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iOS中的蓝牙

2017-02-26  本文已影响831人  mian小爬

iOS中的蓝牙

概述

iOS中提供了4个框架用于实现蓝牙连接

设计到的系统/框架

GameKit用法

一.准备工作

// 图片
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

// 建立连接
- (IBAction)buildConnect:(id)sender{}

// 发送数据
- (IBAction)sendData:(id)sender{}

二.连接蓝牙

- (IBAction)buildConnect:(id)sender {
    // 创建弹窗
    GKPeerPickerController *ppc = [[GKPeerPickerController alloc] init];
    // 设置代理  @interface ViewController () <GKPeerPickerControllerDelegate>
    ppc.delegate = self;
    // 展示
    [ppc show];
}

#pragma mark -GKPeerPickerControllerDelegate
// 连接成功就会调用
- (void)peerPickerController:(GKPeerPickerController *)picker // 弹窗
              didConnectPeer:(NSString *)peerID // 连接到的蓝牙设备号
                   toSession:(GKSession *)session // 连接会话(通过它进行数据交互)
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 弹窗消失
    [picker dismiss];
}

三.利用蓝牙传输数据

    // 手势-点击从相册中选一张照片
- (IBAction)tapImage:(UITapGestureRecognizer *)sender {
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 先判断是否有相册
    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        return;
    }
    // 创建弹出的控制器
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    // 设置图片来源为相册
    ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    // 设置代理 @interface ViewController () <UINavigationControllerDelegate, UIImagePickerControllerDelegate>
    ipc.delegate = self;
    // modal出来
    [self presentViewController:ipc animated:YES completion:nil];
}
#pragma mark - UINavigationControllerDelegate, UIImagePickerControllerDelegate
// 选中某图片后调用
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    // 控制器返回
    [picker dismissViewControllerAnimated:YES completion:nil];
    // 设置图片
    self.imageView.image = info[UIImagePickerControllerOriginalImage];
}

@property (nonatomic, strong) GKSession *session; /**< 蓝牙连接会话 */

// 连接成功就会调用
- (void)peerPickerController:(GKPeerPickerController *)picker // 弹窗
              didConnectPeer:(NSString *)peerID // 连接到的蓝牙设备号
                   toSession:(GKSession *)session // 连接会话(通过它进行数据交互)
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 弹窗消失
    [picker dismiss];
    // 保存会话
    self.session = session;
}

// 发送数据
- (IBAction)sendData:(id)sender {
    if (self.imageView.image == nil) return; // 有图片才继续执行
    // 通过蓝牙链接会话发送数据到所有设备
    [self.session sendDataToAllPeers:UIImagePNGRepresentation(self.imageView.image) // 数据
                        withDataMode:GKSendDataReliable // 枚举:发完为止
                               error:nil];

}

// 连接成功就会调用
- (void)peerPickerController:(GKPeerPickerController *)picker // 弹窗
              didConnectPeer:(NSString *)peerID // 连接到的蓝牙设备号
                   toSession:(GKSession *)session // 连接会话(通过它进行数据交互)
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 弹窗消失
    [picker dismiss];
    // 保存会话
    self.session = session;
    // 处理接收到的数据[蓝牙设备接收到数据时,就会调用 [self receiveData:fromPeer:inSession:context:]]
    // 设置数据接受者为:self
    [self.session setDataReceiveHandler:self
                       withContext:nil];
}
#pragma mark - 蓝牙设备接收到数据时,就会调用
- (void)receiveData:(NSData *)data // 数据
           fromPeer:(NSString *)peer // 来自哪个设备
          inSession:(GKSession *)session // 连接会话
            context:(void *)context
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 显示
    self.imageView.image = [UIImage imageWithData:data];
    // 写入相册
    UIImageWriteToSavedPhotosAlbum(self.imageView.image, nil, nil, nil);
}

四.注意

MultipeerConnectivity

常用类

类似sockaddr，用于标识连接的两端endpoint，通常是昵称或设备名称。

该对象只开放了displayName属性，私有MCPeerIDInternal对象持有的设备相关的_idString/_pid64字段并未公开。
在许多情况下，客户端同时广播并发现同一个服务，这将导致一些混乱，尤其是在client/server模式中。所以，每一个服务都应有一个类型标示符——serviceType，它是由ASCII字母、数字和“-”组成的短文本串，最多15个字符。

