Take picture with volume button

Question

I'm developing an app with some camera functionality and I'd like to use the volume buttons to take a picture (as the Apple Camera app does).

Using MPVolumeView and this snippet:

let rect = CGRect(x: -500, y: -500, width: 0, height: 0)
let volumeView = MPVolumeView(frame: rect)
UIApplication.sharedApplication().windows.first?.addSubview(volumeView)

and registering to AVSystemController_SystemVolumeDidChangeNotification notifications I'm able to intercept when the button is pressed and avoid showing the volume HUD.

This trick works unless the setting "Change with Buttons" in Settings > Sounds is on. In that case, I still get the notification, but the HUD will appear.

Any idea how to hide the HUD even when that setting is on?

score 0 · Accepted Answer · answered Oct 09 '15 at 13:06

0

I know for sure that the JPSVolumeButtonHandler available on GitHub can

Hide the HUD typically displayed on volume button presses.

I found that the workaround solution is here but it's similar to your solution:

- (void)disableVolumeHUD 
{
    self.volumeView = [[MPVolumeView alloc] initWithFrame:CGRectMake(MAXFLOAT, MAXFLOAT, 0, 0)];
    [[[[UIApplication sharedApplication] windows] firstObject] addSubview:self.volumeView];
}

I suggest to look at this repository, it's works very well and I suppose reading the description also when

the setting "Change with Buttons" in Settings > Sounds is on

answered Oct 09 '15 at 13:06

Massimo Polimeni

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Does it work even with the "Change with Buttons" setting on? I'll have a look at the repo later – Luca Torella Oct 09 '15 at 16:49
sorry I don't know more and now I can't try – Massimo Polimeni Oct 09 '15 at 22:02
Apparently if I use that class it works. I wonder what's the missing bit in my code. – Luca Torella Oct 12 '15 at 12:30
The three lines that you posted seems to be ok so you need to check the other lines in your code; maybe it's just a little mistake. – Massimo Polimeni Oct 12 '15 at 15:11

Take picture with volume button

1 Answers1