#pragma mark 蓝牙设备@property (strong, nonatomic) CBCentralManager      *centralManager;         //接收@property (strong, nonatomic) CBPeripheral          *discoveredPeripheral;   //外设@end

#pragma mark 在初始化界面结束后设置自己为代理- (void)viewDidLoad {    [super viewDidLoad];       _centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];}#pragma mark 此处监控一下中央的状态值，可以判断蓝牙是否开启/可用- (void)centralManagerDidUpdateState:(CBCentralManager *)central{    NSMutableString *stringForCentralManagerState = [NSMutableString stringWithString:@"UpdateState:"];        switch (central.state) {        case CBCentralManagerStateUnknown:            [stringForCentralManagerState appendString:@"Unkown\n"];            break;        case CBCentralManagerStateUnsupported:            [stringForCentralManagerState appendString:@"Unsupported\n"];        case CBCentralManagerStateUnauthorized:            [stringForCentralManagerState appendString:@"Unauthorized\n"];        case CBCentralManagerStateResetting:            [stringForCentralManagerState appendString:@"Resetting\n"];        case CBCentralManagerStatePoweredOff:            [stringForCentralManagerState appendString:@"PowerOff\n"];        case CBCentralManagerStatePoweredOn:            //设备支持BLE并且可用            [stringForCentralManagerState appendString:@"PoweredOn\n"];                        //开始搜索            [self scan];            break;        default:            [stringForCentralManagerState appendString:@"none\n"];            break;    }    NSLog(@"%@", stringForCentralManagerState);}#pragma mark 扫描- (void)scan{        //第一个参数如果设置为nil，会寻找所有service    [self.centralManager scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]]     options:@{ CBCentralManagerScanOptionAllowDuplicatesKey : @YES }];              NSLog(@"Scanning started");}#pragma mark 发现设备,连接//一旦符合要求的设备被发现，就会回调此方法- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{        NSLog(@"Discovered %@ at %@", peripheral.name, RSSI);        if (self.discoveredPeripheral != peripheral) {                self.discoveredPeripheral = peripheral;                // 连接        NSLog(@"Connecting to peripheral %@", peripheral);        [self.centralManager connectPeripheral:peripheral options:nil];    }}#pragma mark 未能连接的处理方法- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{    NSLog(@"Failed to connect to %@. (%@)", peripheral, [error localizedDescription]);//    [self cleanup];}#pragma mark 当连接上设备- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{    NSLog(@"Peripheral Connected");        // 已连接上设备，故停止搜索    [self.centralManager stopScan];    NSLog(@"Scanning stopped");    // Make sure we get the discovery callbacks    peripheral.delegate = self;        // 寻找指定UUID的Service    [peripheral discoverServices:@[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]]];}#pragma mark 发现设备上指定Service会回调此处- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{    if (error) {        NSLog(@"Error discovering services: %@", [error localizedDescription]);        return;    }        // 寻找指定UUID的Characteristic    for (CBService *service in peripheral.services) {        [peripheral discoverCharacteristics:@[[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]] forService:service];    }}#pragma mark 找到指定UUID的Characteristic会回调此处- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{    if (error) {        NSLog(@"Error discovering characteristics: %@", [error localizedDescription]);         return;    }        for (CBCharacteristic *characteristic in service.characteristics) {        if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {            NSLog(@"find the characteristic");                                    [peripheral setNotifyValue:YES forCharacteristic:characteristic];                    }    }}- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{    if (error) {                       NSLog(@"Error discovering characteristics: %@", [error localizedDescription]);        return;    }        NSLog(@"value --> %@",characteristic.value);   #pragma mark 把接收到的数据进行截取//此处我们就可以拿到value值对其进行数据解析了    NSData *data = http://www.mamicode.com/characteristic.value;>
#pragma mark 蓝牙断开后自动重连-(void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{        NSLog(@"Peripheral Disconnected");    self.discoveredPeripheral = nil;    [self scan];        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"蓝牙连接状态" message:@"连接已断开" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:@"关闭", nil];    [alert show];   }