@interface NSUnitAngle : NSDimension <NSSecureCoding> @property (class, readonly, copy) NSUnitAngle *degrees; @property (class, readonly, copy) NSUnitAngle *arcMinutes; @property (class, readonly, copy) NSUnitAngle *arcSeconds; @property (class, readonly, copy) NSUnitAngle *radians; @property (class, readonly, copy) NSUnitAngle *gradians; @property (class, readonly, copy) NSUnitAngle *revolutions; @property (class, readonly) BOOL supportsSecureCoding; + (void)initialize; + (id)icuType; + (id)baseUnit; @end