Wie man globale Funktion für REST APIs durch nsurlsession in swift iOS macht?

Question

Wie kann ich eine Funktion zum Aufruf RESTful API durch NSURLSESSION, die auf jedem Controller in schnellen iOS, d. H. Singleton-Objekt für überall in der App Dies ist der Code, den ich kam. Aber sobald ich die Methode aufruft, stürzt es ab, bis die jsonresponse leer ist.

func apicall (mainurl : String, method :String,params :String) -> NSDictionary{ 

    var jsonresponse = NSDictionary() 
    let url:NSURL = NSURL(string: mainurl)! 
    let session = NSURLSession.sharedSession() 

    let request = NSMutableURLRequest(URL: url) 
    request.HTTPMethod = method 
    //  request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringCacheData 

    let paramString = params 
    request.HTTPBody = paramString.dataUsingEncoding(NSUTF8StringEncoding) 

    let task = session.dataTaskWithRequest(request) { 
     (
     let data, let response, let error) in 
     enum JSONError: String, ErrorType { 
      case NoData = "ERROR: no data" 
      case ConversionFailed = "ERROR: conversion from JSON failed" 
     } 
     do{ 
      guard let _:NSData = data, let _:NSURLResponse = response where error == nil else { 
       print("error") 
       throw JSONError.NoData 
      } 
      print("data = \(data), response = \(response) , error = \(error)") 


      guard let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary else { 
       throw JSONError.ConversionFailed 
      } 
      jsonresponse = json 

     } 
     catch let error as JSONError { 
      print(error.rawValue) 
     } catch let error as NSError { 
      print(error.debugDescription) 
     } 
    } 
    task.resume() 

    return jsonresponse 
} 

}

Answer 1

NSUrlSession Reference

1.Shared seesion Rückkehr Standardsitzung des Singleton-Objekt. Wenn Sie eine eigene Sitzung verwenden möchten, erstellen Sie eine Methode für die Rückgabe des Singletons der Sitzung.

func restAPICall(requestUrl:NSURL, httpMethod:String, params:NSDictionary) 
     { 
      let session = NSURLSession.sharedSession() 
      var dataTask: NSURLSessionDataTask; 
      do 
      { 
       let httpData = try NSJSONSerialization.dataWithJSONObject(params, options: .PrettyPrinted) 
       let request = NSMutableURLRequest.init(URL: requestUrl) 
       request.addValue("application/json", forHTTPHeaderField: "Content-Type"); 
       request.HTTPBody = httpData 
       request.HTTPMethod = "POST" 

       dataTask = session.dataTaskWithRequest(request){(data, response, error) in 

        do 
        { 
         let jsonData = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) 
         print("\(ViewController.count)----------\n" + jsonData.description + "\n--------------\n"); 
         ViewController.count = ViewController.count + 1 

        } 
        catch 
        { 
         print(error) 
        } 
       } 


       dataTask.resume(); 
      } 
      catch 
      { 
       print(error) 
      } 
     }