Unexpected non-void return value in void function swift 4 using json serialisation

Question

I am currently trying to clean up my code on a project by writing a generic function that can be used multiple times. However i need my function to return an array. My error is

Answer 1

You can't return data directly from an asynchronous task. Use a closure

Create a Function using a closure like.

func JSONSerialisation(JsonUrl: String, Completion block: @escaping ((NSArray) -> ())){
    let url = URL(string: JsonUrl)
    let task = URLSession.shared.dataTask(with: url!) { (data, responce, error) in
        if let e = error{
            print(e.localizedDescription)
        }
        else{
            if let content = data{
                do {
                    if let Json = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSArray{
                        block(Json)
                    }
                }
                catch let error{
                    print(error.localizedDescription)
                }
            }
        }
    }
    task.resume()
}

And Call :

JSONSerialisation(JsonUrl: "Your Url") { (json) in
    print(json)
}

This is helpful