json - Swift Errors Thrown from here are not handled -

i have had code working in xcode 6 since got xcode 7 cannot figure out how fix this. let jsonresult line has error says error thrown here not handled. code below:

func connectiondidfinishloading(connection: nsurlconnection!) {      let jsonresult:nsdictionary = try nsjsonserialization.jsonobjectwithdata(self.bytes, options: nsjsonreadingoptions.mutablecontainers) as! nsdictionary      print(jsonresult)      let number:int = jsonresult["count"] as! int      print(number)      numberelements = number      let results: nsdictionary = jsonresult["results"] as! nsdictionary      let collection1: nsarray = results["collection1"] as! nsarray 

thanks

if @ definition of jsonobjectwithdata method in swift 2 throws error.

class func jsonobjectwithdata(data: nsdata, options opt: nsjsonreadingoptions) throws -> anyobject 

in swift 2 if function throws error have handle do-try-catch block

here how works

func connectiondidfinishloading(connection: nsurlconnection!) {     {         let jsonresult:nsdictionary = try nsjsonserialization.jsonobjectwithdata(self.bytes, options: nsjsonreadingoptions.mutablecontainers) as! nsdictionary         print(jsonresult)          let number:int = jsonresult["count"] as! int          print(number)          numberelements = number          let results: nsdictionary = jsonresult["results"] as! nsdictionary          let collection1: nsarray = results["collection1"] as! nsarray     } catch {         // handle error     } } 

or if don't want handle error can force try! keyword.

let jsonresult:nsdictionary = try! nsjsonserialization.jsonobjectwithdata(self.bytes, options: nsjsonreadingoptions.mutablecontainers) as! nsdictionary         print(jsonresult) 

as other keywords ends ! risky operation. if there error program crash.