类似broadcaster,可以接收，并处理用户请求连接的响应。但是，这个类会有回调，告知有用户要与您的设备连接，然后可以自定义提示框，以及自定义连接处理。

主线程（com.apple.main-thread(serial)）创建MCNearbyServiceAdvertiser并启动startAdvertisingPeer。
MCNearbyServiceAdvertiserDelegate异步回调（didReceiveInvitationFromPeer）切换回主线程。
在主线程didReceiveInvitationFromPeer中创建MCSession并invitationHandler(YES, session)接受会话连接请求（accept参数为YES）。

类似servo listen+client connect,用于搜索附近的用户，并可以对搜索到的用户发出邀请加入某个会话中。
主线程（com.apple.main-thread(serial)）创建MCNearbyServiceBrowser并启动startBrowsingForPeers。
MCNearbyServiceBrowserDelegate异步回调（foundPeer/lostPeer）切换回主线程。
主线程创建MCSession并启动invitePeer。

启用和管理Multipeer连接会话中的所有人之间的沟通。 通过Sesion，给别人发送数据
注意，peerID并不具备设备识别属性。
类似TCP链接中的socket。创建MCSession时，需指定自身MCPeerID，类似bind。
为避免频繁的会话数据通知阻塞主线程，MCSessionDelegate异步回调（didChangeState/didReceiveCertificate/didReceiveData/didReceiveStream）有一个专门的回调线程——com.apple.MCSession.callbackQueue(serial)。为避免阻塞MCSeesion回调线程，最好新建数据读（写）线程！

MCAdvertiserAssistant //可以接收，并处理用户请求连接的响应。没有回调，会弹出默认的提示框，并处理连接。
MCBrowserViewController 弹出搜索框,需要手动modal

MCAdvertiserAssistant为针对Advertiser封装的管理助手；MCBrowserViewController继承自UIViewController，提供了基本的UI应用框架。
MCBrowser/MCAdvertiser的回调线程一般是delegate所在线程Queue：com.apple.main-thread(serial)。

ExteralAccessory

baseK(相关基础知识)

蓝牙常见名称和缩写

蓝牙基础知识

typedef NS_OPTIONS(NSUInteger, CBCharacteristicProperties) {
    CBCharacteristicPropertyBroadcast                                               = 0x01,
    CBCharacteristicPropertyRead                                                    = 0x02,
    CBCharacteristicPropertyWriteWithoutResponse                                    = 0x04,
    CBCharacteristicPropertyWrite                                                   = 0x08,
    CBCharacteristicPropertyNotify                                                  = 0x10,
    CBCharacteristicPropertyIndicate                                                = 0x20,
    CBCharacteristicPropertyAuthenticatedSignedWrites                               = 0x40,
    CBCharacteristicPropertyExtendedProperties                                      = 0x80,
    CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)     = 0x100,
    CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)   = 0x200
};

BLE中心模式流程

BLE外设模式流程

蓝牙设备的状态

蓝牙设备的五种工作状态

蓝牙和版本使用限制

BLE测试

BLE中心模式流程-coding

BLE中心模式流程

准备环境

实现步骤

1.导入CB头文件,建立主设备管理类,设置主设备代理

#import <CoreBluetooth/CoreBluetooth.h>
@interface XMGBLEController () <CBCentralManagerDelegate>
@property (nonatomic, strong) CBCentralManager *cMgr; /**< 中心管理设备 */
@end
@implementation XMGBLEController
#pragma mark - 懒加载
// 1.建立中心管理者
- (CBCentralManager *)cMgr
{
    if (!_cMgr) {
        NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
        /*
         设置主设备的代理,CBCentralManagerDelegate
         必须实现的：
         - (void)centralManagerDidUpdateState:(CBCentralManager *)central;//主设备状态改变调用，在初始化CBCentralManager的适合会打开设备，只有当设备正确打开后才能使用
         其他选择实现的委托中比较重要的：
         - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI; //找到外设
         - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral;//连接外设成功
         - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//外设连接失败
         - (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//断开外设
         */
        _cMgr = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()]; // 线程不传默认是主线程
    }
    return _cMgr;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"BLE";
    self.view.backgroundColor = [UIColor orangeColor];
    // 初始化
    [self cMgr];
    // 不能在此处扫描,因为状态还没变为打开
    //[self.cMgr scanForPeripheralsWithServices:nil options:nil];
}

