
})
]
Expected output (what I want):
["name": France, "cities": [
[
"name": Paris,
],
[
"name": Marseille,
]
]
]
The output is correct since your result is NSDictionary and the output is the string representation (aka description) of NSDictionary. <__NSArrayI 0x600002926e60> is syntactic sugar.
By the way the expected output is invalid because the city names must be in double quotes.
The extension of NSDictionary makes no sense anyway. If you want to be able to call the method from everywhere declare a struct with a static method.
This is a swiftier version of your code. No allowFragments and all errors are thrown rather than being ignored.
struct DictionaryEncoder {
static func encode<T>(_ value: T) throws -> [String: Any] where T: Encodable {
let jsonData = try JSONEncoder().encode(value)
return try JSONSerialization.jsonObject(with: jsonData) as? [String: Any] ?? [:]
}
}
Copy the method and your structs into a Playground and run
let country = Country(name: "France", cities: [Country.City(name: "Paris"), Country.City(name: "Marseille")])
try! DictionaryEncoder.encode(country)
Don't print the result, look at the result area in the Playground, the output is exactly what you want.
You need
let res = try! JSONEncoder().encode(country)
print(res.prettyPrintedJSONString!)
extension Data {
var prettyPrintedJSONString: NSString? { /// NSString gives us a nice sanitized debugDescription
guard let object = try? JSONSerialization.jsonObject(with: self, options: []),
let data = try? JSONSerialization.data(withJSONObject: object, options: [.prettyPrinted]),
let prettyPrintedString = NSString(data: data, encoding: String.Encoding.utf8.rawValue) else { return nil }
return prettyPrintedString
}
}
Result
{
"name" : "France",
"cities" : [
{
"name" : "Paris"
},
{
"name" : "Marseille"
}
]
}
I'm trying to parse a json string:
if let jsonStr = asd.value(forKey: "orderData") as? String {
print(jsonStr)
let data = jsonStr.data(using: String.Encoding.utf8, allowLossyConversion: false)!
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! [String: AnyObject] // CRASHES HERE
if let names = json["product_name"] as? [String] {
print(names)
}
} catch let error as NSError {
print("Failed to load: \(error.localizedDescription)")
}
}
But at the line let json = try JSONSeri... it crashes saying Could not cast value of type '__NSArrayI' to 'NSDictionary'.
Also tried changing this as! [String: AnyObject] to as! [[String: AnyObject]]. But it still doesn't work.
This is my json string structure:
[
{
"product_id" : "1",
"category_json" : {
"category_id" : "1",
"category_name" : "nvm"
},
"selling_price" : "200",
"product_name" : "nvm",
},
{
"product_id" : "2",
"category_json" : {
"category_id" : "2",
"category_name" : "cas"
},
"selling_price" : "800",
"product_name" : "cas",
}
]
You should not be force casting with ! unless you are 100% sure that it will succeed.
I would suggest you use the following:
let jsonArray = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [[String: Any]]
This will return you a list of products. If you want a list of the product names than you need to iterate over it and extract the product name of each item. You can do this like so:
let names = jsonArray.map({ $0["product_name"] as? String })
As already mentioned the object is an array, you have to use a for loop to get all items
...
let data = Data(jsonStr.utf8)
do {
if let json = try JSONSerialization.jsonObject(with: data) as? [[String: Any]] {
for item in json {
if let name = item["product_name"] as? String {
print(name)
}
}
}
} catch {
print("Failed to load: \(error.localizedDescription)")
}
{
"status": true,
"status_code": 1,
"content": [
{
"cat_id": "3",
"cat_name": "Food",
"cat_parentid": "2"
},
{
"cat_id": "4",
"cat_name": "Entertainment",
"cat_parentid": "2"
},
{
"cat_id": "5",
"cat_name": "Cars",
"cat_parentid": "2"
},
{
"cat_id": "12",
"cat_name": "Personal Care",
"cat_parentid": "2"
}
],
"message": "Success"
}
UPDATE
do {
//create json object from data
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
completion((json as? AnyObject)!) //here completion callback will return the jsonObject to my UIViewController.
}
} catch let error {
print(error.localizedDescription)
}
this is my JSONObject. I am very new to the swift. how to get the content JSONArray and further process in swift.? Anybody can help me? Help will be appreciated.
This code checks if the status is true, gets the array for key content and prints all values in the array.
