随着iOS项目开发 很多app需要通过蓝牙与设备连接
蓝牙开发注意：
先定义中心设备和外围设备以及遵守蓝牙协议
@interface ViewController()<CBCentralManagerDelegate,CBPeripheralDelegate>@property (strong, nonatomic) CBCentralManager *manager;@property (nonatomic, strong) CBPeripheral *peripheral;@property (nonatomic, weak)NSTimer * connentTimer;@end
再实现delegate方法
判断蓝牙状态，如成功则扫描指定UUID设备（如不指定UUID，则无法后台持续连接）当发现指定设备后，连接该设备当连接指定外围设备成功，编写定时器，每秒读取1次RSSI当监听到失去和外围设备连接，重新建立连接当读取到RSSI值，打印出它的值//蓝牙状态- (void)centralManagerDidUpdateState:(CBCentralManager *)central{NSString * state = nil;switch ([central state]){case CBCentralManagerStateUnsupported:state = @"The platform/hardware doesn't support Bluetooth Low Energy.";break;//应用程序没有被授权使用蓝牙case CBCentralManagerStateUnauthorized:state = @"The app is not authorized to use Bluetooth Low Energy.";break;//尚未打开蓝牙case CBCentralManagerStatePoweredOff:state = @"Bluetooth is currently powered off.";break;//连接成功case CBCentralManagerStatePoweredOn:[self.manager scanForPeripheralsWithServices:nil options:nil];state = @"work";break;case CBCentralManagerStateUnknown:default:;}NSLog(@"Central manager state: %@", state);}//查找设备- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{//每个蓝牙设备有自己唯一的标识符，根据标识符确认自己要连接的设备if ([peripheral.identifier isEqual:self.peripheral.identifier]){self.peripheral = peripheral;//数据连接定时器self.connentTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(connentPeripheral) userInfo:@"timer" repeats:YES];[self.connentTimer fire];}}- (void)connentPeripheral {//连接外设self.manager.delegate = self;[self.manager connectPeripheral:_peripheral options:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:CBConnectPeripheralOptionNotifyOnDisconnectionKey]];}//连接成功后调用- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{NSLog(@"Did connect to peripheral: %@,%@", peripheral,peripheral.name);[peripheral setDelegate:self]; //查找服务[peripheral discoverServices:nil];[self.connentTimer invalidate];//监测设备是否断开了// [self createWorkDataSourceWithTimeInterval:1];}//当监听到失去和外围设备连接，重新建立连接//这个方法是必须实现的，因为蓝牙会中断连接，正好触发这个方法重建连接。重建连接可能造成数秒后才能读取到RSSI。- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{[self.manager connectPeripheral:peripheral options:nil];}- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{NSLog(@"%@",error.description);}//返回的蓝牙服务通知通过代理实现- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{if (error){NSLog(@"Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]);return;}for (CBService *service in peripheral.services){// NSLog(@"Service found with UUID: %@", service.UUID.UUIDString);//发现服务if ([service.UUID isEqual:[CBUUID UUIDWithString:@"180D"]])//heart rate{//在一个服务中寻找特征值[peripheral discoverCharacteristics:nil forService:service];}}}//返回的蓝牙特征值通知通过代理实现- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{if (error){NSLog(@"Discovered characteristics for %@ with error: %@", service.UUID, [error localizedDescription]);return;}for (CBCharacteristic * characteristic in service.characteristics){NSLog(@"characteristic:%@",characteristic);if( [characteristic.UUID isEqual:[CBUUID UUIDWithString:@"2A37"]]){[self notification:service.UUID characteristicUUID:characteristic.UUID peripheral:peripheral on:YES];// [self.peripheral setNotifyValue:YES forCharacteristic:characteristic];}}}//处理蓝牙发过来的数据- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{}-(void) notification:(CBUUID *) serviceUUID characteristicUUID:(CBUUID *)characteristicUUID peripheral:(CBPeripheral *)p on:(BOOL)on{CBService *service = [self getServiceFromUUID:serviceUUID p:p];if (!service){// if (p.UUID == NULL) return; // zach ios6 addedche// NSLog(@"Could not find service with UUID on peripheral with UUID \n");return;}CBCharacteristic *characteristic = [self getCharacteristicFromUUID:characteristicUUID service:service];if (!characteristic){// if (p.UUID == NULL) return; // zach ios6 added// NSLog(@"Could not find characteristic with UUID on service with UUID on peripheral with UUID\n");return;}[p setNotifyValue:on forCharacteristic:characteristic];}-(CBService *) getServiceFromUUID:(CBUUID *)UUID p:(CBPeripheral *)p{for (CBService* s in p.services){if ([s.UUID isEqual:UUID]) return s;}return nil; //Service not found on this peripheral}-(CBCharacteristic *) getCharacteristicFromUUID:(CBUUID *)UUID service:(CBService*)service {for (CBCharacteristic* c in service.characteristics){if ([c.UUID isEqual:UUID]) return c;}return nil; //Characteristic not found on this service}
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