2.扫描外设

#pragma mark - CBCentralManagerDelegate
// 中心管理者状态改变, 在初始化CBCentralManager的时候会打开设备，只有当设备正确打开后才能使用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    switch (central.state) {
        case CBCentralManagerStateUnknown:
            NSLog(@">>>CBCentralManagerStateUnknown");
            break;
        case CBCentralManagerStateResetting:
            NSLog(@">>>CBCentralManagerStateResetting");
            break;
        case CBCentralManagerStateUnsupported:
            NSLog(@">>>CBCentralManagerStateUnsupported");
            break;
        case CBCentralManagerStateUnauthorized:
            NSLog(@">>>CBCentralManagerStateUnauthorized");
            break;
        case CBCentralManagerStatePoweredOff:
            NSLog(@">>>CBCentralManagerStatePoweredOff");
            break;
        case CBCentralManagerStatePoweredOn:
            NSLog(@">>>CBCentralManagerStatePoweredOn");
            // 2.开始扫描周围的外设
            /*
             第一个参数nil就是扫描周围所有的外设，扫描到外设后会进入
             - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI;
             */
            [self.cMgr scanForPeripheralsWithServices:nil options:nil];

            break;
        default:
        break;
    }
}
// 扫描到设备会进入到此代理方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSLog(@"%s, line = %d, per = %@, data = %@, rssi = %@", __FUNCTION__, __LINE__, peripheral, advertisementData, RSSI);
    // 接下来连接设备
}

3.连接外设

// 扫描到设备会进入到此代理方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSLog(@"%s, line = %d, per = %@, data = %@, rssi = %@", __FUNCTION__, __LINE__, peripheral, advertisementData, RSSI);

    // 3.接下来可以连接设备
    //如果你没有设备，可以下载一个app叫lightbule的app去模拟一个设备
    //这里自己去设置下连接规则，我设置的是二维码扫描到的运动手环的设备号
    // 判断设备号是否扫描到
    if ([peripheral.name isEqualToString:@"OBand-75"]) {
        /*
         一个主设备最多能连7个外设，每个外设最多只能给一个主设备连接,连接成功，失败，断开会进入各自的委托
         - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral;//连接外设成功的委托
         - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//外设连接失败的委托
         - (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//断开外设的委托
         */
        // 保存外设,否则方法结束就销毁
        self.per = peripheral;
        [self.cMgr connectPeripheral:self.per options:nil];
    }else
    {
        // 此处Alert提示未扫描到设备,重新扫描
#warning noCode
        NSLog(@"没扫描到 >>>>>>>>  %s, line = %d", __FUNCTION__, __LINE__);
    }
}
// 外设连接成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    NSLog(@">>>连接到名称为（%@）的设备-成功",peripheral.name);
}
// 外设连接失败
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 断开连接(丢失连接)
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}

4.扫描外设中的服务和特征

  设备链接成功后,就可以扫描设备的服务(services)了,同样是通过代理,扫描到结果后会触发某代理方法.
  注意:此时CBCentralManagerDelegate已经不能满足需求,需要新的CBPeripheralDelegate来搞定.
  该协议中包含了central与peripheral的许多回调方法
  (eg.:获取services,获取characteristics,获取characteristics的值,获取characteristics的Descriptor以及Descriptor的值,写数据,读RSSI,用通知的方式订阅数据等等).


