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
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@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
1.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）
2.当发现指定设备后，连接该设备
3.当连接指定外围设备成功，编写定时器，每秒读取1次RSSI
4.当监听到失去和外围设备连接，重新建立连接
5.当读取到RSSI值，打印出它的值
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//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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原文链接：https://blog.csdn.net/cbl643966855/article/details/50738313
