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我创建了简单的应用程序来流式传输音频。它与音量按钮完美配合。在后台模式下播放。但是当我切换“静音开关”时，音乐仍然播放。为什么？

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.player = [AVPlayer playerWithURL:[NSURL URLWithString:@"http://87.98.235.103:9768/"]];
}

- (void)viewDidUnload
{
    [self setPlayBtn:nil];
    [self setStopBtn:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}
- (IBAction)pressedPlay:(id)sender {

    [self.player play];

}

- (IBAction)pressedStop:(id)sender {

    [self.player pause];
}

在应用程序 didFinishLaunching 中：

NSError *sessionError = nil;
[[AVAudioSession sharedInstance] setDelegate:self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];

UInt32 doChangeDefaultRoute = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefaultRoute), &doChangeDefaultRoute);

在 plist 我有：

Required background modes: App plays audio
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