Sets the value of an instance variable in an object.
- iOS 2.0+
- macOS 10.5+
- tvOS 9.0+
- watchOS 1.0+
The object containing the instance variable whose value you want to set.
The Ivar describing the instance variable whose value you want to set.
The new value for the instance variable.
object_set is faster than
object_set if the Ivar for the instance variable is already known.