IOS 蓝牙 LE 扫描设备未添加到 uitableview

Question

我想用uitableview实现IOS的蓝牙扫描和连接模块。在执行时，没有任何项目被添加到列表中。你能告诉我我还需要做什么来显示带有设备名称、uuid 等的蓝牙设备列表吗？

例如，1. 如何将我的对象数组设置为 uitableview 的数据源？2.点击时如何处理设备间蓝牙连接？

 _currentperipheral = peripheral; <--also fails at Thread 1 EXC_BREAKPOINT

下面是我的控制台消息

  2014-07-11 16:34:18.286 marker[6060:60b] Scanning started
2014-07-11 17:53:14.056 marker[6115:60b] Discovered WiT Power Meter at -67

下面是我的模型类:

@interface BTDevice : NSObject {
    NSString *name;
    NSString *macAddress;
}


@property(nonatomic, retain) NSString *name;
@property(nonatomic, retain) NSString *macAddress;

- (NSString *)getName;
- (NSString *)getMacAddress;

- (void)setName:(NSString *)valueName;
- (void)setMacAddress:(NSString *)valueMacAddress;

@end

下面是我的工作:

- (void)viewDidLoad
{
    [super viewDidLoad];

    _pendingInit = YES;

    _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
    _currentperipheral=[[CBPeripheral alloc]init];
    _founddevice=FALSE;
    _foundPeripherals = [[NSMutableArray alloc] init];
    _connectedServices = [[NSMutableArray alloc] init];

}

- (void)viewWillDisappear:(BOOL)animated {

    [_centralManager stopScan];
    NSLog(@"Scanning stopped");
    [super viewWillDisappear:animated];
}


#pragma mark - Table view data source

- (void)tableView: (UITableView *)tableView
didSelectRowAtIndexPath: (NSIndexPath *)indexPath
{
    int idx=indexPath.row;
    BTSentCommandViewController * sliderVC = [self.storyboard instantiateViewControllerWithIdentifier:@"BTSentCommandViewController"];
}


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
    // Return the number of sections.
    return  [_foundPeripherals count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
    // Return the number of rows in the section.
    return [_foundPeripherals count];
}



- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
    // You should test all scenarios
    if (central.state != CBCentralManagerStatePoweredOn) {
        return;
    }

    if (central.state == CBCentralManagerStatePoweredOn) {
        // Scan for devices

        [_centralManager scanForPeripheralsWithServices:nil options:nil];
        NSLog(@"Scanning started");
    }
}


- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {

    NSLog(@"Discovered %@ at %@", peripheral.name, RSSI);

    if (_currentperipheral != peripheral) {
        // Save a local copy of the peripheral, so CoreBluetooth doesn't get rid of it
        _currentperipheral = peripheral;

        BTDevice *myDevice=[[BTDevice alloc] init];
        [myDevice setName: peripheral.name];

        NSString * macAddress =   [NSString stringWithFormat:@"%@" , peripheral.RSSI];
        [myDevice setMacAddress: macAddress] ;

        [_foundPeripherals addObject:myDevice ] ;

         [self.tableView reloadData];   
        NSLog(@"Connecting to peripheral %@", peripheral);
        [_centralManager connectPeripheral:peripheral options:nil];
    }
}

- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
    NSLog(@"Failed to connect");
    [self cleanup];
}


- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
    NSLog(@"Connected");

    [_centralManager stopScan];
    NSLog(@"Scanning stopped");

    peripheral.delegate = self;

    [peripheral discoverServices:@[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]]];
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
    if (error) {
        [self cleanup];
        return;
    }

    for (CBService *service in peripheral.services) {
        [peripheral discoverCharacteristics:@[[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]] forService:service];
    }
    // Discover other characteristics
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error {
    if (error) {
        [self cleanup];
        return;
    }

    for (CBCharacteristic *characteristic in service.characteristics) {
        if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {
            [peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
    }
}


- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
    if (error) {
        NSLog(@"Error");
        return;
    }

    NSString *stringFromData = [[NSString alloc] initWithData:characteristic.value encoding:NSUTF8StringEncoding];

    if ([stringFromData isEqualToString:@"EOM"]) {


        [peripheral setNotifyValue:NO forCharacteristic:characteristic];

        [_centralManager cancelPeripheralConnection:peripheral];
    }

    //[_data appendData:characteristic.value];
}


- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {

    if (![characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {
        return;
    }

    if (characteristic.isNotifying) {
        NSLog(@"Notification began on %@", characteristic);
    } else {
        // Notification has stopped
        [_centralManager cancelPeripheralConnection:peripheral];
    }
}

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
    _foundPeripherals = nil;

    [_centralManager scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]] options:@{ CBCentralManagerScanOptionAllowDuplicatesKey : @YES }];
}

- (void)cleanup {

    // See if we are subscribed to a characteristic on the peripheral
    if (_currentperipheral.services != nil) {
        for (CBService *service in _currentperipheral.services) {
            if (service.characteristics != nil) {
                for (CBCharacteristic *characteristic in service.characteristics) {
                    if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {
                        if (characteristic.isNotifying) {
                            [_currentperipheral setNotifyValue:NO forCharacteristic:characteristic];
                            return;
                        }
                    }
                }
            }
        }
    }

    [_centralManager cancelPeripheralConnection:_currentperipheral];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}




- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseIdentifier" forIndexPath:indexPath];

    if (cell == nil) {
        cell =  [ [UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"reuseIdentifier"] ;

        cell.selectionStyle = UITableViewCellSelectionStyleGray;
    }

    cell.textLabel.text = [_foundPeripherals objectAtIndex:indexPath.row];
    // Configure the cell...

    return cell;
}

Answer 1

这里的代码比较多，不过大体上看起来还可以。然而，有两件事确实很突出。您的 numberOfSectionsInTableView 返回 0 - 因此您的表格中将没有内容。你应该有 -

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

我建议您只将 CBPeripheral 存储在数据数组中。

另外，一旦你发现了一个外围设备并将它添加到你的数组中，你应该通知 TableView 数据源已经更新(这段代码假设你有属性 tableView 持有你的引用表格 View )-

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {

    NSLog(@"Discovered %@ at %@", peripheral.name, RSSI);

    if (![_foundPeripherals containsObject:peripheral]) {
        [_foundPeripherals addObject:myDevice ] ;

        [self.tableView reloadData];     // Tell the tableview that the data source has changed
    }

}

然后你的 cellForRowAtIndexPath 变成 -

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseIdentifier" forIndexPath:indexPath];

    if (cell == nil) {
        cell =  [ [UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"reuseIdentifier"] ;


        cell.selectionStyle = UITableViewCellSelectionStyleGray;
    }


    CBPeripheral *peripheral=[_foundPeripherals objectAtIndex:indexPath.row];

    cell.textLabel.text = peripheral.name; 
    // Configure the cell...

    return cell;
}

选中表格行时连接外设-

- (void)tableView: (UITableView *)tableView
didSelectRowAtIndexPath: (NSIndexPath *)indexPath
{

    [self performSegueWithIdentifier:@"connectSegue" sender:[_foundPeripherals objectAtIndex:indexPath.row]];  //  This is a segue to your BTSentCommandViewController
}

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{
     BTSentCommandViewController* sliderVC=( BTSentCommandViewController *)segue.destinationViewController;
     sliderVC.centralManager=_centralManager;
     sliderVC.periperhal=_sender;

}

在您的 BTSentCommandViewController 中，您可以连接到外围设备。您还应该将 BTSentCommandViewController 实例设置为外围设备委托(delegate)，并在那里实现所有 CBPeripheralDelegate 方法