Swift cannot convert json array to a NSArray - json

Question

I am trying to get a json data from webpage and put it into my app. I have search so many things online and do not find any of them solve my problem.
The sample json is here
[{"id":"1","name":"Clean Archutecture","ISBN":"9780134494166","phone":null,"email":null,"comment":null,"last_update":"2018-03-10 22:53:29","price":"40","type":"sell"},{"id":"2","name":"Math Book","ISBN":null,"phone":null,"email":null,"comment":null,"last_update":"2018-03-10 22:53:54","price":null,"type":"want"},{"id":"3","name":"abc","ISBN":null,"phone":"hi","email":null,"comment":null,"last_update":"2018-03-11 19:58:00","price":"14.5","type":"want"},{"id":"4","name":"asd","ISBN":"1234","phone":"546","email":"dgf#asdc.com","comment":"234","last_update":"2018-03-11 19:59:57","price":"123","type":"want"}]
Swift code:
import Foundation
import UIKit
class Books: NSObject{
let urlRootPath = "http://maichongju.com/dbbs.php"
let method = "GET" //This is design for the php
func getData(type:String){
var result = NSArray()
let urlPath: String = urlRootPath+"?method=GET&size=ALL"
let url: URL = URL(string: urlPath)!
let request: NSMutableURLRequest = NSMutableURLRequest(url: url)
request.httpMethod = "GET"
let task = URLSession.shared.dataTask(with: request as URLRequest){
data,response, error in
if error != nil{
print("error:!! \(String(describing: error))")
return
}
do {
result = try JSONSerialization.jsonObject(with: data!, options:JSONSerialization.ReadingOptions.allowFragments) as! NSArray
print(result )
}catch {
print(error)
}
//print(result)
}
task.resume()
}
}
Error message is
Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around
character 0." UserInfo={NSDebugDescription=Invalid value around
character 0.}
I have double check my json data, i put it into online json view and it show perfectly fine. And I really dont know how to fix this problem

Answer 1

You don't need to force cast json response
do like this:
jsonResponse = try JSONSerialization.jsonObject(with: data!, options: .allowFragments)
Convert it like this as this is Array of Dictioanry objects
if let responseArray: [[String:Any]] = jsonResponse as? [[String:Any]] {
// DO HERE
}
I hope this will work for you
For safe side you https://github.com/Alamofire/Alamofire for Network request and for JSON : https://github.com/SwiftyJSON/SwiftyJSON
Update:
let urlPath: String = urlRootPath+"?method=GET&size=ALL"
i think is incorrect, In your body you have added POST but in URL you are appending method=GET
request.httpMethod = "POST"