红外自动切换播放语音听筒
本文实现的功能描述:
在播放语音的时候,如果手机贴近耳朵,切换听筒播放,当离开耳朵附近时切换为扬声器播放;
具体如下:
- (void) openProximityMonitor {
[self closeProximityMonitor];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(sensorStateChange:) name:@"UIDeviceProximityStateDidChangeNotification"
object:nil];
[[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
}
- (void) closeProximityMonitor {
[[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIDeviceProximityStateDidChangeNotification" object:nil];
[[UIDevice currentDevice] setProximityMonitoringEnabled:NO];
//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
}
//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];
}
}