Getting a JSON from the Task - json

Question

So I know how to parse JSON and retrieve a JSON from a URLRequest. What my objective is to remove this JSON file so I can manipulate it into different UIViewControllers. I have seen some stuff with completion handlers but I run into some issues, and I haven't fully understand. I feel like there is a simple answer, I am just being dumb.
How can I take this JSON outside the task and use it in other Swift files as a variable?
class ShuttleJson: UIViewController{
func getGenres(completionHandler: #escaping (_ genres: [String: Any]) -> ()) {
let urlstring = "_________"
let urlrequest = URLRequest(url: URL(string: urlstring)!)
let config = URLSessionConfiguration.default
let sessions = URLSession(configuration: config)
// request part
let task = sessions.dataTask(with: urlrequest) { (data, response, error) in
guard error == nil else {
print("error getting data")
print(error!)
return
}
guard let responseData = data else {
print("error, did not receive data")
return
}
do {
if let json = try JSONSerialization.jsonObject(with: responseData, options: []) as? [String: Any]{
//Something should happen here
}
print("no json sucks")
}
catch{
print("nah")
}
}
task.resume()
}
}

Answer 1

First of all remove the underscore and the parameter label from the completion handler. Both are useless
func getGenres(completionHandler: #escaping ([String: Any]) -> ()) {
Then replace the line
//Something should happen here
with
completionHandler(json)
and call the function
getGenres() { json in
print(json)
}
Notes:
The check guard let responseData = data else is redundant and it will never fail. If error is nil then data is guaranteed to have a value.
You should print the caught error rather than a meaningless literal string.