ios - Swift Parse - Method doesn't stop executing -

i have following code query parse class , return result set. after returning results, pass array function check if elements set or not.

i used print statements on code try , debug, , found query executes , within

if error == nil 

i getting results array empty. hence when pass function below, never gets out of it:

func emailorusernameistaken(results: [pfobject])->int     {         /*check if username taken or if email taken*/          var preferencetaken: int = 0          if(results[0]["email"] as! string != "" && results[0]["email"] as! string == self.userobject.email!)         {             preferencetaken = 1         }else if(results[0]["appusername"] as! string != "" && results[0]["appusername"] as! string == self.userobject.username!){             preferencetaken = 2         }          return preferencetaken     } 

and code query taking place:

let query = pfquery.orquerywithsubqueries([usernameinputcheck, emailinputcheck])         query.findobjectsinbackgroundwithblock {             (results: [pfobject]?, error: nserror?) -> void in             if error == nil {                 print("before")                 let checkresult = self.emailorusernameistaken(results!)                 print(results)                 print("after")             }         } 

as output print statements above, in console:

before optional([]) after 

can me find out issue. surprised why not working.

if results empty, results[0]["email"] as! string should crash because force unwrapping nil optional value. story telling not consistent.

if actual problem empty results - have provide details queries , why expect there populated result.