首先需要导入基本依赖库，CoreBluetooth.framework,MultipeerConnectivity.framework,GameKit.framework
#import "ViewController.h"
#import <CoreBluetooth/CoreBluetooth.h>
#define kServiceUUID @"C4FB2349-72FE-4CA2-94D6-1F3CB16331EE" //服务的UUID
#define kCharacteristicUUID @"6A3E4B28-522D-4B3B-82A9-D5E2004534FC" //特征的UUID
@interface ViewController ()<CBCentralManagerDelegate,CBPeripheralManagerDelegate>
@property (strong,nonatomic) CBCentralManager *centralManager;//中心设备管理器
@property (strong,nonatomic) NSMutableArray *peripherals;//连接的外围设备
@property (weak, nonatomic) IBOutlet UITextView *log; //日志记录
- (IBAction)Left:(UIBarButtonItem *)sender;
- (IBAction)Right:(UIBarButtonItem *)sender;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
}
#pragma mark ****************UI事件***********************
- (IBAction)Left:(UIBarButtonItem *)sender
{
//创建中心设备管理器并设置当前控制器视图为代理
_centralManager=[[CBCentralManager alloc]initWithDelegate:self queue:nil];
}
- (IBAction)Right:(UIBarButtonItem *)sender
{
}
#pragma mark - CBCentralManager代理方法
//中心服务器状态更新后
-(void)centralManagerDidUpdateState:(CBCentralManager *)central{
switch (central.state) {
case CBPeripheralManagerStatePoweredOn:
NSLog(@"BLE已打开.");
[self writeToLog:@"BLE已打开."];
//扫描外围设备
// [central scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:kServiceUUID]] options:@{CBCentralManagerScanOptionAllowDuplicatesKey:@YES}];
[central scanForPeripheralsWithServices:nil options:@{CBCentralManagerScanOptionAllowDuplicatesKey:@YES}];
break;
default:
NSLog(@"此设备不支持BLE或未打开蓝牙功能，无法作为外围设备.");
[self writeToLog:@"此设备不支持BLE或未打开蓝牙功能，无法作为外围设备."];
break;
}
}
/**
* 发现外围设备
*
* @param central 中心设备
* @param peripheral 外围设备
* @param advertisementData 特征数据
* @param RSSI 信号质量（信号强度）
*/
-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{
NSLog(@"发现外围设备...");
[self writeToLog:@"发现外围设备..."];
//停止扫描
[self.centralManager stopScan];
//连接外围设备
if (peripheral) {
//添加保存外围设备，注意如果这里不保存外围设备（或者说peripheral没有一个强引用，无法到达连接成功（或失败）的代理方法，因为在此方法调用完就会被销毁
if(![self.peripherals containsObject:peripheral]){
[self.peripherals addObject:peripheral];
}
NSLog(@"开始连接外围设备...");
[self writeToLog:@"开始连接外围设备..."];
[self.centralManager connectPeripheral:peripheral options:nil];
}
}
//连接到外围设备
-(void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
NSLog(@"连接外围设备成功!");
[self writeToLog:@"连接外围设备成功!"];
//设置外围设备的代理为当前视图控制器
peripheral.delegate=self;
//外围设备开始寻找服务
[peripheral discoverServices:@[[CBUUID UUIDWithString:kServiceUUID]]];
}
//连接外围设备失败
-(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{
NSLog(@"连接外围设备失败!");
[self writeToLog:@"连接外围设备失败!"];
}
#pragma mark - CBPeripheral 代理方法
//外围设备寻找到服务后
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
NSLog(@"已发现可用服务...");
[self writeToLog:@"已发现可用服务..."];
if(error){
NSLog(@"外围设备寻找服务过程中发生错误，错误信息：%@",error.localizedDescription);
[self writeToLog:[NSString stringWithFormat:@"外围设备寻找服务过程中发生错误，错误信息：%@",error.localizedDescription]];
}
//遍历查找到的服务
CBUUID *serviceUUID=[CBUUID UUIDWithString:kServiceUUID];
