iOS - check if bluetooth is on without system alert popup to user

Question

This code allows to determine current bluetooth status:

CBCentralManager* testBluetooth = [[CBCentralManager alloc] initWithDelegate:nil queue: nil];


switch ([testBluetooth state]) {....}

But, when [[CBCentralManager alloc] init...] happens, system popups an alert to user, if bluetooth is off.

Is there any way to check bluetooth status without disturbing my users?

Answer 1

I got the following response from an apple developer : In iOS7, the CBCentralManagerOptionShowPowerAlertKey option lets you disable this alert.

If you havea a CBCentralManager when you initialise it, you can use the method initWithDelegate:queue:options

Example:

In my .h file i have a CBCentralManager * manager

In .m file :

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:NO], CBCentralManagerOptionShowPowerAlertKey, nil];

_manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil options:options];

[_manager scanForPeripheralsWithServices:nil options:nil];

With this code the warning no longer appears, I hope that helps !

Answer 2

In swift you can do write these two lines in your app delegate inside the func: didFinishLaunchingWithOptions launchOptions

    self.bCentralManger = CBCentralManager(delegate: self, queue: dispatch_get_main_queue(), options: [CBCentralManagerOptionShowPowerAlertKey: false])
    self.bCentralManger.scanForPeripheralsWithServices(nil, options: nil)

where your bCentralManger should be declared as :

private var bCentralManger: CBCentralManager!