监听耳机状态－

• 这篇文章是对耳机状态的介绍
• 网上大多数的方法都是基于ios6 我写的则是比较新的版本
• 代码如下,有什么问题可以联系我

1. 创建单例和通知

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [[AVAudioSession sharedInstance] setActive:YES error:nil];//创建单例对象并且使其设置为活跃状态.

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioRouteChangeListenerCallback:)   name:AVAudioSessionRouteChangeNotification object:nil];//设置通知
}

2.通知方法的实现

- (void)audioRouteChangeListenerCallback:(NSNotification*)notification
{
    
    NSDictionary *interuptionDict = notification.userInfo;
    NSInteger routeChangeReason = [[interuptionDict valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
    switch (routeChangeReason) {
        case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
            NSLog(@"AVAudioSessionRouteChangeReasonNewDeviceAvailable");
            tipWithMessage(@"耳机插入");
            break;
        case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
            NSLog(@"AVAudioSessionRouteChangeReasonOldDeviceUnavailable");
            tipWithMessage(@"耳机拔出，停止播放操作");
            break;
        case AVAudioSessionRouteChangeReasonCategoryChange:
            // called at start - also when other audio wants to play
            tipWithMessage(@"AVAudioSessionRouteChangeReasonCategoryChange");
            break;
    }
}

3.移除通知和自定义提示窗口

-(void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

//自定提醒窗口
NS_INLINE void tipWithMessage(NSString *message){
    
    dispatch_async(dispatch_get_main_queue(), ^{
        
        UIAlertView *alerView = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil];
        
        [alerView show];
        
        [alerView performSelector:@selector(dismissWithClickedButtonIndex:animated:) withObject:@[@0, @1] afterDelay:0.9];
    });
}

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