// 外设连接成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    NSLog(@">>>连接到名称为（%@）的设备-成功",peripheral.name);
    //设置的peripheral代理CBPeripheralDelegate
    //@interface ViewController : UIViewController<CBCentralManagerDelegate,CBPeripheralDelegate>
    [peripheral setDelegate:self];

    //扫描外设Services，成功后会进入方法：-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    [peripheral discoverServices:nil];
    /*
     Discovers the specified services of the peripheral.
     An array of CBUUID objects that you are interested in. Here, each CBUUID object represents a UUID that identifies the type of service you want to discover.
     */
}

#pragma mark - CBPeripheralDelegate
// 发现外设的service
- (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.UUID = %@", service.UUID);
        //扫描每个service的Characteristics，扫描到后会进入方法： -(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
        [peripheral discoverCharacteristics:nil forService:service];
    }
}

// 外设发现service的特征
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    if (error)
    {
        NSLog(@"error Discovered characteristics for %@ with error: %@", service.UUID, [error localizedDescription]);
        return;
    }
    for (CBCharacteristic *characteristic in service.characteristics)
    {
        NSLog(@"service:%@ 的 Characteristic: %@",service.UUID,characteristic.UUID);
    }

#warning noCodeFor 优化,分开写是为了让大家看注释清晰,并不符合编码规范
    //获取Characteristic的值，读到数据会进入方法：-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
    for (CBCharacteristic *characteristic in service.characteristics){
        [peripheral readValueForCharacteristic:characteristic]; // 外设读取特征的值
    }

    //搜索Characteristic的Descriptors，读到数据会进入方法：-(void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
    for (CBCharacteristic *characteristic in service.characteristics){
        [peripheral discoverDescriptorsForCharacteristic:characteristic]; // 外设发现特征的描述
    }
}

// 获取characteristic的值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{
    //打印出characteristic的UUID和值
    //!注意，value的类型是NSData，具体开发时，会根据外设协议制定的方式去解析数据
    NSLog(@"%s, line = %d, characteristic.UUID:%@  value:%@", __FUNCTION__, __LINE__, characteristic.UUID, characteristic.value);
}
// 获取Characteristics的 descriptor的值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForDescriptor:(nonnull CBDescriptor *)descriptor error:(nullable NSError *)error
{
    //打印出DescriptorsUUID 和value
    //这个descriptor都是对于characteristic的描述，一般都是字符串，所以这里我们转换成字符串去解析
    NSLog(@"%s, line = %d, descriptor.UUID:%@ value:%@", __FUNCTION__, __LINE__, descriptor.UUID, descriptor.value);
}
// 发现特征Characteristics的描述Descriptor
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    for (CBDescriptor *descriptor in characteristic.descriptors) {
        NSLog(@"descriptor.UUID:%@",descriptor.UUID);
    }
}

5.写数据到特征中

// 5.将数据写入特征(自定义方法,为了看的更清楚,没别的意思)
- (void)yf_peripheral:(CBPeripheral *)peripheral writeData:(NSData *)data forCharacteristic:(CBCharacteristic *)characteristic
{
    /*
    typedef NS_OPTIONS(NSUInteger, CBCharacteristicProperties) {
        CBCharacteristicPropertyBroadcast                                               = 0x01,
        CBCharacteristicPropertyRead                                                    = 0x02,
        CBCharacteristicPropertyWriteWithoutResponse                                    = 0x04,
        CBCharacteristicPropertyWrite                                                   = 0x08,
        CBCharacteristicPropertyNotify                                                  = 0x10,
        CBCharacteristicPropertyIndicate                                                = 0x20,
        CBCharacteristicPropertyAuthenticatedSignedWrites                               = 0x40,
        CBCharacteristicPropertyExtendedProperties                                      = 0x80,
        CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)     = 0x100,
        CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)   = 0x200
    };
     打印出特征的权限(characteristic.properties),可以看到有很多种,这是一个NS_OPTIONS的枚举,可以是多个值
     常见的又read,write,noitfy,indicate.知道这几个基本够用了,前俩是读写权限,后俩都是通知,俩不同的通知方式
     */
    NSLog(@"%s, line = %d, characteristic.properties:%d", __FUNCTION__, __LINE__, characteristic.properties);

