Swift - How to init an array in struct? - swift

Question

I'm not sure how to init the array in Struct. I'm not able to fetch data from array, meanwhile I was manage to get the result from object (platform.status).
Am I init it wrongly ?
Any ideas ?
Here is Network Request :
func fetchServicePlatform(token: String, _key: String) {
let selectedUrl = URL(string: "\(mainUrl)/get_service")
let parameters: [String: String] = ["_key": _key]
var serviceList = [ServiceList]()
URLSession.shared.dataTask(with: setupURLRequest(selectedURL: selectedUrl!, parameters: parameters, token: token, email: "test#gmail.com")) { (data, response, error) in
if let err = error {
print("Failed to fetch API: \(err.localizedDescription)")
}
guard let data = data else { return }
do {
guard let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] else { return }
let platform = Platform(json: json)
if platform.status == "success" {
self.serviceList = platform.service_list
DispatchQueue.main.async {
self.collectionView.reloadData()
}
}
} catch let jsonErr {
print("Failed to fetch service platform: ", jsonErr.localizedDescription)
}
}.resume()
}
Here is JSON :
{
"status": "pass",
"service_list": [
{
"title": "Plumber",
"description": "Plumber",
"image": "https://s3-ap-southeast-1.heroku.com.png"
},
{
"title": "Cleaner",
"description": "Cleaner",
"image": "https://s3-ap-southeast-1.heroku.com.png"
}
]
}
Here is Struct :
struct Platform {
let service_list: [ServiceList]
let status: String
init(json: [String: Any]) {
service_list = [ServiceList(json: json["service_list"] as? [String: Any] ?? [:])]
status = json["status"] as? String ?? ""
}
}
struct ServiceList {
let title: String
let description: String
let image: String
init(json: [String: Any]) {
title = json["title"] as? String ?? ""
description = json["description"] as? String ?? ""
image = json["image"] as? String ?? ""
}
}

Answer 1

In your data json["service_list"] is an array of dictionaries,
You Can try out.
struct Platform {
var service_list: [ServiceList] = []
var status: String
init(json: [String: Any]) {
if let jsonArray = json["service_list"] as? [[String: Any]] {
for service in jsonArray {
service_list.append(ServiceList(json: service))
}
}
else{
service_list = []
}
status = json["status"] as? String ?? ""
}
}

Answer 2

init an array in the struct
struct MyData {
var dataArray:[Any] = []
var latitude: Float
var longitude: Float
}

Answer 3

You have to unwrap the dictionary as an array of dictionaries and then loop through it with a map or flatmap, where you use the value $0 as the value
guard let serviceList = (json["service_list"] as? [[String: Any]])?.flatmap({ServiceList(withDictionary: $0)})

Answer 4

Go with the below approach, this way it is simpler
Create your structure with Codable
struct Platform: Codable {
let service_list: [ServiceList]
let status: String
enum CodingKeys: String, CodingKey {
case service_list, status
}
}
struct ServiceList: Codable {
let title: String
let description: String
let image: String
enum CodingKeys: String, CodingKey {
case title, description, image
}
}
Your json data object
let json = """
{
"status": "pass",
"service_list": [
{
"title": "Plumber",
"description": "Plumber",
"image": "https://s3-ap-southeast-1.heroku.com.png"
},
{
"title": "Cleaner",
"description": "Cleaner",
"image": "https://s3-ap-southeast-1.heroku.com.png"
}
]
}
""".data(using: .utf8)!
Use the JSONDecoder to map the json object to structure
let decoder = JSONDecoder()
let platform = try! decoder.decode(Platform.self, from: json)
if platform.status == "pass"{
for service in platform.service_list{
print(service.title)
}
}