The current tilt angle of a slat for an accessory like a window or a fan.
- iOS 10.2+
- tvOS 10.1+
- watchOS 3.1.1+
The corresponding value represents the angle in degrees, with a value between -90 and 90.
For horizontal slats, a value of -90 indicates the slats are fully closed and rotated such that the user-facing edge is higher than the opposing edge. For vertical slats, this value indicates that the user-facing edge is to the left of the opposing edge. In either case, a value of 0 indicates that the edges are aligned, with the slats fully open.