随着iOS项目开发 很多app需要通过蓝牙与设备连接
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
@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
//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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