    // 只有特征的properties中有写的属性时候,才写
    if (characteristic.properties & CBCharacteristicPropertyWrite) {
        // 这句才是正宗的核心代码
        [peripheral writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
    }
}

6.订阅特征的通知

// 设置通知
- (void)yf_peripheral:(CBPeripheral *)peripheral setNotifyForCharacteristic:(CBCharacteristic *)characteristic
{
    // 设置通知, 数据会进入 peripheral:didUpdateValueForCharacteristic:error:方法
    [peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
// 取消通知
- (void)yf_peripheral:(CBPeripheral *)peripheral cancelNotifyForCharacteristic:(CBCharacteristic *)characteristic
{
    [peripheral setNotifyValue:NO forCharacteristic:characteristic];
}

7.断开连接

// 7.断开连接
- (void)yf_cMgr:(CBCentralManager *)cMgr stopScanAndDisConnectWithPeripheral:(CBPeripheral *)peripheral
{
    // 停止扫描
    [cMgr stopScan];
    // 断开连接
    [cMgr cancelPeripheralConnection:peripheral];
}

BLE-periphral外设模式流程

之前在基础知识介绍过BLE应用的两种流程

peripheral模式的流程

准备环境

具体操作步骤

1.引入CoreBluetooth框架,初始化peripheralManager

#import <CoreBluetooth/CoreBluetooth.h>
@interface XMGBLEPeripheralViewController () <CBPeripheralManagerDelegate>
@property (nonatomic, strong) CBPeripheralManager *pMgr; /**< 外设管理者 */
@end

@implementation XMGBLEPeripheralViewController
// 懒加载
- (CBPeripheralManager *)pMgr
{
    if (!_pMgr) {
        _pMgr = [[CBPeripheralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
    }
    return _pMgr;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // 调用get方法初始化,初始化后CBPeripheralManager状态改变会调用代理方法peripheralManagerDidUpdateState:
    // 模拟器永远也不会是CBPeripheralManagerStatePoweredOn状态
    [self pMgr];
}

2.设置peripheralManager中的内容

#pragma mark - CBPeripheralManagerDelegate
// CBPeripheralManager初始化后会触发的方法
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
    if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
        // 提示设备成功打开
        [SVProgressHUD showSuccessWithStatus:@"xmg设备打开成功~"];
        // 配置各种服务入CBPeripheralManager
        [self yf_setupPMgr];
    }else
    {
        // 提示设备打开失败
        [SVProgressHUD showErrorWithStatus:@"失败!"];
    }
}

#pragma mark - 私有方法
- (void)yf_setupPMgr
{
    // 特征描述的UUID
    CBUUID *characteristicUserDescriptionUUID = [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString];
    // 特征的通知UUID
    CBUUID *notifyCharacteristicUUID = [CBUUID UUIDWithString:notiyCharacteristicStrUUID];
    // 特征的读写UUID
    CBUUID *readwriteCharacteristicUUID = [CBUUID UUIDWithString:readwriteCharacteristicStrUUID];
    // 特征的只读UUID
    CBUUID *readCharacteristicUUID = [CBUUID UUIDWithString:readwriteCharacteristicStrUUID];
    CBUUID *ser1UUID = [CBUUID UUIDWithString:Service1StrUUID];
    CBUUID *ser2UUID = [CBUUID UUIDWithString:Service2StrUUID];


    // 初始化一个特征的描述
    CBMutableDescriptor *des1 = [[CBMutableDescriptor alloc] initWithType:characteristicUserDescriptionUUID value:@"xmgDes1"];

    // 可通知的特征
    CBMutableCharacteristic *notifyCharacteristic = [[CBMutableCharacteristic alloc] initWithType:notifyCharacteristicUUID // UUID
                                                                                       properties:CBCharacteristicPropertyNotify // 枚举:通知
                                                                                            value:nil // 数据先不传
                                                                                      permissions:CBAttributePermissionsReadable]; // 枚举:可读
    // 可读写的特征
    CBMutableCharacteristic *readwriteChar = [[CBMutableCharacteristic alloc] initWithType:readwriteCharacteristicUUID
                                                                                properties:CBCharacteristicPropertyRead | CBCharacteristicPropertyWrite
                                                                                     value:nil
                                                                               permissions:CBAttributePermissionsReadable | CBAttributePermissionsWriteable];
    [readwriteChar setDescriptors:@[des1]]; // 设置特征的描述

