所做的东西是通过手机/pad与蓝牙4.0的设备进行连接，之后设备上按对应的按键我们会收到对应的数值。首先需要和做蓝牙4.0的同事沟通好通信协议，具体的数据解析部分就不过多赘述了，主要写一下蓝牙接收数据的部分
1.和做蓝牙的同事沟通好设备的UUID以及特点，可以把他们写成宏
#define TRANSFER_SERVICE_UUID @"0000fff0-0000-1000-8000-00805f9b34fb"
#define TRANSFER_CHARACTERISTIC_UUID @"0000fff7-0000-1000-8000-00805f9b34fb"
2.在.H文件中导入两个头文件，并在接口中实现两个协议
#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>
#import "UUID.h"
//需要实现协议
@interface ViewController () < CBCentralManagerDelegate, CBPeripheralDelegate>
{
}
3.创建两个蓝牙设备属性，一个相当于主机，一个相当于外设从机
#pragma mark 蓝牙设备
@property (strong, nonatomic) CBCentralManager *centralManager; //接收
@property (strong, nonatomic) CBPeripheral *discoveredPeripheral; //外设
@end
4.开始蓝牙配置
#pragma mark 在初始化界面结束后设置自己为代理
- (void)viewDidLoad {
[super viewDidLoad];
_centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}
#pragma mark 此处监控一下中央的状态值，可以判断蓝牙是否开启/可用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
NSMutableString *stringForCentralManagerState = [NSMutableString stringWithString:@"UpdateState:"];
switch (central.state) {
case CBCentralManagerStateUnknown:
[stringForCentralManagerState appendString:@"Unkown\n"];
break;
case CBCentralManagerStateUnsupported:
[stringForCentralManagerState appendString:@"Unsupported\n"];
case CBCentralManagerStateUnauthorized:
[stringForCentralManagerState appendString:@"Unauthorized\n"];
case CBCentralManagerStateResetting:
[stringForCentralManagerState appendString:@"Resetting\n"];
case CBCentralManagerStatePoweredOff:
[stringForCentralManagerState appendString:@"PowerOff\n"];
case CBCentralManagerStatePoweredOn:
//设备支持BLE并且可用
[stringForCentralManagerState appendString:@"PoweredOn\n"];
//开始搜索
[self scan];
break;
default:
[stringForCentralManagerState appendString:@"none\n"];
break;
}
NSLog(@"%@", stringForCentralManagerState);
}
#pragma mark 扫描
- (void)scan
{
//第一个参数如果设置为nil，会寻找所有service
[self.centralManager scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]]
options:@{ CBCentralManagerScanOptionAllowDuplicatesKey : @YES }];
NSLog(@"Scanning started");
}
#pragma mark 发现设备,连接
//一旦符合要求的设备被发现，就会回调此方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSLog(@"Discovered %@ at %@", peripheral.name, RSSI);
if (self.discoveredPeripheral != peripheral) {
self.discoveredPeripheral = peripheral;
// 连接
NSLog(@"Connecting to peripheral %@", peripheral);
[self.centralManager connectPeripheral:peripheral options:nil];
}
}
#pragma mark 未能连接的处理方法
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(@"Failed to connect to %@. (%@)", peripheral, [error localizedDescription]);
// [self cleanup];
}
#pragma mark 当连接上设备
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
NSLog(@"Peripheral Connected");
// 已连接上设备，故停止搜索
[self.centralManager stopScan];
NSLog(@"Scanning stopped");
// Make sure we get the discovery callbacks
peripheral.delegate = self;
// 寻找指定UUID的Service
[peripheral discoverServices:@[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]]];
}
#pragma mark 发现设备上指定Service会回调此处
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
if (error) {
NSLog(@"Error discovering services: %@", [error localizedDescription]);
return;
}
// 寻找指定UUID的Characteristic
for (CBService *service in peripheral.services) {
[peripheral discoverCharacteristics:@[[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]] forService:service];
}
}
#pragma mark 找到指定UUID的Characteristic会回调此处
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
if (error) {
NSLog(@"Error discovering characteristics: %@", [error localizedDescription]);
return;
}
for (CBCharacteristic *characteristic in service.characteristics) {
if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:TRANSFER_CHARACTERISTIC_UUID]]) {
NSLog(@"find the characteristic");
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
}
}
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
if (error) {
NSLog(@"Error discovering characteristics: %@", [error localizedDescription]);
return;
}
NSLog(@"value --> %@",characteristic.value);
#pragma mark 把接收到的数据进行截取
//此处我们就可以拿到value值对其进行数据解析了
NSData *data = characteristic.value;
}
#pragma mark 蓝牙断开后自动重连
-(void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
NSLog(@"Peripheral Disconnected");
self.discoveredPeripheral = nil;
[self scan];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"蓝牙连接状态" message:@"连接已断开" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:@"关闭", nil];
[alert show];
}
5.蓝牙后台运行
若要实现蓝牙4.0在APP进入后台时仍能工作，传输数据，不用写代码，只需要修改xxx-info.plist文件即可
在所需的背景模式中加入两项
使用CoreBluetooth应用程序共享数据 和 应用程序进行通信使用CoreBluetooth即可
