苹果的蓝牙通讯使用的是CoreBluetooth.framework,实际交互是使用的CBCentralManager，搜索链接使用的代理是：CBCentralManagerDelegate，特性的读取和数据交互使用的代理是CBPeripheralDelegate。本文主要目的是为了对于蓝牙通讯进行梳理。
本文是以CBCentralMannager 中心模式 :以手机（app）作为中心，连接其他外设的场景(主要写此种该模式的应用方法)
主要要使用的是CBPeripheral、CBService、CBCharacteristic
三者的关系：
关系图.png
一个CBPeripheral有一个或者多个CBService，而每一个CBService有一个或者多个CBCharacteristic，通过可写的CBCharacteristic发送数据,而每一个CBCharacteristic有一个或者多个Description用于描述characteristic的信息或属性
下面介绍一下使用蓝牙设备连接的主要步奏
第一步引用头文件、代理和管理器
#import <CoreBluetooth/CoreBluetooth.h>
@interface BluetoochManager()<CBCentralManagerDelegate,CBPeripheralDelegate>{
CBCentralManager *CBManager;
}
初始化蓝牙设备代理
CBManager=[[CBCentralManager alloc]initWithDelegate:self queue:nil];
//代理回调
#pragma mark CBCentralManagerDelegate
//设备列表相关
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
NSString * state = nil;
switch ([central state])
{
case CBManagerStateUnsupported:
{
state = @"硬件不支持低电量蓝牙";
}
break;
case CBManagerStateUnauthorized:
{
state = @"这个应用程序未被授权使用蓝牙";
}
break;
case CBManagerStatePoweredOff:
{
state = @"蓝牙处于未开启，请开启蓝牙";
}
break;
case CBManagerStatePoweredOn:
{
state = @"work";
NSLog(@"蓝牙启动");
//切记蓝牙启动后才可以调用相关搜索设备的功能
}
break;
default :
{
state = @"未知名错误";
}
break;
}
}
搜索蓝牙设备
/**
查找蓝牙设备
*/
-(void)scanForPeripherals{
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
[[self manager] scanForPeripheralsWithServices:self.scanUUIDS options:options];
}
//代理回调
#pragma mark CBCentralManagerDelegate
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *, id> *)advertisementData RSSI:(NSNumber *)RSSI{
NSString *str = [NSString stringWithFormat:@"Did discover peripheral. peripheral: %@ rssi: %@, UUID: %@ advertisementData: %@ ", peripheral.name, RSSI, peripheral.identifier.UUIDString, advertisementData];
NSLog(@"外设:\n %@",str);
}
连接设备
// 连接某个设备
- (void)connectPeripheral:(CBPeripheral*)peripheral{
if ([peripheral state]==CBPeripheralStateDisconnected) {
[CBManager connectPeripheral:peripheral options:nil];
}else{
NSString *state = @"设备正在使用中";
}
}
//代理回调
#pragma mark CBCentralManagerDelegate 连接外设
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error{
NSLog(@"连接外设 error:\n %@",error);
}
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
NSLog(@"Did connect to peripheral: %@", peripheral);
[self stopScanning];
}
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error{
NSLog(@"Did disconnect to peripheral: %@", peripheral);
}
查找设备服务
/**
发现某个蓝牙设备的服务
@param peripheral 设备信息
*/
-(void)discoverServicesAtPeripheral:(CBPeripheral*)peripheral{
peripheral.delegate = self;
NSArray *uuids = [NSArray new];
[peripheral discoverServices:uuids];
}
//代理回调
#pragma mark CBPeripheralDelegate 设备服务
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(nullable NSError *)error{
NSArray *services = nil;
if (error) {
NSLog(@"设备的服务查找 Error %@\n", error);
}
services = [peripheral services];
if (!services || ![services count]) {
NSString *s_message=@"该设备没有服务";
}
}
查找服务的特性
/**
发现某个蓝牙设备服务的特性类别
@param peripheral 设备
@param aService 服务
@param aCallBack 特性列表
*/
-(void)discoverCharacteristicsAtPeripheral:(CBPeripheral*)peripheral ofService:(CBService*)aService{
[peripheral discoverCharacteristics:[NSArray new] forService:aService];
}
//代理回调
#pragma mark CBPeripheralDelegate 服务的特性
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(nullable NSError *)error{
NSArray *characteristics = [service characteristics];
if (error) {
NSLog(@"设备的服务的特性查找 Error %@\n", error);
}
if (!characteristics||!characteristics.count) {
NSString *c_message=@"该设备没有服务相关的特性";
}
}
读取、订阅、写入信息
/**
订阅某个蓝牙设备服务的特性变化
@param peripheral 设备
@param characteristic 特性
*/
-(void)setNotifyValueAtPeripheral:(CBPeripheral*)peripheral forCharacteristic:(CBCharacteristic*)characteristic{
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
/**
读取设备服务的特性里的数据
@param peripheral 设备
@param characteristic 特性
*/
-(void)readValueAtPeripheral:(CBPeripheral*)peripheral forCharacteristic:(CBCharacteristic *)characteristic{
[peripheral readValueForCharacteristic:characteristic];
}
/**
根据设备服务的特性写入数据
@param data 待数据
@param peripheral 设备
@param characteristic 特性
@param aType CBCharacteristicWriteType 类型
*/
-(void)writeValue:(NSData *)data atPeripheral:(CBPeripheral*)peripheral forCharacteristic:(CBCharacteristic *)characteristic type:(CBCharacteristicWriteType)aType {
[peripheral writeValue:data forCharacteristic:characteristic type:aType];
}
//代理回调
#pragma mark CBPeripheralDelegate 读写回调
//数据更新
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
if (error) {
NSLog(@"数据更新失败了 %@",error);
}
NSLog(@"收到的数据：%@",characteristic);
}
//订阅特性的状态通知
-(void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
if (error) {
NSLog(@"订阅特性状态更新出错了 %@",error);
}
NSLog(@"状态的数据：%@",characteristic);
}
//写入数据的状态消息
-(void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
if (error) {
NSLog(@"特性写入出错了 %@",error);
}
NSLog(@"写入的数据：%@",characteristic);
}
蓝牙工具的源码地址：Github
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