iOS关于蓝牙连接的简单介绍与使用

下面是两台iPhone6连接同一台蓝牙设备的结果：

**成功连接**** peripheral: <CBPeripheral: 0x1700f4500, identifier = 50084F69-BA5A-34AC-8A6E-6F0CEADB21CD, name = 555555555588,
state = connected> with UUID: <__NSConcreteUUID 0x17003d980> 50084F69-BA5A-34AC-8A6E-6F0CEADB21CD**
****
****
**成功连接**** peripheral: <CBPeripheral: 0x1742e3000, identifier = 55B7D759-0F1E-6271-EA14-BC5A9C9EEEEC, name = 555555555588,
state = connected> with UUID: <__NSConcreteUUID 0x174036c00> 55B7D759-0F1E-6271-EA14-BC5A9C9EEEEC**

iOS的蓝牙开发很简单，只要包含一个库，创建CBCentralManager实例，实现代理方法，然后就可以直接和设备进行通信。

发现附近的特定蓝牙设备

#import <CoreBluetooth/CoreBluetooth.h>

首先可以定义一些即将使用到的UUID的宏


#define kPeripheralName     @"360qws Electric Bike Service" //外围设备名称
#define kServiceUUID        @"7CACEB8B-DFC4-4A40-A942-AAD653D174DC" //服务的UUID

#define kCharacteristicUUID @"282A67B2-8DAB-4577-A42F-C4871A3EEC4F" //特征的UUID
如果不是把手机作为中心设备的话，这些没有必要设置。

1.设备的UUID以及characteristic，可以把他们写成宏

#define TRANSFER_SERVICE_UUID           @"0000fff0-0000-1000-8000-00206f9c56cad"

#define TRANSFER_CHARACTERISTIC_UUID    @"0000fff7-0000-1000-8000-00806f9c56cad"

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>

//需要实现协议

@interfaceViewController () <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

@implementation ViewController

- (void)viewDidLoad {

[superviewDidLoad];

_centralManager = [[CBCentralManageralloc]initWithDelegate:selfqueue:nil];

}

#pragma mark  此处监控一下central的状态值，可以判断蓝牙是否开启/可用

- (void)centralManagerDidUpdateState:(CBCentralManager *)central

{

NSMutableString *stringForCentralManagerState = [NSMutableStringstringWithString:@"UpdateState:"];

switch (central.state) {

caseCBCentralManagerStateUnknown:

[stringForCentralManagerStateappendString:@"Unkown\n"];

break;

caseCBCentralManagerStateUnsupported:

[stringForCentralManagerStateappendString:@"Unsupported\n"];

caseCBCentralManagerStateUnauthorized:

[stringForCentralManagerStateappendString:@"Unauthorized\n"];

caseCBCentralManagerStateResetting:

[stringForCentralManagerStateappendString:@"Resetting\n"];

caseCBCentralManagerStatePoweredOff:

[stringForCentralManagerStateappendString:@"PowerOff\n"];

caseCBCentralManagerStatePoweredOn:

//设备支持BLE并且可用

[stringForCentralManagerStateappendString:@"PoweredOn\n"];

//开始搜索

[selfscan];

break;

default:

[stringForCentralManagerStateappendString:@"none\n"];

break;

}

NSLog(@"%@", stringForCentralManagerState);

}

#pragma mark
扫描

- (void)scan

{           [self.centralManage scanForPeripheralsWithServices:@[[CBUUI 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

[self.centralManagerconnectPeripheral:peripheraloptions:nil];

NSLog(@"Connecting to peripheral
%@", peripheral);

}

}

#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, [errorlocalizedDescription]);

}

#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.centralManagerstopScan];

NSLog(@"Scanning stopped");

peripheral.delegate =self;

//寻找指定UUID的Service

[peripheraldiscoverServices:@[[CBUUIDUUIDWithString: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: %@", [errorlocalizedDescription]);

return;

}

//寻找指定UUID的Characteristic

for (CBService *servicein peripheral.services) {

[peripheraldiscoverCharacteristics:@[[CBUUIDUUIDWithString: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: %@", [errorlocalizedDescription]);

return;

}

for (CBCharacteristic *characteristicin service.characteristics) {

if ([characteristic.UUIDisEqual:[CBUUIDUUIDWithString:TRANSFER_CHARACTERISTIC_UUID]])
{

NSLog(@"find the characteristic");

[peripheralsetNotifyValue:YESforCharacteristic:characteristic];

}

}

}

- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic
*)characteristic error:(NSError *)error

{

if (error) {

NSLog(@"Error discovering characteristics: %@", [errorlocalizedDescription]);

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;

// 重新开启搜索

[selfscan];

UIAlertView *alert = [[UIAlertViewalloc]initWithTitle:@"蓝牙连接状态"message:@"连接已断开"delegate:nilcancelButtonTitle:@"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Required background modes中加入两项

App shares data using CoreBluetooth  和  App communicates using CoreBluetooth
即可