Returns a Boolean value that indicates whether the receiver has at least one member in a given character plane.
- iOS 2.0+
- macOS 10.2+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
A character plane.
true if the receiver has at least one member in
This method makes it easier to find the plane containing the members of the current character set. The Basic Multilingual Plane (BMP) is plane