Swift 3: Extra Argument 'Fehler' in Call

Question

Ich habe versucht alle Lösungen wie versuchen zu fangen. Aber nicht in der Lage, diesen Fehler zu lösen. Bitte hilf mir, ich bin neu bei ios.

func apicalling() { 

    let headers = [ 
     "content-type": "application/json", 
     "cache-control": "no-cache", 
     "postman-token": "7adebcbe-18b4-d2a7-2159-2fbcaea27edd" 
    ] 
    let parameters = [ 
     "customerID": "1", 
     "listType": "2" 
    ] 

    let postData = JSONSerialization.dataWithJSONObject(parameters, options: nil, error: nil) 



    var request = NSMutableURLRequest(url: NSURL(string: "http://exp.php")! as URL, 
             cachePolicy: .useProtocolCachePolicy,timeoutInterval: 10.0) 
    request.httpMethod = "POST" 
    request.allHTTPHeaderFields = headers 
    request.HTTPBody = postData 

    let session = URLSession.shared 
    let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in 
     if (error != nil) { 
      print(error) 
     } else { 
      let httpResponse = response as? HTTPURLResponse 
      print(httpResponse) 
     } 
    }) 

    dataTask.resume() 

     } 

Der Fehler in dieser Zeile unter:

let postData = JSONSerialization.dataWithJSONObject(parameters, options: nil, error: nil) 

Bitte helfen Sie mir.

Danke.

Answer 1

In swift 3 wird es sein:

do { 
    let data = try JSONSerialization.data(withJSONObject: parameters, options:[]) 
    // do your works 
} catch { 
    print("Got error: \(error)") 
} 

Das API Dokument ist hier: https://developer.apple.com/reference/foundation/jsonserialization/1413636-data

Answer 2

Seit Swift 3, Sie do, with try and catch, auch das error Argument hinzufügen müssen wurde gelöscht, da es Wirf jetzt einen Fehler, weil es gefangen wird.

func apicalling() { 

    let headers = [ 
     "content-type": "application/json", 
     "cache-control": "no-cache", 
     "postman-token": "7adebcbe-18b4-d2a7-2159-2fbcaea27edd" 
    ] 
    let parameters = [ 
     "customerID": "1", 
     "listType": "2" 
    ] 
    do { 
     let postData = try JSONSerialization.data(withJSONObject: parameters, options :[]) 
     let request = NSMutableURLRequest(url: NSURL(string: "http://exp.php")! as URL, 
             cachePolicy: .useProtocolCachePolicy,timeoutInterval: 10.0) 
     request.httpMethod = "POST" 
     request.allHTTPHeaderFields = headers 
     request.httpBody = postData 

     let session = URLSession.shared 
     let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in 
      if (error != nil) { 
       print(error) 
      } else { 
       let httpResponse = response as? HTTPURLResponse 
       print(httpResponse) 
      } 
     }) 

     dataTask.resume() 
    } catch { 
     print("JSON serialization failed: \(error)") 
    } 
}