ios - Swift NSURL nil when running the application -

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when run application xcode told me unexpectedly found nil while unwrapping optional value @ url url isn't nil, can help?

here code 

import foundation  protocol weatherundergroundservicebygeographicaldelegate{      func setweatherbygeographical(weather:weatherunderground) }  class weatherundergoundservicebygeographical{      var delegate:weatherundergroundservicebygeographicaldelegate?      func getweatherfromweatherunderground(latitude:double, longitude:double){          let path = "http://api.wunderground.com/api/48675fd2f5485cff/conditions/geolookup/q/\(latitude,longitude).json"         let url = nsurl(string: path)           //session         let session = nsurlsession.sharedsession()   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~error @ here~~~~~~~~~~~~~~~~~~~~~~~~~         let task = session.datataskwithurl(url!) { (data:nsdata?, response:nsurlresponse?, error:nserror?) -> void in //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~              let json = json(data: data!)             //parsing json weather condition weather api. using swiftyjson             let name = json["current_observation"]["display_location"]["city"].string             let temp = json["current_observation"]["temp_c"].double             let windsp = json["current_observation"]["wind_mph"].double              //prasing weather data             let weather = weatherunderground(cityname: name!, temperature: temp!, windspeed: windsp!)              if self.delegate != nil{                 dispatch_async(dispatch_get_main_queue(), { () -> void in                      self.delegate?.setweatherbygeographical(weather)                  })             }         }         task.resume()     }   }

you have error in path string, try this:

let path = "http://api.wunderground.com/api/48675fd2f5485cff/conditions/geolookup/q/\(latitude),\(longitude).json"

the reason interpolating tuple value \(latitude,longitude) in string, adds space , makes url string invalid because space not percent-escaped. instead have interpolate each value comma between them: \(latitude),\(longitude)


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