    // 只读特征
    CBMutableCharacteristic *readChar = [[CBMutableCharacteristic alloc] initWithType:readCharacteristicUUID
                                                                           properties:CBCharacteristicPropertyRead
                                                                                value:nil
                                                                          permissions:CBAttributePermissionsReadable];

    // 初始化服务1
    CBMutableService *ser1 = [[CBMutableService alloc] initWithType:ser1UUID primary:YES];
    // 为服务设置俩特征(通知, 带描述的读写)
    [ser1 setCharacteristics:@[notifyCharacteristic, readwriteChar]];

    // 初始化服务2,并且添加一个只读特征
    CBMutableService *ser2 = [[CBMutableService alloc] initWithType:ser2UUID primary:YES];
    ser2.characteristics = @[readChar];

    // 添加服务进外设管理者
    // 添加操作会触发代理方法peripheralManager:didAddService:error:
    [self.pMgr addService:ser1];
    [self.pMgr addService:ser2];
}

3.开启广播

// 添加服务进CBPeripheralManager时会触发的方法
- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error
{
    // 由于添加了两次ser,所以方法会调用两次
    static int i = 0;
    if (!error) {
        i++;
    }

    // 当第二次进入方法时候,代表两个服务添加完毕,此时要用到2,由于没有扩展性,所以新增了可变数组,记录添加的服务数量
    if (i == self.servieces.count) {
        // 广播内容
        NSDictionary *advertDict = @{CBAdvertisementDataServiceUUIDsKey: [self.servieces valueForKeyPath:@"UUID"],
                                     CBAdvertisementDataLocalNameKey:LocalNameKey};
        // 发出广播,会触发peripheralManagerDidStartAdvertising:error:
        [peripheral startAdvertising:advertDict];
    }
}
// 开始广播触发的代理
- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error
{

}

>>>>>>>>分割线>>>>下面是修改的地方

@property (nonatomic, strong) NSMutableArray *servieces; /**< 服务可变数组 */
// 自定义服务
- (NSMutableArray *)servieces
{
    if (!_servieces) {
        _servieces = [NSMutableArray array];
    }
    return _servieces;
}
#pragma mark - 私有方法
- (void)yf_setupPMgr
{
    ...

    // 初始化服务1
    CBMutableService *ser1 = [[CBMutableService alloc] initWithType:ser1UUID primary:YES];
    // 为服务设置俩特征(通知, 带描述的读写)
    [ser1 setCharacteristics:@[notifyCharacteristic, readwriteChar]];
    [self.servieces addObject:ser1];

    // 初始化服务2,并且添加一个只读特征
    CBMutableService *ser2 = [[CBMutableService alloc] initWithType:ser2UUID primary:YES];
    ser2.characteristics = @[readChar];
    [self.servieces addObject:ser2];

    // 添加服务进外设管理者
    // 添加操作会触发代理方法peripheralManager:didAddService:error:
    if (self.servieces.count) {
        for (CBMutableService *ser in self.servieces) {
            [self.pMgr addService:ser];
        }
    }
}

4.对central的操作做出响应

// 外设收到读的请求,然后读特征的值赋值给request
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 判断是否可读
    if (request.characteristic.properties & CBCharacteristicPropertyRead) {
        NSData *data = request.characteristic.value;

        request.value = data;
        // 对请求成功做出响应
        [self.pMgr respondToRequest:request withResult:CBATTErrorSuccess];
    }else
    {
        [self.pMgr respondToRequest:request withResult:CBATTErrorWriteNotPermitted];
    }
}
// 外设收到写的请求,然后读request的值,写给特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray<CBATTRequest *> *)requests
{
    NSLog(@"%s, line = %d, requests = %@", __FUNCTION__, __LINE__, requests);
    CBATTRequest *request = requests.firstObject;
    if (request.characteristic.properties & CBCharacteristicPropertyWrite) {
        NSData *data = request.value;
        // 此处赋值要转类型,否则报错
        CBMutableCharacteristic *mChar = (CBMutableCharacteristic *)request.characteristic;
        mChar.value = data;
        // 对请求成功做出响应
        [self.pMgr respondToRequest:request withResult:CBATTErrorSuccess];
    }else
    {
        [self.pMgr respondToRequest:request withResult:CBATTErrorWriteNotPermitted];
    }
}


