iOS下微信语音播放之切换听筒和扬声器的方法解决方案

[[UIDevice currentDevice] setProximityMonitoringEnabled:YES];//建议在播放之前设置yes，播放结束设置NO，这个功能是开启红外感应

//添加监听

[[NSNotificationCenter defaultCenter]addObserver:self

selector:@selector(sensorStateChange:)

name:@"UIDeviceProximityStateDidChangeNotification"

object:nil];

//处理监听触发事件

-(void)sensorStateChange:(NSNotificationCenter*)notification;

{

//如果此时手机靠近面部放在耳朵旁，那么声音将通过听筒输出，并将屏幕变暗（省电啊）

if ([[UIDevice currentDevice] proximityState] ==YES)

{

NSLog(@"Device is close to user");

[[AVAudioSession sharedInstance]setCategory:AVAudioSessionCategoryPlayAndRecorderror:nil];

}

else

{

NSLog(@"Device is not close to user");

[[AVAudioSession sharedInstance]setCategory:AVAudioSessionCategoryPlaybackerror:nil];

}

}

//初始化播放器的时候如下设置

UInt32 sessionCategory =kAudioSessionCategory_MediaPlayback;

AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,

sizeof(sessionCategory),

&sessionCategory);

UInt32 audioRouteOverride =kAudioSessionOverrideAudioRoute_Speaker;

AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute,

sizeof (audioRouteOverride),

&audioRouteOverride);

AVAudioSession *audioSession = [AVAudioSessionsharedInstance];

//默认情况下扬声器播放

[audioSession setCategory:AVAudioSessionCategoryPlaybackerror:nil];

[audioSession setActive:YES error:nil];