[[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:AVAudioSessionCategoryPlayAndRecord error:nil]; } else { NSLog(@"Device is not close to user"); [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error: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 = [AVAudioSession sharedInstance]; //默认情况下扬声器播放 [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil]; [audioSession setActive:YES error:nil];
To determine if proximity monitoring is available, attempt to enable it. If the value of the proximityState property remains NO, proximity monitoring is not available.
UIDeviceProximityStateDidChangeNotification，当近距离传感器状态改变时发生。
//添加近距离事件监听，添加前先设置为YES，如果设置完后还是NO的读话，说明当前设备没有近距离传感器
[[UIDevice currentDevice] setProximityMonitoringEnabled:YES];
if ([UIDevice currentDevice].proximityMonitoringEnabled == YES) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sensorStateChange:)name:UIDeviceProximityStateDidChangeNotification object:nil];
}
//删除近距离事件监听
[[UIDevice currentDevice] setProximityMonitoringEnabled:YES];
if ([UIDevice currentDevice].proximityMonitoringEnabled == YES) {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceProximityStateDidChangeNotification object:nil];
}
[[UIDevice currentDevice] setProximityMonitoringEnabled:NO];
#pragma mark - 处理近距离监听触发事件
-(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)//黑屏
{
NSLog(@"Device is close to user");
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
}
else//没黑屏幕
{
NSLog(@"Device is not close to user");
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
if (![MTool isPlayRecodering]) {//没有播放了，也没有在黑屏状态下，就可以把距离传感器关了
[[UIDevice currentDevice] setProximityMonitoringEnabled:NO];
}
}
}
UILongPressGestureRecognizer *longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self
action:@selector(longPressed:)];
[longPressGestureRecognizer setMinimumPressDuration:1.0f];
[longPressGestureRecognizer setAllowableMovement:50.0];
[self.bubbleBgImageView addGestureRecognizer:longPressGestureRecognizer];
[longPressGestureRecognizer release];
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-(void)longPressed:(UILongPressGestureRecognizer *) gestureRecognizer
{
switch (gestureRecognizer.state)
{
case UIGestureRecognizerStateEnded:
break;
case UIGestureRecognizerStateCancelled:
break;
case UIGestureRecognizerStateFailed:
break;
case UIGestureRecognizerStateBegan:
if ([self.voiceDelegate respondsToSelector:@selector(BaseChartVoiceLongPressed)])
{
[self.voiceDelegate BaseChartVoiceLongPressed];
}
break;
case UIGestureRecognizerStateChanged:
break;
default:
break;
}
}
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#pragma mark BaseChartCellDelegate
-(void)BaseChartVoiceLongPressed
{
NSLog(@"voice long Pressed");
if ([[[AVAudioSession sharedInstance] category] isEqualToString:AVAudioSessionCategoryPlayback])
{
//切换为听筒播放
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[self showTipInfo:@"切换为听筒模式"];
}
else
{
//切换为扬声器播放
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[self showTipInfo:@"切换为扬声器模式"];
}
}
原文：http://www.cnblogs.com/520gp-iOS/p/5264879.html