[Interest] iOS device volume control on iOS 12+ with Qt

[Jason H]

Eh, I think my code works, if I select the speaker. I thought I was getting partial volume but i think I was getting full volume from the ear speaker.  Curious to note: there is no way in Qt to do this, have to drop into AVFoundation to do that.
One of the many missing mobile features...

> Sent: Wednesday, October 16, 2019 at 3:43 PM
> From: "Jason H" <jhihn at gmx.com>
> To: "interestqt-project.org" <interest at qt-project.org>
> Subject: [Interest] iOS device volume control on iOS 12+ with Qt
>
> This solution had been working for me:
> https://stackoverflow.com/questions/50737943/how-to-change-volume-programmatically-on-ios-11-4/50740074#50740074
>
> But it seems that I can't get away with an MPVolumeView anymore. However the proposed solution isn't working for me as I am not sure how to patch that into a Qt iOS app.
> [UIApplication sharedApplication].windows is an array, but I am not sure what dragons are there with Qt.
>
> Anyway, even patching in [UIApplication sharedApplication].windows[0] doesn't seem to be working.
> I don't care about hiding the MPVolumeView. I just need it to work
>
> void setVolume(double volume){
> 	UIWindow *mainWindow = [UIApplication sharedApplication].windows[0];
> 	//UIView *mainWindow = [UIView new];
> 	MPVolumeView *volumeView = [MPVolumeView new];
> 	UISlider *volumeViewSlider = nil;
> 	[mainWindow addSubview:volumeView];
>
> 	for (UIView *view in volumeView.subviews) {
> 	  if ([view isKindOfClass:[UISlider class]]) {
> 		volumeViewSlider = (UISlider *)view;
> 		break;
> 	  }
> 	}
> 	if (volumeViewSlider != nil) {
> 		dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
> 			volumeViewSlider.value = volume;
> 			NSLog(@"volumeViewSlider  set to %1.3f", volume);
> 		});
> 	} else {
> 		NSLog(@"volumeViewSlider is nil");
> 	}
> }
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