System/Library/PrivateFrameworks/SpringBoard.framework

SBSwipeMetric.h

NSObject
>
SBAnalyticsStateMachineEventHandler

@interface SBSwipeMetric : SBAnalyticsStateMachineEventHandler {
    struct CGPoint { double x; double y; } _initialLocation;
    long long _interfaceOrientation;
    double _timestampDelta;
}

- (id)init;

@end