@class NSObject; @protocol OS_dispatch_queue, WFScreenOnObserverDelegate; @interface WFScreenOnObserver : NSObject @property (nonatomic) int token; @property (retain, nonatomic) NSObject<OS_dispatch_queue> *queue; @property (readonly, nonatomic) BOOL screenOn; @property (weak, nonatomic) id<WFScreenOnObserverDelegate> delegate; - (id)init; - (void)start; - (void)stop; - (void)stateChanged:(BOOL)a0; - (void).cxx_destruct; @end