json - Data taking too long to load when loading UITableView from a NSURLConnection -


my app displays information stored on our server, updated constantly. therefore when browsing data load each page data retrieved using following class

public class getremotedata {    class func getdatafromserver(success: ((svrdata: nsdata!) -> void)) {     //set http connection settings     let httpmethod = "get"     let timeout = 10     let url = nsurl(string: viewcontroller.gvariables.gurl)     let urlrequest = nsmutableurlrequest(url: url!,         cachepolicy: .reloadignoringlocalandremotecachedata,         timeoutinterval: 10.0)     let queue = nsoperationqueue()     //initiate connection server     nsurlconnection.sendasynchronousrequest(         urlrequest,         queue: queue,         completionhandler: {(response: nsurlresponse!,             data: nsdata!,             error: nserror!) in             //if data recieved load svrdata             if data.length > 0 && error == nil{                 let json = nsstring(data: data, encoding: nsasciistringencoding)                 if let urldata = json {                     let data = json!.datausingencoding(nsutf8stringencoding)                     success(svrdata: data)             }             }else if data.length == 0 && error == nil{                 viewcontroller.gvariables.gerror = "no data recieved, please check connection"             } else if error != nil{                 viewcontroller.gvariables.gerror = "error occurred - \(error), please check connection"             }         }     )   } }

the data loads lot of time moving between viewcontrollers use class particularly when moving backwards first pass through drops through sendasynchronousrequest without success. viewcontroller carry on , displays blank table. above code runs on thread again time , data appears can take 30 seconds! code below used viewcontroller in viewdidload

getremotedata.getdatafromserver { (svrdata) -> void in     let jsondict =    nsjsonserialization.jsonobjectwithdata(svrdata, options: nil, error: nil) as! nsdictionary     if (viewcontroller.gvariables.gerror != "") {          let alertcontroller = uialertcontroller(title: "warning", message:          viewcontroller.gvariables.gerror, preferredstyle: uialertcontrollerstyle.alert)          alertcontroller.addaction(uialertaction(title: "ok", style: uialertactionstyle.default,handler: nil))            alertcontroller.presentviewcontroller(alertcontroller, animated: true, completion: nil)     }     if let items = jsondict["products"] as? nsarray {          jsonitem in items {              if let name = jsonitem.valueforkey("name") as? string              {                  self.brandnames.addobject(name)              }              if let code = jsonitem.valueforkey("code") as? string              {                  self.brandcodes.addobject(code)              }                                  }      }      self.tableview.reloaddata() }

could please tell me how can overcome time delay issue

both of above responses resolved problem enabling json code run on main thread


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