@class HKQuantitySample; @protocol NTKHeartRateModelDelegate; @interface NTKHeartRateModel : NSObject <NTKHeartRateQueryObserver> @property (retain, nonatomic) HKQuantitySample *mostRecentHeartRate; @property (readonly, weak, nonatomic) id<NTKHeartRateModelDelegate> delegate; - (void).cxx_destruct; - (id)initWithDelegate:(id)a0; - (void)manager:(id)a0 receivedLatestHeartRateSample:(id)a1; @end