將外部附件連接到3.5毫米耳機插孔時無法獲得通知

Question

我一直試圖讓它在現在工作一段時間。 我已經完成了他們在文檔中所說的一切，但仍然沒有任何東西。

這是我的應用程序委託，它註冊爲本地通知代碼：

- (void) registerForLocalNotifications { 
[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(_accessoryConnected:) 
              name:EAAccessoryDidConnectNotification 
              object:nil]; 


[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(_accessoryDisconnected:) 
              name:EAAccessoryDidDisconnectNotification 
              object:nil]; 

[[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications]; } 

以上摘自的applicationDidFinishLaunching調用。

這裏的連接/斷開方法的代碼：

- (void) _accessoryConnected:(NSNotification *)notification { 
      NSLog(@"_accessoryConnected"); } 

- (void) _accessoryDisconnected:(NSNotification*)notification { 
NSLog(@"_accessoryDisconnected"); } 


-(void) accessoryDidDisconnect:(EAAccessory *) accessory { 
NSLog(@"accessoryDidDisconnect"); } 

試圖連接來與iPhone和一無所獲，同爲我的外部附件我要與應用程序整合的耳機。

請幫忙， 謝謝， Shaul。

Answer 1

您應該爲此使用AudioSessionPropertyListener。 EAAccessory通知用於連接到30引腳端口的硬件。 在viewDidLoad中在ViewDidUnLoad

AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, audioSessionPropertyListener, nil); 

添加此偵聽並刪除它添加在視圖控制器使用下列方法。

BOOL isHeadsetPluggedIn() { 
    UInt32 routeSize = sizeof (CFStringRef); 
    CFStringRef route; 

    OSStatus error = AudioSessionGetProperty (kAudioSessionProperty_AudioRoute, 
               &routeSize, 
               &route 
              );  
    NSLog(@"%@", route); 
    return (!error && (route != NULL) && ([(NSString*)route rangeOfString:@"Head"].location != NSNotFound)); 
} 

void audioSessionPropertyListener(void* inClientData, AudioSessionPropertyID inID, 
            UInt32 inDataSize, const void* inData) { 
    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; 

    // Determines the reason for the route change, to ensure that it is not 
    //  because of a category change. 
    CFDictionaryRef routeChangeDictionary = inData;  
    CFNumberRef routeChangeReasonRef = CFDictionaryGetValue (routeChangeDictionary,CFSTR (kAudioSession_AudioRouteChangeKey_Reason)); 

    SInt32 routeChangeReason;  
    CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason); 

    // "Old device unavailable" indicates that a headset was unplugged, or that the 
    // device was removed from a dock connector that supports audio output. 
    if (routeChangeReason != kAudioSessionRouteChangeReason_OldDeviceUnavailable) 
     return; 

    if (!isHeadsetPluggedIn()) 
    { 
     AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride); 
    } 
    else 
    { 
     UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; 
     AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride); 
    }  
} 

請注意，我很久以前從某處獲得此代碼，並且它對我有用。現在不能歸因於我的來源，因爲我不知道我從哪裏得到它。