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 characteristic 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.
- iOS 5.0+
- macOS 10.7+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Core Bluetooth
Though not all UUIDs that identify Bluetooth-specific attributes are predefined by the Bluetooth Special Interest Group (SIG), Bluetooth SIG has defined and published a number of commonly used UUIDs that have been shortened to 16-bits 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-bit or 32-bit UUID, Core Bluetooth pre-fills the rest of the 128-bit UUID with the Bluetooth base UUID, which is 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, which are defined in the Bluetooth 4.0 specification, Volume 3, Part G, Section 3.3.3.