iOS 藍芽開發（三）app作為外設被串連的實現(轉)

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　　　　　　　　　　　　　　　　轉載自:www.cocoachina.com/ios/20151105/14071.html

　　　　　　　　　　　　　　　　　　　　　　　　　　原劉彥瑋

再上一節說了app作為central串連peripheral的情況，這一節介紹如何使用app發布一個peripheral，給其他的central串連

還是這張圖，central模式用的都是左邊的類，而peripheral模式用的是右邊的類

peripheral模式的流程

1. 開啟peripheralManager，設定peripheralManager的委託

2. 建立characteristics，characteristics的description 建立service，把characteristics添加到service中，再把service添加到peripheralManager中

3. 開啟廣播advertising

4. 對central的操作進行響應

    - 4.1 讀characteristics請求

    - 4.2 寫characteristics請求

    - 4.4 訂閱和取消訂閱characteristics

準備環境

  1 Xcode

  2 開發認證和手機（藍芽程式需要使用使用真機調試，使用模擬器也可以調試，但是方法很蛋疼，我會放在最後說），如果不行可以使用osx程式調試

  3 藍芽外設

實現步驟

1. 開啟peripheralManager，設定peripheralManager的委託

設定當前ViewController實現CBPeripheralManagerDelegate委託

    @interface BePeripheralViewController : UIViewController

初始化peripheralManager

     /*     和CBCentralManager類似，藍牙裝置開啟需要一定時間，開啟成功後會進入委託方法     - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral;     模擬器永遠也不會得CBPeripheralManagerStatePoweredOn狀態     */    peripheralManager = [[CBPeripheralManager alloc]initWithDelegate:self queue:nil];

2. 建立characteristics，characteristics的description ，建立service，把characteristics添加到service中，再把service添加到peripheralManager中

在 委託方法 - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral中，當peripheral成功開啟後，才可以配置service和characteristics。 這裡建立的service和chara對象是CBMutableCharacteristic和CBMutableService。他們的區別就像 NSArray和NSMutableArray區別類似。 我們先建立characteristics和description，description是characteristics的描述，描述分很多種， 這裡不細說了，常用的就是CBUUIDCharacteristicUserDescriptionString。

//peripheralManager狀態改變- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral{    switch (peripheral.state) {            //在這裡判斷藍芽設別的狀態  當開啟了則可調用  setUp方法(自訂)        case CBPeripheralManagerStatePoweredOn:            NSLog(@"powered on");            [info setText:[NSString stringWithFormat:@"裝置名稱%@已經開啟，可以使用center進行串連",LocalNameKey]];            [self setUp];            break;        case CBPeripheralManagerStatePoweredOff:            NSLog(@"powered off");            [info setText:@"powered off"];            break;        default:            break;    }}

 //配置bluetooch的 -(void)setUp{        //characteristics欄位描述        CBUUID *CBUUIDCharacteristicUserDescriptionStringUUID = [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString];        /*         可以通知的Characteristic         properties：CBCharacteristicPropertyNotify         permissions CBAttributePermissionsReadable         */        CBMutableCharacteristic *notiyCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:notiyCharacteristicUUID] properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsReadable];        /*         可讀寫的characteristics         properties：CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead         permissions CBAttributePermissionsReadable | CBAttributePermissionsWriteable         */        CBMutableCharacteristic *readwriteCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:readwriteCharacteristicUUID] properties:CBCharacteristicPropertyWrite | CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable | CBAttributePermissionsWriteable];        //設定description        CBMutableDescriptor *readwriteCharacteristicDescription1 = [[CBMutableDescriptor alloc]initWithType: CBUUIDCharacteristicUserDescriptionStringUUID value:@"name"];        [readwriteCharacteristic setDescriptors:@[readwriteCharacteristicDescription1]];        /*         唯讀Characteristic         properties：CBCharacteristicPropertyRead         permissions CBAttributePermissionsReadable         */        CBMutableCharacteristic *readCharacteristic = [[CBMutableCharacteristic alloc]initWithType:[CBUUID UUIDWithString:readCharacteristicUUID] properties:CBCharacteristicPropertyRead value:nil permissions:CBAttributePermissionsReadable];        //service1初始化並加入兩個characteristics        CBMutableService *service1 = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:ServiceUUID1] primary:YES];        [service1 setCharacteristics:@[notiyCharacteristic,readwriteCharacteristic]];        //service2初始化並加入一個characteristics        CBMutableService *service2 = [[CBMutableService alloc]initWithType:[CBUUID UUIDWithString:ServiceUUID2] primary:YES];        [service2 setCharacteristics:@[readCharacteristic]];        //添加後就會調用代理的- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error        [peripheralManager addService:service1];        [peripheralManager addService:service2]; }

