如果在扫描时已连接，则不要扫描BLE

Question

我正在viewController.m

中扫描BLE

    - (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    discoveredPeripherals=[[NSMutableArray alloc]init];
    _CBManager=[[CBCentralManager alloc]initWithDelegate:self queue:nil];
    NSDictionary *options=@{CBCentralManagerScanOptionAllowDuplicatesKey:[NSNumber numberWithBool:NO]};
    NSArray *servicesUUIDsList=@[[CBUUID UUIDWithString:IMMEDIATE_ALERT_SERVICE_UUID],[CBUUID UUIDWithString:TX_POWER_LEVEL_SERVICE_UUID],[CBUUID UUIDWithString:BATTERY_LEVEL_SERVICE_UUID]];
    [self.CBManager scanForPeripheralsWithServices:servicesUUIDsList options:options];
}

可用的蓝牙设备将扫描，我正在通过tableView显示它们。

    -(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell;
    CBPeripheral *peripheral;
    static NSString *cellID=@"Devices";
    cell=(UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellID];
    if (!cell)
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellID];
    peripheral=[discoveredPeripherals objectAtIndex:indexPath.row];
    NSString *string1=(__bridge_transfer NSString *)CFUUIDCreateString(NULL, (__bridge CFUUIDRef)(peripheral.identifier));
    cell.textLabel.text=@"LaTag";
    [cell.textLabel setTextColor:[UIColor greenColor]];
    cell.detailTextLabel.text=string1;
    return cell;
}

如果用户选择任何人BLE，则connect方法将调用，设备将连接。通过传递我在另一个视图中连接的uuid地址。

  - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSString *tag=(__bridge_transfer NSString *)CFUUIDCreateString(NULL, (__bridge CFUUIDRef)(peripheral.identifier));
    NSLog(@"%@", tag);
        if ([tag isEqual:address])
        {
            self.currentPeripheral=peripheral;
            [self.CBManager connectPeripheral:peripheral options:Nil];
            sleep(3);
        }
}

问题是，如果我再次返回上一个视图，它将扫描并显示之前连接的标签。请帮助不要扫描已连接的标签。