TA貢獻1860條經(jīng)驗 獲得超8個贊
JPM。實際上，你提供的鏈接會得到正確的答案（最終。;）為了完整性（因為SO應該是QUICK答案的來源?。?.....
// "Ambient" makes it respect the mute switch// Must call this once to init sessionif (!gAudioSessionInited){
AudioSessionInterruptionListener inInterruptionListener = NULL;
OSStatus error;
if ((error = AudioSessionInitialize (NULL, NULL, inInterruptionListener, NULL)))
{
NSLog(@"*** Error *** error in AudioSessionInitialize: %d.", error);
}
else
{
gAudioSessionInited = YES;
}}SInt32 ambient = kAudioSessionCategory_AmbientSound;if (AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (ambient), &ambient)){
NSLog(@"*** Error *** could not set Session property to ambient.");}
TA貢獻1827條經(jīng)驗 獲得超4個贊
-(BOOL)silenced {
#if TARGET_IPHONE_SIMULATOR
// return NO in simulator. Code causes crashes for some reason.
return NO;
#endif
CFStringRef state;
UInt32 propertySize = sizeof(CFStringRef);
AudioSessionInitialize(NULL, NULL, NULL, NULL);
AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state);
if(CFStringGetLength(state) > 0)
return NO;
else
return YES;
}
TA貢獻1784條經(jīng)驗 獲得超7個贊
如果您不在靜音模式下，其他答案中的某些代碼（包括接受的答案）可能不起作用，其中靜音開關受到尊重。
我編寫了下面的例程切換到環(huán)境，讀取開關，然后返回到我的應用程序中需要的設置。
-(BOOL)muteSwitchEnabled {
#if TARGET_IPHONE_SIMULATOR
// set to NO in simulator. Code causes crashes for some reason.
return NO;
#endif
// go back to Ambient to detect the switch
AVAudioSession* sharedSession = [AVAudioSession sharedInstance];
[sharedSession setCategory:AVAudioSessionCategoryAmbient error:nil];
CFStringRef state;
UInt32 propertySize = sizeof(CFStringRef);
AudioSessionInitialize(NULL, NULL, NULL, NULL);
AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state);
BOOL muteSwitch = (CFStringGetLength(state) <= 0);
NSLog(@"Mute switch: %d",muteSwitch);
// code below here is just restoring my own audio state, YMMV
_hasMicrophone = [sharedSession inputIsAvailable];
NSError* setCategoryError = nil;
if (_hasMicrophone) {
[sharedSession setCategory: AVAudioSessionCategoryPlayAndRecord error: &setCategoryError];
// By default PlayAndRecord plays out over the internal speaker. We want the external speakers, thanks.
UInt32 ASRoute = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,
sizeof (ASRoute),
&ASRoute
);
}
else
// Devices with no mike don't support PlayAndRecord - we don't get playback, so use just playback as we don't have a microphone anyway
[sharedSession setCategory: AVAudioSessionCategoryPlayback error: &setCategoryError];
if (setCategoryError)
NSLog(@"Error setting audio category! %@", setCategoryError);
return muteSwitch;
}
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