iOS多点连接的使用（WIFI 蓝牙）

来源：互联网发布：淘宝王子解封编辑：程序博客网时间：2024/06/08 05:52

多点连接 API 的使用

SDK及版本信息

MultipeerConnectivity.frameworkiOS 7.0OS X 10.10

可以看到基于MC可以做到电脑与手机的通信。了解了其能力与SDK相关信息后，下面我们看看工作流程：使设备可被发现--->浏览设备，建立连接--->传输数据。关于使用大家可以看看参考资源与 MCDemo，这里只是做一个代码导读。
1、初始化 MCPeerID 及 MCSession， MCPeerID 用来唯一的标识设备， MCSession 是通信的基础：

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-(void)setupPeerAndSessionWithDisplayName:(NSString *)displayName{
    _peerID = [[MCPeerID alloc] initWithDisplayName:displayName];
     
    _session = [[MCSession alloc] initWithPeer:_peerID];
    _session.delegate = self;
}

2、广播设备，使设备可以被发现：

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-(void)advertiseSelf:(BOOL)shouldAdvertise{
    if(shouldAdvertise) {
        _advertiser = [[MCAdvertiserAssistant alloc] initWithServiceType:@chat-files
                                                           discoveryInfo:nil
                                                                 session:_session];
        [_advertiser start];
    }
    else{
        [_advertiser stop];
        _advertiser = nil;
    }
}

3、浏览“局域网”中的设备，并建立连接：

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-(void)setupMCBrowser{
    _browser = [[MCBrowserViewController alloc] initWithServiceType:@chat-files session:_session];
}

MCBrowserViewController实例化后，直接弹出，这个类内部会负责查找设备并建立连接。对于有界面定制化需求的，也可以通过相关接口实现类似的功能。
4、发送消息：

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-(void)sendMyMessage{
    NSData *dataToSend = [_txtMessage.text dataUsingEncoding:NSUTF8StringEncoding];
    NSArray *allPeers = _appDelegate.mcManager.session.connectedPeers;
    NSError *error;
     
    [_appDelegate.mcManager.session sendData:dataToSend
                                     toPeers:allPeers
                                    withMode:MCSessionSendDataReliable
                                       error:&error];
     
    if(error) {
        NSLog(@%@, [error localizedDescription]);
    }
     
    [_tvChat setText:[_tvChat.text stringByAppendingString:[NSString stringWithFormat:@Iwrote:
%@
 
, _txtMessage.text]]];
    [_txtMessage setText:@];
    [_txtMessage resignFirstResponder];
}

发送消息时有个选项：MCSessionSendDataReliable，MCSessionSendDataUnreliable 但是不管是可靠还是不可靠，数据都是基于 UDP 进行传输的。
5、接收消息：

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-(void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID{
    NSDictionary *dict = @{@data: data,
                           @peerID: peerID
                           };
     
    [[NSNotificationCenter defaultCenter] postNotificationName:@MCDidReceiveDataNotification
                                                        object:nil
                                                      userInfo:dict];
}

消息的接收是通过 MCSession 的回调方法进行的。 MCSession的回调方法非常重要，设备状态的改变、消息的接收、资源的接收、流的接收都是通过这个回调进行通知的。

6、发送资源，资源可以是本地的URL，也可以是 Http 链接：

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-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    if(buttonIndex != [[_appDelegate.mcManager.session connectedPeers] count]) {
        NSString *filePath = [_documentsDirectory stringByAppendingPathComponent:_selectedFile];
        NSString *modifiedName = [NSString stringWithFormat:@%@_%@, _appDelegate.mcManager.peerID.displayName, _selectedFile];
        NSURL *resourceURL = [NSURL fileURLWithPath:filePath];
         
        dispatch_async(dispatch_get_main_queue(), ^{
            NSProgress *progress = [_appDelegate.mcManager.session sendResourceAtURL:resourceURL
                                                                            withName:modifiedName
                                                                              toPeer:[[_appDelegate.mcManager.session connectedPeers] objectAtIndex:buttonIndex]
                                                               withCompletionHandler:^(NSError *error) {
                                                                   if(error) {
                                                                       NSLog(@Error: %@, [error localizedDescription]);
                                                                   }
                                                                    
                                                                   else{
                                                                       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@MCDemo
                                                                                                                       message:@Filewas successfully sent.
                                                                                                                      delegate:self
                                                                                                             cancelButtonTitle:nil
                                                                                                             otherButtonTitles:@Great!, nil];
                                                                        
                                                                       [alert performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:NO];
                                                                        
                                                                       [_arrFiles replaceObjectAtIndex:_selectedRow withObject:_selectedFile];
                                                                       [_tblFiles performSelectorOnMainThread:@selector(reloadData)
                                                                                                   withObject:nil
                                                                                                waitUntilDone:NO];
                                                                   }
                                                               }];
             
            //NSLog(@*** %f, progress.fractionCompleted);
             
            [progress addObserver:self
                       forKeyPath:@fractionCompleted
                          options:NSKeyValueObservingOptionNew
                          context:nil];
        });
    }
}

可以通过 NSProgress查询相关状态。
7、接收资源：

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-(void)session:(MCSession *)session didStartReceivingResourceWithName:(NSString *)resourceName fromPeer:(MCPeerID *)peerID withProgress:(NSProgress *)progress{
     
    NSDictionary *dict = @{@resourceName :   resourceName,
                           @peerID       :   peerID,
                           @progress     :   progress
                           };
     
    [[NSNotificationCenter defaultCenter] postNotificationName:@MCDidStartReceivingResourceNotification
                                                        object:nil
                                                      userInfo:dict];
     
     
    dispatch_async(dispatch_get_main_queue(), ^{
        [progress addObserver:self
                   forKeyPath:@fractionCompleted
                      options:NSKeyValueObservingOptionNew
                      context:nil];
    });
}

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