¿Cómo puedo obtener los datos de NSURLSession.sharedSession().dataTaskWithRequest?
class PostFOrData {
let url = NSURL( string: "http://210.61.209.194:8088/SmarttvWebServiceTopmsoApi/GetReadlist")
var picUrl = NSURL(string : "http://210.61.209.194:8088/SmarttvMedia/img/epi00001.png")
var responseString : NSString = ""
func forData() -> NSString {
let request = NSMutableURLRequest( URL: url!)
request.HTTPMethod = "POST"
var s : NSString = ""
let postString : String = "uid=59"
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
if error != nil {
println("error=\(error)")
return
} else {
println("response = \(response!)")
self.responseString = NSString(data: data, encoding: NSUTF8StringEncoding)!
println("responseString = \(self.responseString)")
}
}
// I want to return NSString here, but I always get nothing
return self.responseString
}
}
¿Alguien sabe cómo obtener los datos de la tarea?
Aceptado
No puede devolver datos directamente desde una tarea asincrónica.
La solución con Swift 2 es crear un controlador de finalización como este:
class PostFOrData {
// the completion closure signature is (NSString) -> ()
func forData(completion: (NSString) -> ()) {
if let url = NSURL(string: "http://210.61.209.194:8088/SmarttvWebServiceTopmsoApi/GetReadlist") {
let request = NSMutableURLRequest( URL: url)
request.HTTPMethod = "POST"
let postString : String = "uid=59"
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
if let data = data,
jsonString = NSString(data: data, encoding: NSUTF8StringEncoding)
where error == nil {
completion(jsonString)
} else {
print("error=\(error!.localizedDescription)")
}
}
task.resume()
}
}
}
let pfd = PostFOrData()
// you call the method with a trailing closure
pfd.forData { jsonString in
// and here you get the "returned" value from the asynchronous task
print(jsonString)
}
De esa manera, solo se llama a la finalización cuando se completa la tarea asincrónica. Es una forma de "devolver" los datos sin necesidad de utilizarlos return.
Versión rápida 3
class PostFOrData {
// the completion closure signature is (String) -> ()
func forData(completion: @escaping (String) -> ()) {
if let url = URL(string: "http://210.61.209.194:8088/SmarttvWebServiceTopmsoApi/GetReadlist") {
var request = URLRequest(url: url)
request.httpMethod = "POST"
let postString : String = "uid=59"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: request) {
data, response, error in
if let data = data, let jsonString = String(data: data, encoding: String.Encoding.utf8), error == nil {
completion(jsonString)
} else {
print("error=\(error!.localizedDescription)")
}
}
task.resume()
}
}
}
let pfd = PostFOrData()
// you call the method with a trailing closure
pfd.forData { jsonString in
// and here you get the "returned" value from the asynchronous task
print(jsonString)
}
