componentWillMount() {
        this.panGesture = PanResponder.create({
            onMoveShouldSetPanResponder: (evt, gestureState) => {
                return (
                    this.isValid(gestureState.dx, gestureState.dy) &&
                    this.state.isTouched
                );
            },
            onPanResponderMove: (evt, gestureState) => {
                this.moveView(gestureState);
            },
            onPanResponderRelease: (evt, gestureState) => {
                this.moveFinished(gestureState);
            }
        });
    }

...

moveFinished(gestureState) {
     const position = new Animated.Value(gestureState.moveY);
     Animated.spring(position, {
        toValue: this.state.endPosition,
        useNativeDriver: true,
        velocity: gestureState.vy
     }).start();
}