ios - 未调用中央管理器方法。

我是iOS的新手，请给我一些建议。我的过程了解蓝牙环形扫描仪的状态。蓝牙扫描仪工作正常，我的应用从扫描仪获取数据。但是现在我的任务是，每当我打开我的应用程序时，环形扫描仪应自动连接。我也想在我的应用程序中显示蓝牙状态图标。

1)环形扫描仪已连接或在我的应用启动时已连接-蓝牙图标(蓝色)
2)未连接环形扫描仪-蓝牙图标(红色)
3)Ring Scanner由于缺乏 Activity 而失去连接或进入睡眠状态-蓝牙图标(灰色)。

我已经开始研究这个概念，但是未调用centralManager方法。这是我的代码。任何人请帮助我

 h.file

 #import <CoreBluetooth/CoreBluetooth.h>
 @property (nonatomic, strong) NSString   *connected;
 @property (nonatomic) CBCentralManager *bluetoothManager;

 m.file

 - (void)viewDidLoad
{
  [super viewDidLoad];
  _bluetoothManager = [[CBCentralManager alloc] initWithDelegate:self
                                                         queue:nil
                                                       options:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0]
                                                                                           forKey:CBCentralManagerOptionShowPowerAlertKey]];
}

 - (void)centralManagerDidUpdateState:(CBCentralManager *)central
 {

    NSString *stateString = nil;
    switch(_bluetoothManager.state)
    {
    case CBCentralManagerStateResetting: stateString = @"The connection with the system service was momentarily lost, update imminent."; break;
    case CBCentralManagerStateUnsupported: stateString = @"The platform doesn't support Bluetooth Low Energy."; break;
    case CBCentralManagerStateUnauthorized: stateString = @"The app is not authorized to use Bluetooth Low Energy."; break;
    case CBCentralManagerStatePoweredOff: stateString = @"Bluetooth is currently powered off.";
    {
        UIAlertView *BluetoothOff = [[UIAlertView alloc] initWithTitle:@"Warning!!" message:@"Turn ON Bluetooth in setting!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [BluetoothOff show];
    }
    break;
    case CBCentralManagerStatePoweredOn: stateString = @"Bluetooth is currently powered on and available to use.";
    {
  // [self.bluetoothManager scanForPeripheralsWithServices:nil options:nil];
     [self startScan];
    }
    break;
    default: stateString = @"State unknown, update imminent.";
    break;
    }
    NSLog(@"Bluetooth State: %@",stateString);
    }

    - (void)centralManager:(CBCentralManager *)central   didDiscoverPeripheral:(CBPeripheral*)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
   {
    NSLog(@"DiscoverPeripheral@");
   }

    -(void)centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *)peripherals
   {
    NSLog(@"RetrievePeripherals@");
   }

   -(void)centralManager:(CBCentralManager *)central didRetrieveConnectedPeripherals:(NSArray *)peripherals
   {
      NSLog(@"RetrieveConnectedPeripherals@");
   }

   -(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
   {
     NSLog(@"Connection Failed@");
   }

  -(void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
  {
 NSLog(@"Disconnected@");
  }

 - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
  {
   [peripheral setDelegate:self];
   [peripheral discoverServices:nil];
   self.connected = [NSString stringWithFormat:@"Connected: %@", peripheral.state == CBPeripheralStateConnected ? @"YES" : @"NO"];
  }

- (void) startScan
  {
    NSLog(@"Start scanning");
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber      numberWithBool:YES], CBCentralManagerScanOptionAllowDuplicatesKey, nil];

    [self.bluetoothManager scanForPeripheralsWithServices:nil options:options];

   }

最佳答案

您只需将外围设备的UUID保存在内部数据库中，并在应用程序启动后使用相同的UUID尝试重新连接它。

保存在

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{
  NSLog(@"peripheral.identifier=%@",peripheral.identifier.UUIDString);
}

连接外围设备后，您可以读取扫描仪提供的任何值。

关于ios - 未调用中央管理器方法。，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37208048/