iOS耳机等音频输出设备切换的通知

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleAudioSessionRouteChangeNoti:) name:AVAudioSessionRouteChangeNotification object:[AVAudioSession sharedInstance]];

}

//音频播放中断的通知

-(void)handleAudioSessionRouteChangeNoti:(NSNotification*)noti

{

    NSDictionary *userInfo = noti.userInfo;

    AVAudioSessionRouteChangeReason reason = [userInfo[AVAudioSessionRouteChangeReasonKey] unsignedIntegerValue];

    if (reason == AVAudioSessionRouteChangeReasonOldDeviceUnavailable)

    {

        AVAudioSessionRouteDescription *previousRoute = userInfo[AVAudioSessionRouteChangePreviousRouteKey];

        AVAudioSessionPortDescription *previousOutput = previousRoute.outputs[];

        NSString *portType = previousOutput.portType;

        if ([portType isEqualToString:AVAudioSessionPortHeadphones])

        {

            //原来使用的设备是耳机，现在不再使用耳机需要进行的操作

        }

    }

}