iOS下微信語音播放之切換聽筒和揚聲器的方法解決方案

[[UIDevice currentDevice] setProximityMonitoringEnabled:YES]; //建議在播放之前設置yes，播放結束設置NO，這個功能是開啟紅外感應

//添加監聽
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(sensorStateChange:)
name:@"UIDeviceProximityStateDidChangeNotification"
object:nil];

//處理監聽觸發事件
-(void)sensorStateChange:(NSNotificationCenter *)notification;
{
//如果此時手機靠近面部放在耳朵旁，那么聲音將通過聽筒輸出，並將屏幕變暗（省電啊）
if ([[UIDevice currentDevice] proximityState] == YES)
{
NSLog(@"Device is close to user");
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

}
else
{
NSLog(@"Device is not close to user");
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
}
}


//初始化播放器的時候如下設置
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
sizeof(sessionCategory),
&sessionCategory);

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,
sizeof (audioRouteOverride),
&audioRouteOverride);

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
//默認情況下揚聲器播放
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[audioSession setActive:YES error:nil];