if (this.__isNative) {
      NativeAnimatedAPI.getValue(this.__getNativeTag(), value => {
        this._value = value - this._offset;
      });
    }
Standard value for driving animations.  One `Animated.Value` can drive
multiple properties in a synchronized fashion, but can only be driven by one
mechanism at a time.  Using a new mechanism (e.g. starting a new animation,
or calling `setValue`) will stop any previous ones.

See https://reactnative.dev/docs/animatedvalue