iOS 播放器静音设置方法

volumeFloat = [self getVolume];

-(float) getVolume
{
    //获取系统系统音量视图
    MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame: CGRectMake(-1000, -100, 100, 100)];
    volumeView.hidden = NO;//不显示系统音量调节视图
    [self addSubview:volumeView];
    volumeViewSlider = nil;
    for(UIView *view in [volumeView subviews])
    {
        if([[[view class] description] isEqualToString:@"MPVolumeSlider"])
        {
            volumeViewSlider=(UISlider *)view;
            break;
        }
    }
    float val = [volumeViewSlider value];
    return val;
}

//关闭系统音量(静音)
-(void)closeSysVolume
{
    [volumeViewSlider setValue:0 animated:NO];
}

-(void)reStartSysVolume
{
    NSLog(@"重启音量");

    if (volumeFloat == 0) {
        volumeFloat = 0.5;
    }
    [volumeViewSlider setValue:volumeFloat animated:NO];
    //注：设置恢复后不会影响系统音量图标的正常显示
    MPVolumeView *volumeView = [MPVolumeView new];
    volumeView.hidden = YES;
}

//关闭系统音量(静音)
-(void)closeSysVolume
{
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:nil];
}

-(void)reStartSysVolume
{
    NSLog(@"重启音量");
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:nil];
}