在 iOS 应用开发中，蓝牙开发是一个重点， 是 iOS 开发人员必须掌握的一个知识。今天小编就将为大家分享一篇 iOS 大牛写的有关蓝牙开发中，使用 app 发布一个 peripheral，给其他的 central 连接的实现方法。
peripheral 模式的流程
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打开 peripheralManager，设置 peripheralManager 的委托
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创建 characteristics，characteristics 的 description 创建 service，把 characteristics 添加到 service 中，再把 service 添加到 peripheralManager 中
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开启广播 advertising
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对 central 的操作进行响应
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4.1 读 characteristics 请求
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4.2 写 characteristics 请求
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4.4 订阅和取消订阅 characteristics
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准备开发环境
1 、Xcode
2、 开发证书和手机（蓝牙程序需要使用使用真机调试，使用模拟器也可以调试，但是方法很负责，本篇分享不做过多赘述），如果不行可以使用 osx 程序调试
3、 蓝牙外设
实现步骤
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打开 peripheralManager，设置 peripheralManager 的委托。设置当前 ViewController 实现 CBPeripheralManagerDelegate 委托
@interface BePeripheralViewController : UIViewController
初始化 peripheralManager
/* 和CBCentralManager类似，蓝牙设备打开需要一定时间，打开成功后会进入委托方法 - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral; 模拟器永远也不会得CBPeripheralManagerStatePoweredOn状态 */ peripheralManager = [[CBPeripheralManager alloc]initWithDelegate:self queue:nil];
- 创建 characteristics，characteristics 的 description ，创建 service，把 characteristics 添加到 service 中，再把 service 添加到 peripheralManager 中
在委托方法 - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral 中，当 peripheral 成功打开后，才可以配置 service 和 characteristics。 这里创建的 service 和 chara 对象是 CBMutableCharacteristic 和 CBMutableService。他们的区别就像 NSArray 和 NSMutableArray 区别类似。 我们先创建 characteristics 和 description，description 是 characteristics 的描述，描述分很多种， 这里不细说了，常用的就是 CBUUIDCharacteristicUserDescriptionString。
//peripheralManager 状态改变
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(void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral{
switch (peripheral.state) {
//在这里判断蓝牙设别的状态 当开启了则可调用 setUp方法(自定义) case CBPeripheralManagerStatePoweredOn: NSLog(@"powered on"); [info setText:[NSString stringWithFormat:@"设备名%@已经打开，可以使用center进行连接",LocalNameKey]]; [self setUp]; break; case CBPeripheralManagerStatePoweredOff: NSLog(@"powered off"); [info setText:@"powered off"]; break; default: break;}
}
//配置 bluetooch 的
-(void)setUp{
//characteristics 字段描述
CBUUID *CBUUIDCharacteristicUserDescriptionStringUUID = [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString]; /* 可以通知的Characteristic properties：CBCharacteristicPropertyNotify permissions CBAttributePermissionsReadable */ CBMutableCharacteristic *notiyCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:notiyCharacteristicUUID] properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsReadable]; /* 可读写的characteristics properties：CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead permissions CBAttributePermissionsReadable | CBAttributePermissionsWriteable */ CBMutableCharacteristic *readwriteCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:readwriteCharacteristicUUID] properties:CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable | CBAttributePermissionsWriteable]; //设置description CBMutableDescriptor *readwriteCharacteristicDescription1 = [[CBMutableDescriptor alloc]initWithType: CBUUIDCharacteristicUserDescriptionStringUUID value:@"name"]; [readwriteCharacteristic setDescriptors:@[readwriteCharacteristicDescription1]]; /* 只读的Characteristic properties：CBCharacteristicPropertyRead permissions CBAttributePermissionsReadable */ CBMutableCharacteristic *readCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:readCharacteristicUUID] properties:CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable]; //service1初始化并加入两个characteristics CBMutableService *service1 = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:ServiceUUID1] primary:YES]; [service1 setCharacteristics:@[notiyCharacteristic,readwriteCharacteristic]]; //service2初始化并加入一个characteristics CBMutableService *service2 = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:ServiceUUID2] primary:YES]; [service2 setCharacteristics:@[readCharacteristic]]; //添加后就会调用代理的- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error [peripheralManager addService:service1]; [peripheralManager addService:service2];
}
- 开启广播 advertising
//perihpheral 添加了 service
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(void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error{
if (error == nil) {
serviceNum++;}
//因为我们添加了 2 个服务，所以想两次都添加完成后才去发送广播
if (serviceNum==2) {
//添加服务后可以在此向外界发出通告 调用完这个方法后会调用代理的 //(void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error [peripheralManager startAdvertising:@{ CBAdvertisementDataServiceUUIDsKey : @[[CBUUID UUIDWithString:ServiceUUID1],[CBUUID UUIDWithString:ServiceUUID2]], CBAdvertisementDataLocalNameKey : LocalNameKey } ];}
}
//peripheral 开始发送 advertising
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(void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error{
NSLog(@"in peripheralManagerDidStartAdvertisiong");
}
- 对 central 的操作进行响应
-
4.1 读 characteristics 请求
-
4.2 写 characteristics 请求
-
4.3 订阅和取消订阅 characteristics
//订阅 characteristics
-(void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic{
NSLog(@"订阅了 %@的数据",characteristic.UUID); //每秒执行一次给主设备发送一个当前时间的秒数 timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(sendData:) userInfo:characteristic repeats:YES];
}
//取消订阅 characteristics
-(void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic{
NSLog(@"取消订阅 %@的数据",characteristic.UUID); //取消回应 [timer invalidate];
}
//发送数据，发送当前时间的秒数
-(BOOL)sendData:(NSTimer *)t {
CBMutableCharacteristic *characteristic = t.userInfo; NSDateFormatter *dft = [[NSDateFormatter alloc]init]; [dft setDateFormat:@"ss"]; NSLog(@"%@",[dft stringFromDate:[NSDate date]]); //执行回应Central通知数据 return [peripheralManager updateValue:[[dft stringFromDate:[NSDate date]] dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:(CBMutableCharacteristic *)characteristic onSubscribedCentrals:nil];
}
//读 characteristics 请求
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(void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request{
NSLog(@"didReceiveReadRequest");
//判断是否有读数据的权限
if (request.characteristic.properties & CBCharacteristicPropertyRead) {
NSData *data = request.characteristic.value; [request setValue:data]; //对请求作出成功响应 [peripheralManager respondToRequest:request withResult:CBATTErrorSuccess];}else{
[peripheralManager respondToRequest:request withResult:CBATTErrorWriteNotPermitted];}
}
//写 characteristics 请求
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(void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray *)requests{
NSLog(@"didReceiveWriteRequests");
CBATTRequest *request = requests[0];
//判断是否有写数据的权限
if (request.characteristic.properties & CBCharacteristicPropertyWrite) {
//需要转换成CBMutableCharacteristic对象才能进行写值 CBMutableCharacteristic *c =(CBMutableCharacteristic *)request.characteristic; c.value = request.value; [peripheralManager respondToRequest:request withResult:CBATTErrorSuccess];}else{
[peripheralManager respondToRequest:request withResult:CBATTErrorWriteNotPermitted];}
}
以上就是 iOS 蓝牙开发中，app 作为外设被连接的具体实现方法，希望对大家开发这项功能有所帮助吧。
相关文章：《DASH 中查询 iOS 文档的方法》 http://www.maiziedu.com/group/article/5618/
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