为此,您应该使用 AudioSessionPropertyListener。
EAAccessory 通知适用于连接到 30 针端口的硬件。
在 viewDidLoad 中添加此监听器并在 ViewDidUnLoad 中删除它
AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, audioSessionPropertyListener, nil);
在视图控制器中添加以下方法。
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);
}
}
请注意,我很久以前从某个地方得到了这段代码,它对我有用。现在无法确定来源,因为我不知道从哪里得到它。