What causes CBCentralManagerStateUnknown in iOS?

Question

Why do I get CBCentralManagerStateUnknown on an iPad 2 when using this simple code?

- (BOOL)viewDidLoad {

    bluetoothManager = [[CBCentralManager         


        

Answer 1

In my case I did use AppDelegate as delegate for

CBCentralManagerDelegate

and indirectional for

 AVCaptureMetadataOutputObjectsDelegate.

in one time.

1) Take care about threads. Use

dispatch_get_main_queue() 

or

[NSThread mainThread]

for work with BLE.

2) Take care about using this 2 delegates on 1 object. Because hardware is NOT thead and context save