The current tilt angle of a vertical slat for an accessory like a window or a fan.
- iOS 9.0+
- tvOS 10.0+
- watchOS 2.0+
The corresponding value represents the angle in degrees, with a value between -90 and 90.
A value of -90 indicates the slats are fully closed and rotated such that the user-facing edge is to the left of the opposing edge. A value of 0 indicates that the edges are aligned, with the slats fully open.