iOS藍(lán)牙開(kāi)發(fā) 藍(lán)牙連接和數(shù)據(jù)讀寫(xiě)

-(CBCentralManager *)cmgr
{
  if (!_cmgr) {
    _cMgr = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
  }
  return _cMgr;
}
 
//只要中心管理者初始化 就會(huì)觸發(fā)此代理方法 判斷手機(jī)藍(lán)牙狀態(tài)
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
  switch (central.state) {
    case 0:
      NSLog(@"CBCentralManagerStateUnknown");
      break;
    case 1:
      NSLog(@"CBCentralManagerStateResetting");
      break;
    case 2:
      NSLog(@"CBCentralManagerStateUnsupported");//不支持藍(lán)牙
      break;
    case 3:
      NSLog(@"CBCentralManagerStateUnauthorized");
      break;
    case 4:
    {
      NSLog(@"CBCentralManagerStatePoweredOff");//藍(lán)牙未開(kāi)啟
    }
      break;
    case 5:
    {
      NSLog(@"CBCentralManagerStatePoweredOn");//藍(lán)牙已開(kāi)啟
       // 在中心管理者成功開(kāi)啟后再進(jìn)行一些操作
      // 搜索外設(shè)
      [self.cMgr scanForPeripheralsWithServices:nil // 通過(guò)某些服務(wù)篩選外設(shè)
                       options:nil]; // dict,條件
      // 搜索成功之后,會(huì)調(diào)用我們找到外設(shè)的代理方法
      // - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI; //找到外設(shè)
    }
      break;
    default:
      break;
  }
}

// 發(fā)現(xiàn)外設(shè)后調(diào)用的方法
- (void)centralManager:(CBCentralManager *)central // 中心管理者
 didDiscoverPeripheral:(CBPeripheral *)peripheral // 外設(shè)
   advertisementData:(NSDictionary *)advertisementData // 外設(shè)攜帶的數(shù)據(jù)
         RSSI:(NSNumber *)RSSI // 外設(shè)發(fā)出的藍(lán)牙信號(hào)強(qiáng)度
{
  //NSLog(@"%s, line = %d, cetral = %@,peripheral = %@, advertisementData = %@, RSSI = %@", __FUNCTION__, __LINE__, central, peripheral, advertisementData, RSSI);
  
  /*
   peripheral = <CBPeripheral: 0x166668f0 identifier = C69010E7-EB75-E078-FFB4-421B4B951341, Name = "OBand-75", state = disconnected>, advertisementData = {
   kCBAdvDataChannel = 38;
   kCBAdvDataIsConnectable = 1;
   kCBAdvDataLocalName = OBand;
   kCBAdvDataManufacturerData = <4c69616e 0e060678 a5043853 75>;
   kCBAdvDataServiceUUIDs =   (
   FEE7
   );
   kCBAdvDataTxPowerLevel = 0;
   }, RSSI = -55
   根據(jù)打印結(jié)果,我們可以得到運(yùn)動(dòng)手環(huán)它的名字叫 OBand-75
   
   */
  
  // 需要對(duì)連接到的外設(shè)進(jìn)行過(guò)濾
  // 1.信號(hào)強(qiáng)度(40以上才連接, 80以上連接)
  // 2.通過(guò)設(shè)備名(設(shè)備字符串前綴是 OBand)
  // 在此時(shí)我們的過(guò)濾規(guī)則是:有OBand前綴并且信號(hào)強(qiáng)度大于35
  // 通過(guò)打印,我們知道RSSI一般是帶-的
  
  if ([peripheral.name hasPrefix:@"OBand"]) {
    // 在此處對(duì)我們的 advertisementData(外設(shè)攜帶的廣播數(shù)據(jù)) 進(jìn)行一些處理
    
    // 通常通過(guò)過(guò)濾,我們會(huì)得到一些外設(shè),然后將外設(shè)儲(chǔ)存到我們的可變數(shù)組中,
    // 這里由于附近只有1個(gè)運(yùn)動(dòng)手環(huán), 所以我們先按1個(gè)外設(shè)進(jìn)行處理
    
    // 標(biāo)記我們的外設(shè),讓他的生命周期 = vc
    self.peripheral = peripheral;
    // 發(fā)現(xiàn)完之后就是進(jìn)行連接
    [self.cMgr connectPeripheral:self.peripheral options:nil];
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
  }
}

