一.项目简介
简单介绍一下我们的项目,我们是做一个将手机作为中心去扫描外设(蓝牙铃铛),APP通过各种指令控制蓝牙铃铛做出一些操作,框架用的是苹果提供的CoreBluetooth(基于蓝牙4.0,iOS6.0以上).其中该框架最重要的是外设peripheral和中心central,在我们这手机就是central(中心),而需要连接的铃铛就是peripheral(外设),行了,直接上代码吧!
二.代码部分(自己封装的一个蓝牙管理类,重要的代码)
因为,蓝牙可能不止一个界面用到,所以我在此将它写成了一个单例.
// 蓝牙主要就是读写操作,需要蓝牙那边告知不同的UUID
#import "ACHLBluetooth.h"
#import <CoreBluetooth/CoreBluetooth.h>
#define ST_CAHRACTERISTIC @"xxxx"//读取数据ID
#define WT_CAHRACTERISTIC @"xxxx"//写入数据ID
#define GET_VERSION @"xxxx" // 获取版本号
#define SERVICE_UUID @"0000xxxx-0000-1000-8000-00805f9b34fb"
@interface ACHLBluetooth () <CBCentralManagerDelegate,CBPeripheralDelegate>
@property (nonatomic, strong) CBCentralManager *centralMgr;
@property (nonatomic, strong) CBCharacteristic *writeCharacteristic;
@end
static ACHLBluetooth *blueManager = nil;
初始化,设置代理
blueManager.centralMgr = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
判断是否开启蓝牙
#pragma mark ------ CBCentralManager代理方法 -------
// 检查蓝牙是否可用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
NSLog(@"检查蓝牙是否可用");
switch (central.state) {
case CBCentralManagerStatePoweredOn:
// 扫描所有的外设
[self scanDevice];
break;
case CBCentralManagerStatePoweredOff:
NSLog(@"蓝牙关闭了");
break;
default:
break;
}
}
// 扫描蓝牙
- (void)scanDevice {
[blueManager.centralMgr scanForPeripheralsWithServices:nil options:nil];
}
扫描到的外设(centralManager的代理方法)
// 扫描外设连接
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI {
NSLog(@"扫描到%@的外设---%@",peripheral,advertisementData);
// 用1或2方法
// 1.通过通知(代理,block等)传到外面在外面连接
// [[NSNotificationCenter defaultCenter] postNotificationName:@"scanedDevice" object:nil userInfo:@{@"central":central,@"advertisementData":advertisementData,@"peripheral":peripheral}];
//2.找到需要的蓝牙设备，停止搜素，保存数据(本页面连接)
// if([[peripheral.identifier UUIDString] isEqualToString:IDENTIFIER]){
// NSLog(@"扫描到名字为%@的蓝牙并开始连接",peripheral.name);
//
// blueManager.discoveredPeripheral = peripheral;
// 连接蓝牙
// [blueManager.centralMgr connectPeripheral:peripheral options:nil];
//
// }else{
//
// NSLog(@"未扫描到蓝牙");
// }
}
连接断开,成功,失败
//连接成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
NSLog(@"蓝牙连接成功");
// 停止扫描
[blueManager.centralMgr stopScan];
if (self.delegate && [self.delegate respondsToSelector:@selector(connectSuccess)]) {
[self.delegate connectSuccess];
}
// 设置服务代理
[blueManager.discoveredPeripheral setDelegate:self];
[blueManager.discoveredPeripheral discoverServices:nil];
}
// 连接失败
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
NSLog(@"蓝牙连接失败");
// 通过代理传出去提示用户
if (self.delegate && [self.delegate respondsToSelector:@selector(connectError:)]) {
[self.delegate connectError:error];
}
}
// 断开连接了
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
NSLog(@"连接断开");
// 记得提示用户
blueManager.discoveredPeripheral = nil;
}
------- CBPeripheral代理方法 ---------
//获取服务后的回调
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
if (error)
{
NSLog(@"didDiscoverServices : %@", [error localizedDescription]);
return;
}
for (CBService *s in peripheral.services)
{
[s.peripheral discoverCharacteristics:nil forService:s];
}
}
//获取特征后的回调
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
if (error)
{
NSLog(@"获取服务特征出错: %@", [error localizedDescription]);
return;
}
for (CBCharacteristic *c in service.characteristics)
{
// NSLog(@"-=-=-=--=-=-=%@",c.UUID.UUIDString);
if ([c.UUID.UUIDString isEqualToString:ST_CAHRACTERISTIC]) {
// 这里记得开启通知
[peripheral setNotifyValue:YES forCharacteristic:c];
}
else if ([c.UUID.UUIDString isEqualToString:WT_CAHRACTERISTIC])
{
blueManager.writeCharacteristic = c;
}else if ([c.UUID.UUIDString isEqualToString:GET_VERSION]) {
// 开启通知
[peripheral setNotifyValue:YES forCharacteristic:c];
}
}
}
//订阅的特征值有新的数据时回调
- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic
error:(NSError *)error {
if (error) {
NSLog(@"Error changing notification state: %@",
[error localizedDescription]);
}
[peripheral readValueForCharacteristic:characteristic];
}
// 特征值更新时回调
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
NSLog(@"获取新的特征值了");
if (error) {
NSLog(@"获取新特征值时出错");
return;
}
if ([characteristic.UUID.UUIDString isEqualToString:GET_VERSION]) {
NSString *string = [[NSString alloc]initWithData:characteristic.value encoding:NSUTF8StringEncoding];
NSLog(@"版本号:%@",string);
}
if ([characteristic.UUID.UUIDString isEqualToString:ST_CAHRACTERISTIC]) {
NSLog(@"外设返回的数据为%@",characteristic.value);
//转为字符串
NSMutableString *strTemp = [NSMutableString stringWithCapacity:[characteristic.value length]*2];
const unsigned char *szBuffer = [characteristic.value bytes];
for (NSInteger i=0; i < [characteristic.value length]; ++i) {
[strTemp appendFormat:@"%02lx",(unsigned long)szBuffer[i]];
// 根据自己需求处理strTemp....
}
// 写入数据时回调
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
if (error) {
NSLog(@"写入数据出错");
return;
} else {
NSLog(@"恭喜你写入数据成功!");
}
}
用户主动断开连接
// 断开连接
- (void)disconnect {
[blueManager.centralMgr cancelPeripheralConnection:blueManager.discoveredPeripheral];
blueManager.discoveredPeripheral = nil;
}
写入数据
// 写入数据
- (void)writeWithString:(NSString *)string {
// -----这个得看蓝牙那边,我在这写的只是我们这边的,并不适用所有.
int length =(int)string.length / 2 ;
SignedByte bytes[length];
for (int i=0; i<length;i++) {
int j=i*2;
NSString *tmp=[string substringWithRange:NSMakeRange(j, 2)];
unsigned int anInt;
NSScanner * scanner = [[NSScanner alloc] initWithString:tmp];
[scanner scanHexInt:&anInt];
bytes[i] = anInt;
}
//-----
NSData *writeData = [NSData dataWithBytes:bytes length:length];
if (blueManager.writeCharacteristic.properties & CBCharacteristicPropertyWrite) {
[blueManager.discoveredPeripheral writeValue:writeData forCharacteristic:blueManager.writeCharacteristic type:CBCharacteristicWriteWithResponse];
} else {
NSLog(@"不可写");
}
}
（PS：这是个简单的蓝牙读写数据的demo，项目中有个完善的多外设连接的，如有需要可联系）
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