dataTask with NSURL instead of URL - ios

Question

I've been following an guide in the hope of learning how to use MYSQL with IOS apps.
However the guide is a little bit outdated, and I'm using swift 3 and I been editing the code to fix a few bugs.
I have come down to a final problem, which is after I changed from using URL to NSURL, I can't use the "DataTask" anymore..
I have no idea how to replace this code of line.
import Foundation
protocol HomeModelProtocol: class {
func itemsDownloaded(items: NSArray)
}
class HomeModel: NSObject, NSURLSessionDataDelegate {
//properties
weak var delegate: HomeModelProtocol!
let urlPath = "http://iosquiz.com/service.php" //this will be changed to the path where service.php lives
func downloadItems() {
let url: NSURL = NSURL(string: urlPath)!
let defaultSession = Foundation.NSURLSessionConfiguration
let task = defaultSession.dataTask(with: url) { (data, response, error) in
if error != nil {
print("Failed to download data")
}else {
print("Data downloaded")
self.parseJSON(data!)
}
}
task.resume()
}
}
func parseJSON(_ data:Data) {
var jsonResult = NSArray()
do{
jsonResult = try NSJSONSerialization.jsonObject(with: data, options: NSJSONSerialization.ReadingOptions.allowFragments) as! NSArray
} catch let error as NSError {
print(error)
}
var jsonElement = NSDictionary()
let locations = NSMutableArray()
for i in 0 ..< jsonResult.count
{
jsonElement = jsonResult[i] as! NSDictionary
let location = LocationModel()
//the following insures none of the JsonElement values are nil through optional binding
if let name = jsonElement["Name"] as? String,
let address = jsonElement["Address"] as? String,
let latitude = jsonElement["Latitude"] as? String,
let longitude = jsonElement["Longitude"] as? String
{
location.name = name
location.address = address
location.latitude = latitude
location.longitude = longitude
}
locations.addObject(location)
}

Answer 1

I have come down to a final problem, which is after I changed from using URL to NSURL, I can't use the "DataTask" anymore..
Why did you switch from URL to NSURL? That's moving in the wrong direction. URL is the Swift bridge for NSURL. It should replace NSURL in all new code.
Switch back to URL. If you must use NSURL, you'll have to add an as URL when you use it in dataTask(with:), since that method expects an URL.
There's a deeper problem here. You're using a configuration as though it were a session. Here's the code I believe you mean:
// vvv Changed NSURLSessionDataDelegate to URLSessionDataDelegate
class HomeModel: NSObject, URLSessionDataDelegate {
weak var delegate: HomeModelProtocol? // <-- Avoid ! for this
let urlPath = "http://iosquiz.com/service.php"
func downloadItems() {
let url = URL(string: urlPath)! // <-- Changed NSURL to URL
let defaultSession = URLSession.shared // <-- Use URLSession, not URLSessionConfiguration
let task = defaultSession.dataTask(with: url) { (data, response, error) in
if error != nil {
print("Failed to download data")
}else {
print("Data downloaded")
self.parseJSON(data!)
}
}
task.resume()
}
}