Bluetooth turn off from control center does not really close. But I try to use "CoreBluetooth Framework" check the state. When I turn off from the control center, the state still show "CBManagerStatePoweredOff". Is it the bug? how can I distinguish between the turn off from control center and turn off from setting page. I am use "CBCentralManagerDelegate":(void) centralManagerDidUpdateState:(CBCentralManager *)central{ switch (central.state) {         case CBManagerStateUnknown:             break;         case CBManagerStateResetting:             break;         case CBManagerStateUnsupported:             break;         case CBManagerStateUnauthorized: break;         case CBManagerStatePoweredOff:             break;         case CBManagerStatePoweredOn:             break;         default:             break;     } }