Question

我是iOS新手任何人请给我一些建议。我的过程是获取有关蓝牙环扫描仪的状态。蓝牙扫描仪工作正常，我的应用程序从扫描仪获取数据。但现在我的任务是，每当我打开我的应用程序环扫描仪应该自动连接。而且我想在我的应用程序中显示蓝牙状态图标。

1）我的应用程序启动时已连接或已连接的环形扫描仪 - 蓝牙图标（蓝色） 2）未连接环形扫描仪 - 蓝牙图标（红色） 3）由于缺乏活动，环形扫描仪失去连接或睡眠 - 蓝牙图标（灰色）。

我已经开始研究这个概念但是没有调用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];

   }

Answer 1

您只需将外围设备的UUID保存在内部数据库中，并尝试在使用相同UUID启动应用程序后重新连接它。

将其保存在

中

- (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。

中央管理员方法没有被调用..

1 个答案: