How to change volume programmatically on iOS 11.4

Question

Before, I was setting sound volume programmatically using this approach:

MPVolumeView *volumeView = [[MPVolumeView alloc] init];
UISlider *volumeViewSlider =         


        

Answer 1

Changing volumeViewSlider.value after a small delay resolves problem.

- (IBAction)increase:(id)sender {
  MPVolumeView *volumeView = [[MPVolumeView alloc] init];
  UISlider *volumeViewSlider = nil;

  for (UIView *view in volumeView.subviews) {
    if ([view isKindOfClass:[UISlider class]]) {
      volumeViewSlider = (UISlider *)view;
      break;
    }
  }

  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    volumeViewSlider.value = 0.5f;
  });
}

Swift version