3. 開啟廣播advertising

//perihpheral添加了service- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error{    if (error == nil) {        serviceNum++;    }    //因為我們添加了2個服務，所以想兩次都添加完成後才去發送廣播    if (serviceNum==2) {        //添加服務後可以在此向外界發出通告 調用完這個方法後會調用代理的        //(void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error        [peripheralManager startAdvertising:@{                                              CBAdvertisementDataServiceUUIDsKey : @[[CBUUID UUIDWithString:ServiceUUID1],[CBUUID UUIDWithString:ServiceUUID2]],                                              CBAdvertisementDataLocalNameKey : LocalNameKey                                             }         ];    }}//peripheral開始發送advertising- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error{    NSLog(@"in peripheralManagerDidStartAdvertisiong");}

4. 對central的操作進行響應

- 4.1 讀characteristics請求

- 4.2 寫characteristics請求

- 4.3 訂閱和取消訂閱characteristics

//訂閱characteristics-(void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic{    NSLog(@"訂閱了 %@的資料",characteristic.UUID);    //每秒執行一次給主裝置發送一個目前時間的秒數    timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(sendData:) userInfo:characteristic  repeats:YES];}//取消訂閱characteristics-(void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic{    NSLog(@"取消訂閱 %@的資料",characteristic.UUID);    //取消回應    [timer invalidate];}//發送資料，發送目前時間的秒數-(BOOL)sendData:(NSTimer *)t {    CBMutableCharacteristic *characteristic = t.userInfo;    NSDateFormatter *dft = [[NSDateFormatter alloc]init];    [dft setDateFormat:@"ss"];    NSLog(@"%@",[dft stringFromDate:[NSDate date]]);    //執行回應Central通知數據    return  [peripheralManager updateValue:[[dft stringFromDate:[NSDate date]] dataUsingEncoding:NSUTF8StringEncoding] forCharacteristic:(CBMutableCharacteristic *)characteristic onSubscribedCentrals:nil];}//讀characteristics請求- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request{    NSLog(@"didReceiveReadRequest");    //判斷是否有讀資料的許可權    if (request.characteristic.properties & CBCharacteristicPropertyRead) {        NSData *data = request.characteristic.value;        [request setValue:data];        //對請求作出成功響應        [peripheralManager respondToRequest:request withResult:CBATTErrorSuccess];    }else{        [peripheralManager respondToRequest:request withResult:CBATTErrorWriteNotPermitted];    }}//寫characteristics請求- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray *)requests{    NSLog(@"didReceiveWriteRequests");    CBATTRequest *request = requests[0];    //判斷是否有寫資料的許可權    if (request.characteristic.properties & CBCharacteristicPropertyWrite) {        //需要轉換成CBMutableCharacteristic對象才能進行寫值        CBMutableCharacteristic *c =(CBMutableCharacteristic *)request.characteristic;        c.value = request.value;        [peripheralManager respondToRequest:request withResult:CBATTErrorSuccess];    }else{        [peripheralManager respondToRequest:request withResult:CBATTErrorWriteNotPermitted];    }}

代碼下載:

我部落格中大部分範例程式碼都上傳到了github，地址是：https://github.com/coolnameismy/demo，點擊跳轉代碼

本文代碼存放目錄是BleDemo

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iOS 藍芽開發（三）app作為外設被串連的實現(轉)