檢測iOS中的靜音模式狀態

Question

我有一個應用程序使用AudioServicesPlaySystemSound（1104）方法在某些輕擊事件上播放聲音。它響應靜音模式與非靜音模式的狀態，並相應地靜音。

然而，AudioServicesPlaySystemSound（1150）處於什麼狀態振動開關是英寸

如何檢查的振動模式的狀態，這樣當用戶期望它，我可以沉默的聲音會不管玩？

謝謝

Answer 1

似乎有一個開源項目可以做到這一點。見here for the code and a sample project。 RBDMuteSwitch是這裏的關鍵課程。您可以使用它（作爲單身人士），並將您的班級設置爲RDBMuteSwitch的代表，以獲知有關交換機狀態的通知。您將收到開關變更的通知，或者您第一次撥打[[RBDMuteSwitch sharedInstance] detectMuteSwitch]。經過測試工作在iOS 9

這裏的RBDMuteSwitch.m的重要內容，以防GitHub的鏈接永遠不會消逝：

- (void)playbackComplete { 
    if ([(id)self.delegate respondsToSelector:@selector(isMuted:)]) { 
     // If playback is far less than 100ms then we know the device is muted 
     if (soundDuration < 0.010) { 
      [delegate isMuted:YES]; 
     } 
     else { 
      [delegate isMuted:NO]; 
     } 
    } 
    [playbackTimer invalidate]; 
} 

static void soundCompletionCallback (SystemSoundID mySSID, void* myself) { 
    AudioServicesRemoveSystemSoundCompletion (mySSID); 
    [[RBDMuteSwitch sharedInstance] playbackComplete]; 
} 

- (void)incrementTimer { 
    soundDuration = soundDuration + 0.001; 
} 

- (void)detectMuteSwitch { 
#if TARGET_IPHONE_SIMULATOR 
    // The simulator doesn't support detection and can cause a crash so always return muted 
    if ([(id)self.delegate respondsToSelector:@selector(isMuted:)]) { 
     [self.delegate isMuted:YES]; 
    } 
    return; 
#endif 

#if __IPHONE_5_0 <= __IPHONE_OS_VERSION_MAX_ALLOWED 
    // iOS 5+ doesn't allow mute switch detection using state length detection 
    // So we need to play a blank 100ms file and detect the playback length 
    soundDuration = 0.0; 
    CFURLRef  soundFileURLRef; 
    SystemSoundID soundFileObject; 

    // Get the main bundle for the app 
    CFBundleRef mainBundle = CFBundleGetMainBundle(); 

    // Get the URL to the sound file to play 
    soundFileURLRef = CFBundleCopyResourceURL(mainBundle, 
               CFSTR ("detection"), 
               CFSTR ("aiff"), 
               NULL); 

    // Create a system sound object representing the sound file 
    AudioServicesCreateSystemSoundID (soundFileURLRef, 
             &soundFileObject); 

    AudioServicesAddSystemSoundCompletion (soundFileObject,NULL,NULL, 
              soundCompletionCallback, 
              (void*) self); 

    // Start the playback timer 
    playbackTimer = [NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(incrementTimer) userInfo:nil repeats:YES]; 
    // Play the sound 
    AudioServicesPlaySystemSound(soundFileObject); 
    return; 
#else 
    // This method doesn't work under iOS 5+ 
    CFStringRef state; 
    UInt32 propertySize = sizeof(CFStringRef); 
    AudioSessionInitialize(NULL, NULL, NULL, NULL); 
    AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state); 
    if(CFStringGetLength(state) > 0) { 
     if ([(id)self.delegate respondsToSelector:@selector(isMuted:)]) { 
      [self.delegate isMuted:NO]; 
     } 
    } 
    if ([(id)self.delegate respondsToSelector:@selector(isMuted:)]) { 
     [self.delegate isMuted:YES]; 
    } 
    return; 
#endif 
} 

從本質上講，該代碼確實是一種無聲的聲音片段通話AudioServicesPlaySystemSound()已知的持續時間，並測試玩多久。如果播放持續時間少於預期時間，則表示靜音開關已打開。