// 中心管理者連接外設(shè)成功
- (void)centralManager:(CBCentralManager *)central // 中心管理者
 didConnectPeripheral:(CBPeripheral *)peripheral // 外設(shè)
{
  NSLog(@"%s, line = %d, %@=連接成功", __FUNCTION__, __LINE__, peripheral.name);
  // 連接成功之后,可以進(jìn)行服務(wù)和特征的發(fā)現(xiàn)
  
  // 設(shè)置外設(shè)的代理
  self.peripheral.delegate = self;
  
  // 外設(shè)發(fā)現(xiàn)服務(wù),傳nil代表不過(guò)濾
  // 這里會(huì)觸發(fā)外設(shè)的代理方法 - (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
  [self.peripheral discoverServices:nil];
}
// 外設(shè)連接失敗
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
  NSLog(@"%s, line = %d, %@=連接失敗", __FUNCTION__, __LINE__, peripheral.name);
}
 
// 丟失連接
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
  NSLog(@"%s, line = %d, %@=斷開(kāi)連接", __FUNCTION__, __LINE__, peripheral.name);
}

// 發(fā)現(xiàn)外設(shè)服務(wù)里的特征的時(shí)候調(diào)用的代理方法(這個(gè)是比較重要的方法，你在這里可以通過(guò)事先知道UUID找到你需要的特征，訂閱特征，或者這里寫(xiě)入數(shù)據(jù)給特征也可以)
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
  NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
  
  for (CBCharacteristic *cha in service.characteristics) {
    //NSLog(@"%s, line = %d, char = %@", __FUNCTION__, __LINE__, cha);
    
  }
}

// 更新特征的value的時(shí)候會(huì)調(diào)用 （凡是從藍(lán)牙傳過(guò)來(lái)的數(shù)據(jù)都要經(jīng)過(guò)這個(gè)回調(diào)，簡(jiǎn)單的說(shuō)這個(gè)方法就是你拿數(shù)據(jù)的唯一方法） 你可以判斷是否
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
  NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
  if (characteristic == @"你要的特征的UUID或者是你已經(jīng)找到的特征") {
  //characteristic.value就是你要的數(shù)據(jù)
  }
}

[self.peripherale writeValue:_batteryData forCharacteristic:self.characteristic type:CBCharacteristicWriteWithResponse];
//第一個(gè)參數(shù)是已連接的藍(lán)牙設(shè)備 ；第二個(gè)參數(shù)是要寫(xiě)入到哪個(gè)特征； 第三個(gè)參數(shù)是通過(guò)此響應(yīng)記錄是否成功寫(xiě)入

// 需要注意的是特征的屬性是否支持寫(xiě)數(shù)據(jù)
- (void)yf_peripheral:(CBPeripheral *)peripheral didWriteData:(NSData *)data forCharacteristic:(nonnull CBCharacteristic *)characteristic
{
  /*
   typedef NS_OPTIONS(NSUInteger, CBCharacteristicProperties) {
   CBCharacteristicPropertyBroadcast                       = 0x01,
   CBCharacteristicPropertyRead                          = 0x02,
   CBCharacteristicPropertyWriteWithoutResponse                  = 0x04,
   CBCharacteristicPropertyWrite                         = 0x08,
   CBCharacteristicPropertyNotify                         = 0x10,
   CBCharacteristicPropertyIndicate                        = 0x20,
   CBCharacteristicPropertyAuthenticatedSignedWrites               = 0x40,
   CBCharacteristicPropertyExtendedProperties                   = 0x80,
   CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)    = 0x100,
   CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0) = 0x200
   };
   
   打印出特征的權(quán)限(characteristic.properties),可以看到有很多種,這是一個(gè)NS_OPTIONS的枚舉,可以是多個(gè)值
   常見(jiàn)的又read,write,noitfy,indicate.知道這幾個(gè)基本夠用了,前倆是讀寫(xiě)權(quán)限,后倆都是通知,倆不同的通知方式
   */
//  NSLog(@"%s, line = %d, char.pro = %d", __FUNCTION__, __LINE__, characteristic.properties);
  // 此時(shí)由于枚舉屬性是NS_OPTIONS,所以一個(gè)枚舉可能對(duì)應(yīng)多個(gè)類(lèi)型,所以判斷不能用 = ,而應(yīng)該用包含&
}