// 与CBCentral的交互
// 订阅特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic
{
    NSLog(@"%s, line = %d, 订阅了%@的数据", __FUNCTION__, __LINE__, characteristic.UUID);
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0
                                                      target:self
                                                    selector:@selector(yf_sendData:)
                                                    userInfo:characteristic
                                                     repeats:YES];

    self.timer = timer;

    /* 另一种方法 */
//    NSTimer *testTimer = [NSTimer timerWithTimeInterval:2.0
//                                                 target:self
//                                               selector:@selector(yf_sendData:)
//                                               userInfo:characteristic
//                                                repeats:YES];
//    [[NSRunLoop currentRunLoop] addTimer:testTimer forMode:NSDefaultRunLoopMode];

}
// 取消订阅特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic
{
    NSLog(@"%s, line = %d, 取消订阅了%@的数据", __FUNCTION__, __LINE__, characteristic.UUID);
    [self.timer invalidate];
    self.timer = nil;
}

- (void)peripheralManagerIsReadyToUpdateSubscribers:(CBPeripheralManager *)peripheral
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}

// 计时器每隔两秒调用的方法
- (BOOL)yf_sendData:(NSTimer *)timer
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yy:MM:dd:HH:mm:ss";

    NSString *now = [dateFormatter stringFromDate:[NSDate date]];
    NSLog(@"now = %@", now);

    // 执行回应central通知数据
    return  [self.pMgr updateValue:[now dataUsingEncoding:NSUTF8StringEncoding]
         forCharacteristic:timer.userInfo
      onSubscribedCentrals:nil];
}

iBeacon简介

简单开发流程

#import <CoreLocation/CoreLocation.h>

@interface AppDelegate () <CLLocationManagerDelegate>

@property (nonatomic, strong) CLBeaconRegion *beaconRegion; /**< beacon区域 */

@property (nonatomic, strong) CLLocationManager *locMgr; /**< 位置管理者 */

@end

@implementation AppDelegate
#pragma mark - lazy
// 懒加载iBeacon区域
- (CLBeaconRegion *)beaconRegion
{
    if (!_beaconRegion) {
        NSUUID *proximityUUID = [[NSUUID alloc] initWithUUIDString:@"416C0120-5960-4280-A67C-A2A9BB166D0F"];
        _beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:proximityUUID
                                                           identifier:@"brID"];
        /**
         *  一个App为了在特定商场提⾼高⽤用户体验,可⽤用使⽤用相同的proximity UUID来监听商场的所有商铺。当⽤用户进⼊入⼀一个商店时,App检测商铺的iBeacon设备并使⽤用major和 minor值来获取额外的信息,如⽤用户进⼊入哪家商店或⽤用户在商店的哪个区域(注意:虽然每个iBeacon都必须有⼀一个proximity UUID,但 major和minor的值是可选的)。
         */
    }
    return _beaconRegion;
}

// 懒加载创建地域管理者
- (CLLocationManager *)locMgr
{
    if (!_locMgr) {
        _locMgr = [[CLLocationManager alloc] init];
        _locMgr.delegate = self;
    }
    return _locMgr;
}

#pragma mark - CLLocationManagerDelegate

// 开始监听
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}

// 进入监控的region区域
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    if ([region isEqual:self.beaconRegion]) {
        // Start calculating ranges for beacons in the specified region.
        // 开始计算beaconRegion区域内部的iBeacon设备数量,确定我们的设备与区域中的一个或多个iBeacon设备的相对距离,并在距离改变时被通知,触发代理 didRangeBeacons
        [self.locMgr startRangingBeaconsInRegion:self.beaconRegion];