The array is clearly [[String:String]] so cast the object to this specific type.
do {
//create json object from data
if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any] {
if let status = json["status"] as? Bool, status == true {
if let content = json["content"] as? [[String:String]] {
for category in content {
let id = category["cat_id"]
let name = category["cat_name"]
let parentId = category["cat_parentid"]
print(id , name, parentId)
}
}
}
}
} catch let error {
print(error.localizedDescription)
}
PS: As always, never use .mutableContainers in Swift. It's meaningless
Check whether your json has content array
if let content = json["content"] as? [Dictionary<String, AnyObject>] {
print(content) // it will give you content array
}
Get content array like this:
let allContent = json["content"] as? [[String: Any]]
Full sample:
do {
//create json object from data
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
if let allContent = json["content"] as? [[String: Any]] {
for content in allContent {
let catId = content["cat_id"] as? String
let catName = content["cat_name"] as? String
let catParentId = content["cat_parentid"] as? String
print(">> catid=" + catId!)
print(">> catName=" + catName!)
print(">> catparentID=" + catParentId!)
}
}
}
} catch let error {
print(error.localizedDescription)
}
let content = dict.objectForKey("content")! as NSArray
Then you can get json of single object for parsing by
for var cat in content
{
print(cat)
}
Another alternative way, by using the library.
First, import JSON library for Swift - SwiftyJSON and use the code:
import SwiftyJSON
let json = JSON(<jsonObject data>)
let contentArray: Array<JSON> = json["content"].arrayValue
Library Integration
If you're using cocoapods then use this pod:
pod 'SwiftyJSON'
OR else just drag SwiftyJSON.swift to the project tree.
you can extract you data by providing key
if let array = result["content"] as? Array<AnyObject> {
print(arry)
}
You can access like below
if let filePath = Bundle.main.path(forResource: "sample", ofType: "json"), let data = FileManager().contents(atPath: filePath) {
do {
let dicRes = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? [String: Any]
let contentArray = dicRes?["content"]
print("contentArray == \(contentArray)")
} catch {
}
}
this post follows an old post where some people helped me for a similar problem.
I currently developing an app which list user object by making an request to a webservice, which send a response in JSON in this format :
{
"objects": [
{
"id": "28",
"title": "test",
"price": "56 €",
"description": "kiki",
"addedDate": "11-07-2015",
"user_id": "1",
"user_name": "CANOVAS",
"user_zipCode": "69330",
"category_id": "1",
"category_label": "VEHICULES",
"subcategory_id": "1",
"subcategory_label": "Voitures",
"picture": "",
"bdd": {},
"picture_url": "http://jdl-barreme-orange.dyndns.org/WEBSERVICE/pictures/test.JPG"
},
{
"id": "27",
"title": "ferrari",
"price": "55 €",
"description": "rouge jantes",
"addedDate": "11-07-2015",
"user_id": "1",
"user_name": "CANOVAS",
"user_zipCode": "69330",
"category_id": "1",
"category_label": "VEHICULES",
"subcategory_id": "1",
"subcategory_label": "Voitures",
"picture": "",
"bdd": {},
"picture_url": "http://jdl-barreme-orange.dyndns.org/WEBSERVICE/pictures/ferrari.JPG"
}
}
I search a method to retrieve for each dictionary the value title and price and put them in a tableView.
Code I used (tableviewcontroller) :
if let jsonArray = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: nil) as? [[String:AnyObject]] {
for dict in jsonArray {
if let title = dict["title"] as? String {
println(title)
}
}
}
But it doesn't work, I put a breakpoint, and Xcode stop to interpret here :
for dict in jsonArray
Thanks for your help.
This example JSON is not valid: it lacks a ] before the last }.
But I guess this is just a pasting typo and the JSON you're using is properly formatted, so your problem is that you need to first access the objects key of your dictionary.
This key holds a value of an array of dictionaries, so we're using it as a typecast:
if let json = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: nil) as? [String:AnyObject] {
if let objects = json["objects"] as? [[String:AnyObject]] {
for dict in objects {
if let title = dict["title"] as? String {
println(title)
}
}
}
}
First we cast the result of NSJSONSerialization.JSONObjectWithData as the dictionary: [String:AnyObject], then we access the value for the objects key, then we cast this value as an array of dictionaries: [[String:AnyObject]].
Remember, with JSON format, dictionaries are formatted with {} and arrays are formatted with [].
Your example is {key:[{},{}]} so it's a dictionary holding an array of dictionaries.
Update for Swift 2.0
if let json = try? NSJSONSerialization.JSONObjectWithData(urlData!, options: []) as? [String:AnyObject] {
if let objects = json?["objects"] as? [[String:AnyObject]] {
for dict in objects {
if let title = dict["title"] as? String {
print(title)
}
}
}
}
Try this :
var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(urlData, options: NSJSONReadingOptions.MutableContainers, error: nil) as! NSDictionary
var DataFromJSon = jsonResult["objects"] as! NSArray
for one in DataFromJSon {
var title = one["title"] as! String
println(title)
}