ios - JSON Parsing error with Swift -

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i'm new in ios programming , i'm trying new language swift. i've problem / don't know how in parsing json swift ios use. used json in android, know json , link right, when try code below (seen in tutorial) app seems crash , highlighted line:

var jsonresult = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.mutablecontainers, error: &err) nsdictionary

the console gives me error:

the operation couldn’t completed. (nsurlerrordomain error -1005.) fatal error: unexpectedly found nil while unwrapping optional value

here entire code of button's action:

let urlasstring = "http://xxxxxxxxxx.altervista.org/app/_dd_/downloadutenti.php?email="+campoemail.text+"&password="+campopassword.text     let url = nsurl(string: urlasstring)!     let urlsession = nsurlsession.sharedsession()      println(url)     println(urlsession)     let jsonquery = urlsession.datataskwithurl(url, completionhandler: { data, response, error -> void in         if (error != nil) {             println(error.localizeddescription)         }         var err: nserror?          if(data != nil){             var jsonresult = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.mutablecontainers, error: &err) nsdictionary           if (err != nil) {             println("json error \(err!.localizeddescription)")         }              var jsonemail = ""             if var jsonemail: string! = jsonresult["email"] as? nsstring{              }             else{                 println("problem 1")             }              var jsonpassword = ""             if var jsonpassword: string! = jsonresult["pass"] as? nsstring{              }             else{                 println("problem 2")             }          dispatch_async(dispatch_get_main_queue(), {             self.scritta2.text = "email: " + jsonemail + " - password: " + jsonpassword         })     }     })     jsonquery.resume()

n.b. use xcode6 simulator , know sure "variables" campoemail.text , campopassword.text taken in way.

json should give back:

[{"id":"1","email":"lincoln@gmail.com","password":"pass","permessi":"1","stato":"italia","citta":"palermo","via":"via lincoln, 29","cap":"90100","telefono":"091xxxxxx"}]

edit @neo help: edited action of button this, code goes data's null check..

let cururl: nsurl = nsurl(string: "http://fantacharleston.altervista.org/app/_dd_/downloadutenti.php?email=lincoln@gmail.com&password=pass")!         let currequest: nsurlrequest = nsurlrequest(url: cururl, cachepolicy: nsurlrequestcachepolicy.reloadignoringlocalandremotecachedata, timeoutinterval: 60)         nsurlconnection.sendasynchronousrequest(currequest, queue: nsoperationqueue.mainqueue()) { (response: nsurlresponse!, data: nsdata?, error: nserror!) -> void in              if (data != nil) {                 if let jsonarray: nsarray = nsjsonserialization.jsonobjectwithdata(data!, options: nsjsonreadingoptions.mutablecontainers, error: nil) nsarray? {                      let jsonobject: nsdictionary? = jsonarray.objectatindex(0) as? nsdictionary                     if (jsonobject != nil) {                         nslog("object: %@", jsonobject!)                         let email: nsstring? = jsonobject?.objectforkey("email") as? nsstring                         let password: nsstring? = jsonobject?.objectforkey("password") as? nsstring                          if (email != nil && password != nil) {                             dispatch_async(dispatch_get_main_queue(), { () -> void in                                 self.scritta2.text = "email: " + email! + " - password: " + password!                             })                         }                       }                  }             }             else{                 println("null")             }         }

yes think know problem is... trying put jsonarray nsdictionary... cant go... trying put jsonobject in java.

just exchange nsdictionary nsarray , sure properties array[0]["key"], not array["key"], because working array, not dictionary... (its arraylist, , hashmap in java)

try please...

if let jsonresult: nsarray = nsjsonserialization.jsonobjectwithdata(data, options: nsjsonreadingoptions.mutablecontainers, error: &err) nsarray? {  let jsonemail: nsstring? = jsonresult.objectatindex(0).objectforkey("email")  }

edit code need

here is... wrote bit write in java android... think it... problem commented maybe there no "pass" tag in json... "password"...

let cururl: nsurl = nsurl(string: "http://fantacharleston.altervista.org/app/_dd_/downloadutenti.php?email=lincoln@gmail.com&password=pass")!         let currequest: nsurlrequest = nsurlrequest(url: cururl, cachepolicy: nsurlrequestcachepolicy.reloadignoringlocalandremotecachedata, timeoutinterval: 60)         nsurlconnection.sendasynchronousrequest(currequest, queue: nsoperationqueue.mainqueue()) { (response: nsurlresponse!, data: nsdata?, error: nserror!) -> void in              if (data != nil) {                 if let jsonarray: nsarray = nsjsonserialization.jsonobjectwithdata(data!, options: nsjsonreadingoptions.mutablecontainers, error: nil) nsarray? {                      let jsonobject: nsdictionary? = jsonarray.objectatindex(0) as? nsdictionary                     if (jsonobject != nil) {                         nslog("object: %@", jsonobject!)                         let email: nsstring? = jsonobject?.objectforkey("email") as? nsstring                         let password: nsstring? = jsonobject?.objectforkey("password") as? nsstring                          if (email != nil && password != nil) {                             dispatch_async(dispatch_get_main_queue(), { () -> void in                                 self.scritta2.text = "email: " + email + " - password: " + password                             })                         }                       }                  }             }         }

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