Json parsing Swift not getting print - ios

Question

I am new to Swift. I want to fetch some json data from the server using the url. I tried many other solutions but they didn't work. I want to print the duration key (text and value) from the array and then print it in console.
The Json data is attached below
{
"status": "OK",
"rows": [
{
"elements": [
{
"duration": {
"text": "3 hours 49 mins",
"value": 13725
},
"distance": {
"text": "225 mi",
"value": 361715
},
"status": "OK"
}
]
}
],
"origin_addresses": [
"Washington, DC, USA"
],
"destination_addresses": [
"New York, NY, USA"
]
}
Attached Code
func getdatajson1(){
if let url = URL(string: "http://www.json-generator.com/api/json/get/bQywstyfkO?indent=2") {
URLSession.shared.dataTask(with: url) { data, response, error in
if let data = data {
do {
let res = try JSONDecoder().decode(Root.self, from: data)
print(res.rows)
} catch let error {
print(error)
}
}
}.resume()
}
}
struct Root: Codable {
let rows: [Root2]
}
struct Root2: Codable {
let elements: [Root3]
}
struct Root3: Codable {
let elements: [node]
}
struct node: Codable {
let duration : [valuesarray]
}
struct valuesarray: Codable {
let text : String
let value : Int
}

Answer 1

The duration is an Object and not an Array, also change your names and you can use this:
struct Root: Decodable {
let rows: [Rows]
}
struct Rows: Decodable {
let elements: [Elements]
}
struct Elements: Decodable {
let duration, distance: LocationValues
}
struct LocationValues: Decodable {
let text: String
let value: Int
}
func getdatajson1(){
if let url = URL(string: "http://www.json-generator.com/api/json/get/bQywstyfkO?indent=2") {
URLSession.shared.dataTask(with: url) { data, response, error in
if let data = data {
do {
let res = try JSONDecoder().decode(Root.self, from: data)
if let row = res.rows.first, let elements = row.elements.first {
print(elements.duration.text) //This is how you can get the text value
print(elements.distance.text) //This will print the distance
}
} catch let error {
print(error)
}
}
}.resume()
}
}

Answer 2

Replace your codable struct with the below
class Result: Codable {
var status:String?
var rows:[Row]?
var origin_addresses:[String]?
var destination_addresses:[String]?
}
class Row: Codable {
var elements:[Element]?
}
class Element: Codable {
var status:String?
var duration:Duration?
var distance:Distance?
}
class Duration: Codable {
var text:String?
var value:Int?
}
class Distance: Codable {
var text:String?
var value:Int?
}

Answer 3

You should update your node model like below
struct node: Codable {
let duration : valuesarray
let distance : valuesarray
let status : String
}
And you can access your duration data from API response like below
if let rows = res.rows, rows.count > 0 {
//Access the element objects from rows
let arrElements = rows[0].elements, arrElements.count > 0 {
if let durationData = arrElements[0].duration { //get your duration object
print(durationData.text)
print(durationData.value)
}
}
}

Answer 4

try this:
and a hint: go to https://app.quicktype.io/ -> here you can paste your json and you will get your datastructs for free! ;)
func getdatajson1(){
if let url = URL(string: "http://www.json-generator.com/api/json/get/bQywstyfkO?indent=2") {
URLSession.shared.dataTask(with: url) { data, response, error in
if let data = data {
do {
let res = try JSONDecoder().decode(Welcome.self, from: data)
print(res.rows)
} catch let error {
print(error)
}
}
}.resume()
}
}
getdatajson1()
struct Welcome: Codable {
let status: String
let rows: [Row]
let originAddresses, destinationAddresses: [String]
enum CodingKeys: String, CodingKey {
case status, rows
case originAddresses = "origin_addresses"
case destinationAddresses = "destination_addresses"
}
}
// MARK: - Row
struct Row: Codable {
let elements: [Element]
}
// MARK: - Element
struct Element: Codable {
let duration, distance: Distance
let status: String
}
// MARK: - Distance
struct Distance: Codable {
let text: String
let value: Int
}