ios - Save data from parse into a string -

i want save data parse class strings. use following code retrieving data parse class.

@ibaction func readaction(sender: uibutton) {      var tagautor = ""     var tagtext = ""      var query = pfquery(classname:"tags")     query.getobjectinbackgroundwithid("f3axazt9jo") {         (tag: pfobject?, error: nserror?) -> void in         if error == nil && tag != nil {             println(tag)              // tagautor = tag["username"]             // tagtext = tag["tagtext"]          } else {             println(error)         }     } } 

in comments there want do, in class called "tags" there 2 cols called "username" , "tagtext" want save them in 2 string variables "tagautor" , "tagtext". println(tag) printing out following:

how can save objects out of query 2 string variables?

tell compiler convert anyobject string:

if let author = tag["username"] string {     tagautor = author } 

and move definition of tagauthor can use outside function