CBUUID *characteristicUUID=[CBUUID UUIDWithString:kCharacteristicUUID];
for (CBService *service in peripheral.services) {
if([service.UUID isEqual:serviceUUID]){
//外围设备查找指定服务中的特征
[peripheral discoverCharacteristics:@[characteristicUUID] forService:service];
}
}
}
//外围设备寻找到特征后
-(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
NSLog(@"已发现可用特征...");
[self writeToLog:@"已发现可用特征..."];
if (error) {
NSLog(@"外围设备寻找特征过程中发生错误，错误信息：%@",error.localizedDescription);
[self writeToLog:[NSString stringWithFormat:@"外围设备寻找特征过程中发生错误，错误信息：%@",error.localizedDescription]];
}
//遍历服务中的特征
CBUUID *serviceUUID=[CBUUID UUIDWithString:kServiceUUID];
CBUUID *characteristicUUID=[CBUUID UUIDWithString:kCharacteristicUUID];
if ([service.UUID isEqual:serviceUUID]) {
for (CBCharacteristic *characteristic in service.characteristics) {
if ([characteristic.UUID isEqual:characteristicUUID]) {
//情景一：通知
/*找到特征后设置外围设备为已通知状态（订阅特征）：
*1.调用此方法会触发代理方法：-(void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
*2.调用此方法会触发外围设备的订阅代理方法
*/
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
//情景二：读取
// [peripheral readValueForCharacteristic:characteristic];
// if(characteristic.value){
// NSString *value=[[NSString alloc]initWithData:characteristic.value encoding:NSUTF8StringEncoding];
// NSLog(@"读取到特征值：%@",value);
// }
}
}
}
}
//特征值被更新后
-(void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
NSLog(@"收到特征更新通知...");
[self writeToLog:@"收到特征更新通知..."];
if (error) {
NSLog(@"更新通知状态时发生错误，错误信息：%@",error.localizedDescription);
}
//给特征值设置新的值
CBUUID *characteristicUUID=[CBUUID UUIDWithString:kCharacteristicUUID];
if ([characteristic.UUID isEqual:characteristicUUID]) {
if (characteristic.isNotifying) {
if (characteristic.properties==CBCharacteristicPropertyNotify) {
NSLog(@"已订阅特征通知.");
[self writeToLog:@"已订阅特征通知."];
return;
}else if (characteristic.properties ==CBCharacteristicPropertyRead) {
//从外围设备读取新值,调用此方法会触发代理方法：-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
[peripheral readValueForCharacteristic:characteristic];
}
}else{
NSLog(@"停止已停止.");
[self writeToLog:@"停止已停止."];
//取消连接
[self.centralManager cancelPeripheralConnection:peripheral];
}
}
}
//更新特征值后（调用readValueForCharacteristic:方法或者外围设备在订阅后更新特征值都会调用此代理方法）
-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
if (error) {
NSLog(@"更新特征值时发生错误，错误信息：%@",error.localizedDescription);
[self writeToLog:[NSString stringWithFormat:@"更新特征值时发生错误，错误信息：%@",error.localizedDescription]];
return;
}
if (characteristic.value) {
NSString *value=[[NSString alloc]initWithData:characteristic.value encoding:NSUTF8StringEncoding];
NSLog(@"读取到特征值：%@",value);
[self writeToLog:[NSString stringWithFormat:@"读取到特征值：%@",value]];
}else{
NSLog(@"未发现特征值.");
[self writeToLog:@"未发现特征值."];
}
}
#pragma mark - 属性
-(NSMutableArray *)peripherals{
if(!_peripherals){
_peripherals=[NSMutableArray array];
}
return _peripherals;
}
#pragma mark - 私有方法
/**
* 记录日志
*
* @param info 日志信息
*/
-(void)writeToLog:(NSString *)info{
self.log.text=[NSString stringWithFormat:@"%@\r\n%@",self.log.text,info];
}
@end
