ios - How to pass swift enum with @objc tag -

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i need define protocol can called in class use objective-c type

but doing doesn't work:

enum newscellactiontype: int {     case vote = 0     case comments     case time }  @objc protocol newscelldelegate {     func newscelldidselectbutton(cell: newscell, actiontype: newscellactiontype) }

you error 

swift enums cannot represented in objective-c

if don't put @objc tag on protocol it'll crash app it's called in class adopt protocol , inherit objective-c type class (like uiviewcontroller).

so question is, how should declare , pass enum @objc tag?

swift enums different obj-c (or c) enums , can't passed directly obj-c.

as workaround, can declare method int parameter.

func newscelldidselectbutton(cell: newscell, actiontype: int)

and pass newscellactiontype.vote.toraw(). won't able access enum names obj-c though , makes code more difficult.

a better solution might implement enum in obj-c (for example, in briding header) because automatically accessible in swift , possible pass parameter.

edit

it not required add @objc use obj-c class. if code pure swift, can use enums without problems, see following example proof:

enum newscellactiontype : int {     case vote = 0     case comments     case time }  protocol newscelldelegate {     func newscelldidselectbutton(cell: uitableviewcell?, actiontype: newscellactiontype    ) }  @uiapplicationmain class appdelegate: uiresponder, uiapplicationdelegate, newscelldelegate {      var window: uiwindow?      func application(application: uiapplication, didfinishlaunchingwithoptions launchoptions: nsdictionary?) -> bool {         self.window = uiwindow(frame: uiscreen.mainscreen().bounds)          self.window!.backgroundcolor = uicolor.whitecolor()         self.window!.makekeyandvisible()          test()          return true;     }      func newscelldidselectbutton(cell: uitableviewcell?, actiontype: newscellactiontype) {         println(actiontype.toraw());     }      func test() {         self.newscelldidselectbutton(nil, actiontype: newscellactiontype.vote)     } }

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