How to get data from JSON response in iOS Swift? - json

Question

Here i have using swiftyJson pod library for response data. normal json response data i could able to get data but for complex i could not make it.
here is my code to get data from response:
private func makeHTTPGetRequest(path: String, onCompletion: #escaping ServiceResponse) {
let user = "David****"
let password = "**************"
let loginString = "\(user):\(password)"
guard let loginData = loginString.data(using: String.Encoding.utf8) else {
return
}
let base64LoginString = loginData.base64EncodedString()
print("base 64 login :\(base64LoginString)")
let headers = ["Authorization": "Basic \(base64LoginString)"]
// using URL and request getting a json
let request = URLRequest(url: NSURL(string: path)! as URL)
let config = URLSessionConfiguration.default
config.httpAdditionalHeaders = headers
let session = URLSession.init(configuration: config)
session.dataTask(with: request) { (data:Data?, response: URLResponse?, error:Error?) in
if let jsonData = data { // if data has a data and success
do {
let json: JSON = try JSON(data: jsonData)
onCompletion(json,nil)
print("json data:\(json)")
}catch {// error
onCompletion(JSON(),error)
}
} else { // if the data is nil
onCompletion(JSON(),error)
}
}.resume()
}
Used this function in viewController.swift
func addDummyData() {
// Call API
RestApiManager.sharedInstance.getRandomUser { (json:JSON) in
// return json from API
if let results = json["results"].array { // get results data from json
print("results:\(results)")
for entry in results { // save data to items.
self.items.append(UserObject(json: entry))
}
print("array= \(self.items)")
DispatchQueue.main.async { // back to the main que and reload table
self.tableView.reloadData()
}
}
}
}
Model class:
import SwiftyJSON
class UserObject {
// var pictureURL: String!
var username: String!
required init(json: JSON) {
// pictureURL = json["picture"]["medium"].stringValue
username = json["WorkOrder"].stringValue
}
}
Here is my json response:
{
"d": {
"results": [
{
"__metadata": {
"id": "http://*******:****/sap/opu/odata/sap/ZPRJ_PM_APPS_IH_SRV/WorkOrderF4Set('000000504780')",
"type": "ZPRJ_PM_APPS_IH_SRV.WorkOrderF4"
},
"WorkOrder": "000000504780",
"Description": "General Maintenance testing"
},
}
}
From json response i'm trying to get WorkOrder and Description
Any help much appreciated pls....

Answer 1

Please read the JSON carefully. The outermost object is a dictionary with a key d.
To get the results array you have to write
if let results = json["d"]["results"].array { ...
And you don't need a class and never declare properties as IUO which are initialized in an init method
struct User {
let workOrder: String
let description: String
init(json: JSON) {
workOrder = json["WorkOrder"].stringValue
description = json["Description"].stringValue
}
}
Side note: Since Swift 4 SwiftyJSON has become obsolete in favor of Codable. It's built-in and much more efficient.