1.首先建立这个三个参数

@property (nonatomic,strong)CBCentralManager * manager;
@property (nonatomic,strong)CBPeripheral * peripheral; @property (nonatomic,strong)CBCharacteristic *writeDataCharacteristic

2、初始化CBCentralManager

-(CBCentralManager *)manager
{if (!_manager ){_manager  = [[CBCentralManager alloc]initWithDelegate:self queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) options:nil]; } return _manager; }

3.开始扫描蓝牙

   [self.manager scanForPeripheralsWithServices:nil options:@{CBCentralManagerRestoredStateScanOptionsKey:@(YES)}];

4.当蓝牙状态改变的时候就会调用这个方法

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{switch (central.state) {case CBCentralManagerStateUnknown://设备不支持的状态 NSLog(@">>>CBCentralManagerStateUnknown"); { dispatch_async(dispatch_get_main_queue(), ^{ ALERTVIEW(@"设备不支持"); }); } break; case CBCentralManagerStateResetting: //正在重置状态 { dispatch_async(dispatch_get_main_queue(), ^{ ALERTVIEW(@"正在重置状态"); }) ; } NSLog(@">>>CBCentralManagerStateResetting"); break; case CBCentralManagerStateUnsupported: //设备不支持的状态 { dispatch_async(dispatch_get_main_queue(), ^{ ALERTVIEW(@"设备不支持的状态"); }); } NSLog(@">>>CBCentralManagerStateUnsupported"); break; case CBCentralManagerStateUnauthorized: // 设备未授权状态 { dispatch_async(dispatch_get_main_queue(), ^{ ALERTVIEW(@"设备未授权状态"); }); } NSLog(@">>>CBCentralManagerStateUnauthorized"); break; case CBCentralManagerStatePoweredOff: //设备关闭状态 { dispatch_async(dispatch_get_main_queue(), ^{ ALERTVIEW(@"设备关闭状态"); }); } NSLog(@">>>CBCentralManagerStatePoweredOff"); break; case CBCentralManagerStatePoweredOn: NSLog(@">>>CBCentralManagerStatePoweredOn"); //开始扫描周围的外设 [self.manager scanForPeripheralsWithServices:nil options:@{CBCentralManagerRestoredStateScanOptionsKey:@(YES)}]; break; default: break; } } 

5.连接外围设备

- (void)connect:(CBPeripheral *)peripheral
{// 连接外围设备[self.manager connectPeripheral:peripheral options:nil]; }

6.连接玩设备就调用成功的方法，然后开始扫描

//连接到Peripherals-成功 //扫描外设中的服务和特征  连接上外围设备的时候会调用该方法
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral { NSLog(@">>>连接到名称为（%@）的设备-成功",peripheral.name); //设置的peripheral委托CBPeripheralDelegate //@interface ViewController : UIViewController [peripheral setDelegate:self]; //扫描外设Services，成功后会进入方法：-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{ [peripheral discoverServices:nil]; } //连接到Peripherals-失败 -(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error { NSLog(@">>>连接到名称为（%@）的设备-失败,原因:%@",[peripheral name],[error localizedDescription]); }

7.发现服务和设备的服务设备services

//发现服务
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{NSLog(@"Discovered services for %@ ", peripheral.name); if (![self.dataSourceArray containsObject:peripheral]) { [self.dataSourceArray addObject:peripheral]; NSLog(@"%@",peripheral); dispatch_async(dispatch_get_main_queue(), ^{ [_tableView reloadData]; }); } } /** * 发现外围设备的服务会来到该方法(扫描到服务之后直接添加peripheral的services) */ - (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error { NSLog(@"发现外围设备的服务"); for (CBService *serivce in peripheral.services) { NSLog(@"====%@------%@+++++++",serivce.UUID.UUIDString,self.peripheral.identifier); if ([serivce.UUID.UUIDString isEqualToString:UUIDSTR_ISSC_PROPRIETARY_SERVICE]) { // characteristicUUIDs : 可以指定想要扫描的特征(传nil,扫描所有的特征) [peripheral discoverCharacteristics:nil forService:serivce]; } } }

8.找到了设备的服务然后扫描特征

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{NSLog(@"发现外围设备的特征");for (CBCharacteristic *characteristic in service.characteristics) { NSLog(@"====%@------+",characteristic.UUID.UUIDString); if ([characteristic.UUID.UUIDString isEqualToString:UUIDSTR_ISSC_TRANS_TX]) { // 拿到特征,和外围设备进行交互 [self notifyCharacteristic:peripheral characteristic:characteristic]; } } for (CBCharacteristic *characteristic in service.characteristics) { NSLog(@"====%@------+",characteristic.UUID.UUIDString); if ([characteristic.UUID.UUIDString isEqualToString:UUIDSTR_ISSC_TRANS_RX]) { // 拿到特征,和外围设备进行交互 保存写的特征 self.writeDataCharacteristic = characteristic; } } }

9.最后一步要写上通知这个一定要写上

//设置通知
-(void)notifyCharacteristic:(CBPeripheral *)peripheralcharacteristic:(CBCharacteristic *)characteristic{//设置通知，数据通知会进入：didUpdateValueForCharacteristic方法[peripheral setNotifyValue:YES forCharacteristic:characteristic];[self.manager stopScan]; } //取消通知 -(void)cancelNotifyCharacteristic:(CBPeripheral *)peripheral characteristic:(CBCharacteristic *)characteristic{ [peripheral setNotifyValue:NO forCharacteristic:characteristic]; } 

10.大功告成只差一步就是写数据

//写数据
-(void)writeCharacteristic:(CBPeripheral *)peripheralcharacteristic:(CBCharacteristic *)characteristicvalue:(NSData *)value
{//只有 characteristic.properties 有write的权限才可以写 if(characteristic.properties & CBCharacteristicPropertyWrite){ /* 最好一个type参数可以为CBCharacteristicWriteWithResponse或type:CBCharacteristicWriteWithResponse,区别是是否会有反馈 */ [peripheral writeValue:value forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse]; }else{ NSLog(@"该字段不可写！"); } }

11.希望能帮到人，让别人少走点坑。