how to pass variable value to outside of URLSession async - swift 3

Question

I have this code :

let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
    if error != nil {
              


        

Answer 1

I would suggest to use a completion handler.

func foo(withCompletion completion: (String?, Error?) -> Void) {
    let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
        if error != nil {
            completion(nil, error)
            return    
        }    

        do {        
            let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

            if let parseJSON = json {        
                let details = parseJSON["detail"] as? String

                completion(details, nil)        
            } // parse json end    
        } // do end                
        catch {         
            completion(nil, error)  
        }   
    } // let task end
}