iOS 設(shè)備與外部配件(Lightning)通訊

前一段時間,做了給lightning耳機升級的軟件,現(xiàn)在抽空將其記錄下來。
因為該軟件涉及到MFI認(rèn)證,所以需要External Accessory Framework框架。External Accessory Framework提供了配件連接iOS設(shè)備的通道。開發(fā)者可以通過它來開發(fā)連接配件的app。

下面就開始簡單了解下External Accessory Framework都有些什么吧:

  1. 它包含三個類:
    EAAccessory:代表了一個單例的硬件配件對象。
    EAAccessoryManager: 管理所有連接到iPhone的配件。
    EASession:定義了iPhone app與外部配件的連接和通道。

  2. EAAccessory類
    EAAccessory類的屬性:
    1 )配件是否連接iPhone的標(biāo)志
    @property(nonatomic, readonly, getter=isConnected) BOOL connected
    2 )連接設(shè)備的配件唯一標(biāo)識
    @property(nonatomic, readonly) NSUInteger connectionID
    3 )配件的制造商
    @property(nonatomic, readonly) NSString *manufacturer
    4 )配件名稱
    @property(nonatomic, readonly) NSString *name
    5 )配件型號
    @property(nonatomic, readonly) NSString *modelNumber
    6 )配件序列號
    @property(nonatomic, readonly) NSString *serialNumber
    7 )配件的固件版本號
    @property(nonatomic, readonly) NSString *firmwareRevision
    8 )配件的硬件版本號
    @property(nonatomic, readonly) NSString *hardwareRevision

  3. EAAccessoryManager
    //獲取配件的所有信息
    NSMutableArray *accessoryList = [[NSMutableArray alloc] initWithArray:[[EAAccessoryManager sharedAccessoryManager] connectedAccessories]];
    比如:獲取配件名稱
    NSString *name = [accessoryList[0] name];

  4. EASession
    // open a session with the accessory and set up the input and output stream on the default run loop
    - (BOOL)openSession
    {
    [_accessory setDelegate:self];
    _session = [[EASession alloc] initWithAccessory:_accessory forProtocol:_protocolString];

        if (_session)
        {
            [[_session inputStream] setDelegate:self];
            [[_session inputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
            [[_session inputStream] open];
    
            [[_session outputStream] setDelegate:self];
            [[_session outputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
            [[_session outputStream] open];
        }
        else
        {
            NSLog(@"creating session failed");
        }
    
        return (_session != nil);
    }
    

// close the session with the accessory.
- (void)closeSession
{
[[_session inputStream] close];
[[_session inputStream] removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[[_session inputStream] setDelegate:nil];
[[_session outputStream] close];
[[_session outputStream] removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[[_session outputStream] setDelegate:nil];

        [_session release];
        _session = nil;

        [_writeData release];
        _writeData = nil;
        [_readData release];
        _readData = nil;
    }

// asynchronous NSStream handleEvent method
- (void)stream:(NSStream *)aStream handleEvent: (NSStreamEvent)eventCode
{
switch (eventCode) {
case NSStreamEventNone:
break;
case NSStreamEventOpenCompleted:
break;
case NSStreamEventHasBytesAvailable:
//TTSLOG(@"-----處理接收過來的數(shù)據(jù)包------");
[self _readData];
break;
case NSStreamEventHasSpaceAvailable:
[self _writeData];
break;
case NSStreamEventErrorOccurred:
//TTSLOG(@"----error-----");
break;
case NSStreamEventEndEncountered:
//TTSLOG(@"------end---------");
break;
default:
break;
}
}

  1. 項目過程
    1 )導(dǎo)入External Accessory Framework框架
    2 )在info.plist里面添加協(xié)議,Supported external accessory protocols,協(xié)議名根廠家協(xié)商,例如:com.xxx.protocol
    3 ) 設(shè)置連接和斷開連接通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_accessoryDidConnect:) name:EAAccessoryDidConnectNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_accessoryDidDisconnect:) name:EAAccessoryDidDisconnectNotification object:nil];
    
    [[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications];
    
    - (void)_accessoryDidConnect:(NSNotification *)notification {
    }
    
    - (void)_accessoryDidDisconnect:(NSNotification *)notification {
    }
    

4 ) 配件連接成功后獲取配件對應(yīng)的協(xié)議,創(chuàng)建一個accessory controller對象。
//注意:_selectedAccessory和PROTOCOLSTRING2協(xié)議要對應(yīng),不然是不會成功的;。
EADSessionController *_eaSessionController = [EADSessionController sharedController];

   [_eaSessionController setupControllerForAccessory:_selectedAccessory
                                       withProtocolString:PROTOCOLSTRING2];

5 )打開session通訊
EADSessionController *sessionController = [EADSessionController sharedController];
_accessory = [sessionController accessory];
[sessionController openSession];
6 )最后就是向配件發(fā)送指令,相關(guān)指令就與硬件工程師協(xié)商。

對于External Accessory Framework框架就先了解到這里,如有不解或者錯誤的地方,歡迎指出。

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