swift - Assigning a value to an object of type AnyObject -


i have variable 

var post :anyobject?

which object got parse api call. want 

post["caption"]  = captiontextview.text

but following error message

cannot subscript value of type 'anyobject?' index of type 'string'

i figured out how value post variable. example, works fine extract value key "caption"

captiontextview.text = post!["caption"] as! string!

but don't know how change value. want change value of post variable , save can updated parse database. what's correct way this?

are sure don't want use pfobject class instead of anyobject?

var post :pfobject? post?["caption"]  = captiontextview.text

https://www.parse.com/apps/quickstart#parse_data/mobile/ios/swift/existing


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