Bluetooth on/off test

BL on or off

#import "ViewController.h"
@import CoreBluetooth;

@interface ViewController () <CBCentralManagerDelegate>

@property(nonatomic, strong) CBCentralManager *cbManager;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // disable or enabled default system alert
    NSDictionary *options = [NSDictionary dictionaryWithObject:@(NO) forKey:CBCentralManagerOptionShowPowerAlertKey];
    
    self.cbManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil options:options];
    
    // see docu of this method
   // [self.cbManager scanForPeripheralsWithServices:nil options:nil];
}

- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
    if ([central state] == CBCentralManagerStatePoweredOn) {
        
        NSLog(@"BL is enabled");
    }
    else {
        NSLog(@"BL is disabled");
    }
}

// http://stackoverflow.com/a/21696963/470964
- (void)checkBluetoothAccess {
    
    if(!self.cbManager) {
        self.cbManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
    }
    
    /*
     We can ask the bluetooth manager ahead of time what the authorization status is for our bundle and take the appropriate action.
     */
    
    CBCentralManagerState state = [self.cbManager state];
    
    
    if(state == CBCentralManagerStateUnknown) {
        NSLog(@"state UNKNOWN");
    }
    else if(state == CBCentralManagerStateUnauthorized) {
        NSLog(@"state DENIED");
    }
    else {
        NSLog(@"state GRANTED");
    }
}

@end