A universally unique identifier, as defined by Bluetooth standards.
- iOS 5.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Bluetooth
Instances of the
CBUUID class represent the 128-bit universally unique identifiers (UUIDs) of attributes used in Bluetooth low energy communication, such as a peripheral’s services, characteristics, and descriptors. This class provides a number of factory methods for dealing with long UUIDs when developing your app. For example, instead of passing around the string representation of a 128-bit Bluetooth low energy attribute in your code, you can create a
CBUUID object that represents it, and pass that around instead.
The Bluetooth Special Interest Group (SIG) publishes a list of commonly-used UUIDs, many of which are 16- or 32-bits for convenience. The
CBUUID class provides methods that automatically transform these predefined shorter UUIDs into their 128-bit equivalent UUIDs. When you create a
CBUUID object from a predefined 16- or 32-bit UUID, Core Bluetooth pre-fills the rest of the 128-bit UUID with the Bluetooth base UUID, as defined in the Bluetooth 4.0 specification, Volume 3, Part F, Section 3.2.1.
In addition to providing methods for creating
CBUUID objects, this class defines constants that represent the UUIDs of the Bluetooth-defined characteristic descriptors, as defined in the Bluetooth 4.0 specification, Volume 3, Part G, Section 3.3.3.