CBManagerState 里面有应该就有，没有就没办法了吧
* @constant CBManagerStateUnknown State unknown, update imminent.
* @constant CBManagerStateResetting The connection with the system service was momentarily lost, update imminent.
* @constant CBManagerStateUnsupported The platform doesn't support the Bluetooth Low Energy Central/Client role.
* @constant CBManagerStateUnauthorized The application is not authorized to use the Bluetooth Low Energy role.
* @constant CBManagerStatePoweredOff Bluetooth is currently powered off.
* @constant CBManagerStatePoweredOn Bluetooth is currently powered on and available to use.