ios - How to call protocol from another viewcontroller? -

i want call protocol viewcontroller viewcontroller. got error below:

type 'hello' not conform protocol 'loginpagevcdelegate'

here protocol in loginpagevc

protocol loginpagevcdelegate {     func onloginfacebook(loginviewcontroller : loginpagevc!) } 

and here how call

class hello : uiviewcontroller, loginpagevcdelegate {    .... } 

what did wrong? how can fix it?

you should not call here instead implement it:

class hello : uiviewcontroller, loginpagevcdelegate {     func onloginfacebook(loginviewcontroller: loginpagevc!) {      } }