Sets the interface channel.
- macOS 10.7+
- Core WLAN
A CWChannel object corresponding to the channel.
An NSError object passed by reference, which will be populated with the error code and the error description if an error occurs during the execution of this method. This parameter is optional and can be passed as nil.
A Boolean value which will indicate whether or not a failure occurred during execution. YES indicates no error occurred.
The channel cannot be changed if the interface is associated to a network.