xcode - Cast JSON AnyObject to Double (Swift) -

i want cast anyobject json double in swift.

let value = double(jsonresult["counter"]) not work

let value = jsonresult["counter"] as? double not work

let value = jsonresult["counter"] as! double not work

numbers in dictionaries(/from json) nsnumber. can use (jsonresult["counter"] as? nsnumber).doublevalue. (the double type not class, can't anyobject.)

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edit: sounds server returning data as string, {"counter": "1234"}.

in case, can take advantage of nsstring method called doublevalue parses string (or can use integervalue):

if let counter = (parsejson["counter"] as? nsstring)?.doublevalue {     // }