does not conform to protocol Swift Parent Class - Objective C Protocol -

i trying call protocol class in swift, giving me error

"type swiftviewcontroller not conform protocol abcdelegate.

could please tell me missing , find other posts , nothing explained , let me know if need more info.

@protocol abcdelegate <nsobject> @required - (void) abc:(nsstring*)messageresponsestr @end @interface abc : nsobject  @property (nonatomic, assign) id<abcdelegate> delegate; @property(nonatomic,retain)nsstring *responsestr; -(void)network:(int)networkstate  

a protocol defines abstract behaviour.

like interface in many other languages. abcdelegateprotocol states: implement me, need specify following required methods, , can choose implement following optional methods.

in case, class need implement protocol required abc method.