Access array of dictionaries Swift 3 - ios

Question

I need to access the work data which is inside an array of dictionaries and I'm a little bit confuse with this. I'm using swift 3. Some one can give-me some piece of coding to make it done?
I'm using this
let work: NSArray! = fbData.value(forKey: "work") as! NSArray
if let position: NSArray = work[0] as! NSArray {
let positionName: String = position.value(forKey: "name") as! String
self.userWorkExpLabel.text = "\(positionName)" as String
}
but I'm having this answer:
Could not cast value of type '__NSDictionaryI' (0x1106c7288) to 'NSArray' (0x1106c6e28).
there's the API
{
"work": [
{
"employer": {
"id": "93643283467",
"name": "Oracast"
},
"location": {
"id": "111983945494775",
"name": "Calgary, Alberta"
},
"position": {
"id": "146883511988628",
"name": "Mobile Developer"
},
"start_date": "2017-04-30",
"id": "1446626725564198"
}
],
Ok guys. I tried what you posted and what I have now is something like this:
a structs class:
import Foundation
struct Worker{
let employer: Employer
let location: Location
let position: Position
let startDate:String
let id: String
init?(fromDict dict: Dictionary<String, Any>){
guard let employer = Employer(fromDict: dict["employer"] as? Dictionary<String, String>),
let location = Location(fromDict: dict["location"] as? Dictionary<String, String>),
let position = Position(fromDict: dict["position"] as? Dictionary<String, String>),
let startDate = dict["start_date"] as? String,
let id = dict["id"] as? String else {
return nil
}
self.employer = employer
self.location = location
self.position = position
self.startDate = startDate
self.id = id
}
}
struct Employer{
let id: String
let name: String
init?(fromDict dict:Dictionary<String, String>?){
guard let id = dict?["id"],
let name = dict?["name"] else{
return nil
}
self.id = id
self.name = name
}
}
struct Location {
let id:String
let name:String
init?(fromDict dict:Dictionary<String, String>?) {
guard let id = dict?["id"],
let name = dict?["name"] else {
return nil
}
self.id = id
self.name = name
}
}
struct Position {
let id:String
let name:String
init?(fromDict dict:Dictionary<String, String>?) {
guard let id = dict?["id"],
let name = dict?["name"] else {
return nil
}
self.id = id
self.name = name
}
}
Ive created a class called facebookGraphRequest.
import Foundation
import UIKit
import FBSDKCoreKit
import FBSDKLoginKit
import FBSDKShareKit
class facebookGraphRequest: NSObject {
class func graphRequestWork(completion: #escaping(_ error: Error?, _ facebookUserWork: Worker)-> Void){
if ((FBSDKAccessToken.current()) != nil){
let parameters = ["fields": "name, picture.width(198).height(198), location{location}, work{employer}, education, about, id"]
let graphRequest: FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: parameters)
graphRequest.start { (connection, result, error) in
if ((error) != nil ){
print(error!)
}else {
print(result!)
func workersArray(data:Dictionary<String, Any>)->[Worker]?{
guard let arrayOfDict = data["work"] as? Array<Dictionary<String, Any>> else {
return nil
}
return arrayOfDict.flatMap({ Worker(fromDict: $0)})
}
}
}
}
}
}
and I'm calling this data inside the viewController with:
func facebookLogin(){
facebookGraphRequest.graphRequestWork { (error: Error?, facebookUserWork: Worker) in
self.userNameJobPositionLabel.text = "\(facebookUserWork.position)"
self.companyNameLabel.text = "\(facebookUserWork.employer)"
}
}
Somebody knows what's happening? There's nothing happening with the labels.
I thought this apis was easier than that. I'm really confused with this process... Sorry if it looks like stupid questions but I'm really messing my mind because of this things... I really need your help guys. My work depends on that :(

Answer 1

After experimenting with Swift 4 and going in the direction that #PuneetSharma demonstrated I found it's even easier when you use raw JSON text, Codable, and JSONDecoder:
import Foundation
// define the nested structures
struct Work: Codable {
let work: [Worker]
}
struct Worker: Codable {
let employer: Employer
let location: Location
let position: Position
let startDate: String
let id: String
// needed a custom key for start_date
enum CodingKeys : String, CodingKey {
case employer, location, position, startDate = "start_date", id
}
}
struct Employer: Codable {
let id: String
let name: String
}
struct Location: Codable {
let id: String
let name: String
}
struct Position: Codable {
let id: String
let name: String
}
// turn the text into `Data` and then
// decode as the outermost structure
if let jsonData = json.data(using: .utf8),
let work = try? JSONDecoder().decode(Work.self, from: jsonData) {
print(work)
}
The result is a Work structure with all the data:
Work(work: [
Model.Worker(employer : Model.Employer(id : "93643283467",
name: "Oracast"),
location : Model.Location(id : "111983945494775",
name: "Calgary, Alberta"),
position : Model.Position(id : "146883511988628",
name: "Mobile Developer"),
startDate: "2017-04-30",
id : "1446626725564198")
])
(I formatted the output a bit to clarify the structures produced.)
You get a lot of functionality for free just by using Codable. It's also simple to go the other way and produce JSON text from any of the structures.

Answer 2

You should ideally introduce model classes like this:
struct Worker {
let employer:Employer
let location:Location
let position:Position
let startDate:String
let id:String
init?(fromDict dict:Dictionary<String, Any>) {
guard let employer = Employer(fromDict: dict["employer"] as? Dictionary<String, String>), let location = Location(fromDict: dict["location"] as? Dictionary<String, String>), let position = Position(fromDict: dict["position"] as? Dictionary<String, String>), let startDate = dict["start_date"] as? String, let id = dict["id"] as? String else {
return nil
}
self.employer = employer
self.location = location
self.position = position
self.startDate = startDate
self.id = id
}
}
struct Employer {
let id:String
let name:String
init?(fromDict dict:Dictionary<String, String>?) {
guard let id = dict?["id"], let name = dict?["name"] else {
return nil
}
self.id = id
self.name = name
}
}
struct Location {
let id:String
let name:String
init?(fromDict dict:Dictionary<String, String>?) {
guard let id = dict?["id"], let name = dict?["name"] else {
return nil
}
self.id = id
self.name = name
}
}
struct Position {
let id:String
let name:String
init?(fromDict dict:Dictionary<String, String>?) {
guard let id = dict?["id"], let name = dict?["name"] else {
return nil
}
self.id = id
self.name = name
}
}
Now, you can introduce a function like this:
func workersArray(data:Dictionary<String, Any>)->[Worker]?{
guard let arrayOfDict = data["work"] as? Array<Dictionary<String, Any>> else {
return nil
}
return arrayOfDict.flatMap({ Worker(fromDict: $0)})
}

Answer 3

Use this code
if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any] {
if let workArray = json["work"] as? [[String: Any]] {
if let dictWork = workArray.first {
if let dictPosition = dictWork["position"] as? [String: String] {
print("position name : \(dictPosition["name"])")
}
}
}
}