        NSDictionary *info = [self.beaconRegion peripheralDataWithMeasuredPower:@0];
        // 通知外设开启广播
        [[NSNotificationCenter defaultCenter] postNotificationName:@"didEnterRegionNotification" object:nil userInfo:info];
    }

}
// 退出监控的region区域
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
    // 外设关闭广播
    // 通知外设开启广播
    [[NSNotificationCenter defaultCenter] postNotificationName:@"didExitRegionNotification" object:nil];
}

// 当指定Beacon区域的iBeacon设备进⼊入范围、离开范围或相对距离改变时,CLLocationManager对象调⽤用代理对象的 locationManager:didRangeBeacons:inRegion:
- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray<CLBeacon *> *)beacons inRegion:(CLBeaconRegion *)region
{
    // beacons表⽰示当前设备范围内的iBeacon。
    // iBeacon的数组根据离设备的相对距离来排序,最近的在最前⾯面。
    // 我们可以使⽤用这些对象中的信息来确定⽤用户离每个iBeacon设备的距离。 CLBeacon对象(数组元素)的proximity属性给出了(手机)到⼀一个beacon的相对距离
    // 注意:iBeacon的排列依赖于检测到的BLE⽆无线信号的强度,以及这些信号受墙壁、门或其它物理实体的影响。当我们使⽤用iBeacon时需要考虑 这些影响因素。
    if (beacons.count) {
        for (NSInteger i = 0; i < beacons.count; i++) {
            CLBeacon *beacon = beacons[i];
            /**
             *  typedef NS_ENUM(NSInteger, CLProximity) {
             CLProximityUnknown,
             CLProximityImmediate,
             CLProximityNear,
             CLProximityFar
             } NS_ENUM_AVAILABLE_IOS(7_0) __WATCHOS_PROHIBITED;
             */
            if (beacon.proximity == CLProximityNear) {
                NSLog(@"major = %@|| minor = %@", beacon.major, beacon.minor);

                // 注意:当多个iBeacon设备广告了相同的proximityUUID, major和minor属性组合时,在locationManager:didRangeBeacons:inRegion:方法 中它们可能会有不同的距离与精度。建议每⼀一个beacon设备都是唯⼀一标识的。
            }else
            {

            }
        }
    }

}

// 报错
- (void)locationManager:(CLLocationManager *)manager rangingBeaconsDidFailForRegion:(CLBeaconRegion *)region withError:(NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}


#import <CoreBluetooth/CoreBluetooth.h>

@interface ViewController () <CBPeripheralManagerDelegate>

@property (nonatomic, strong) CBPeripheralManager *pMgr; /**< 外设管理模式 */

@end

@implementation ViewController

// 懒加载创建
- (CBPeripheralManager *)pMgr
{
    if (!_pMgr) {
        //
        _pMgr = [[CBPeripheralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
    }
    return _pMgr;
}


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    // 先初始化外设管理者
    [self pMgr];

    [[NSNotificationCenter defaultCenter] addObserverForName:@"didEnterRegionNotification"
                                                      object:nil
                                                       queue:[NSOperationQueue mainQueue]
                                                  usingBlock:^(NSNotification * _Nonnull note) {
                                                      // 开始广播位置信息proximity UUID(及major或minor值)
                                                      if (self.pMgr.state == CBPeripheralManagerStatePoweredOn) {
                                                          //
                                                          [self.pMgr startAdvertising:note.userInfo];
                                                      }
                                                  }];

    [[NSNotificationCenter defaultCenter] addObserverForName:@"didExitRegionNotification"
                                                      object:nil
                                                       queue:[NSOperationQueue mainQueue]
                                                  usingBlock:^(NSNotification * _Nonnull note) {
                                                      if (self.pMgr.isAdvertising) {
                                                          [self.pMgr stopAdvertising];
                                                      }
                                                  }];
}

- (void)dealloc
{
    // 实际上控制器中不写也不会出问题,此处只是为了 代码规范
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

#pragma mark - CBPeripheralManagerDelegate

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
    if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
        //
    }
}

AirDrop

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