我无法让我的GameViewController符合FBSDKSharingDelegate,我也不知道为什么。这些是我认为它需要的功能。funcsharer(sharer:FBSDKSharing,didCompleteWithResultsresults:[NSObject:AnyObject]){}funcsharer(sharer:FBSDKSharing,didFailWithErrorerror:NSErrorPointer){}funcsharerDidCancel(sharer:FBSDKSharing){NSLog("sharecancelled")}我错过了什么吗?