iOS蓝牙开发总结

1.建立蓝牙管理中心
    @property(strong, nonatomic)    CBCentralManager        *activeCentralManager;

   _activeCentralManager = [[CBCentralManager alloc] initWithDelegate:(id<CBCentralManagerDelegate>)self queue:dispatch_get_main_queue()];

2.扫描外围设备（scan）
    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
          CBCentralManagerScanOptionAllowDuplicatesKey 的作用是：如果是同一设备会多次扫描。
    [_activeCentralManager scanForPeripheralsWithServices:nil options:options];
3.连接外设（connect）
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI 
{
    if ([_activeCentralManager isEqual:central]) {
                [self connect:peripheral];
        }

}       

- (void)connectDevice:(id)device{
    if (![peripheral services]){
        // 连接设备
        //    connectPeripheral方法连接成功后，会调用centralManager:didConnectPeripheral:
        [_activeCentralManager connectPeripheral:peripheral options:nil];
    }
    else{
        //连接失败
    }
}
4.扫描外设中的服务和特征(discover)
-(void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
    if ([_activeCentralManager isEqual:central]) {
        if (peripheral != nil){
            NSLog(@"连接成功");
            // 如果当前设备是已连接设备开始扫描服务
            NSArray *serviceArray = [self getServiceArray];
            [peripheral setDelegate:(id<CBPeripheralDelegate>)self];
            [peripheral discoverServices:serviceArray]; //执行完成此语句后 会执行discoverServices:的回调方法didDiscoverServices: 
                 //serviceArray中可以包含指定的广播 比如:18F5 
            //[peripheral discoverServices:nil]; //当穿入nil时  默认扫描所有广播
        }
    }
}
5.与外设进行数据交互（进行特征值更新）
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
｝//此方法可以获取到你想要的外设数据（存放在characteristic.value中）
if (characteristic != nil) {
                [_activePeripheral writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithoutResponse];//写入数据 
                return YES;
}
此处需注意 发送数据时writeValue: forCharacteristic: type:中的type应设置为响应模式发送 （CBCharacteristicWriteWithResponse）如果设置为非响应的模式（CBCharacteristicWriteWithoutResponse）有可能会导致蓝牙数据发送失败，无法操控蓝牙设备。