I have to say I did a lot of head banging over this.
It appears that iPhones have 2 sets of audio, each with their own volume:
http://artoftheiphone.com/2012/02/1...ume-controls-for-ringtones-and-general-audio/
The following code snippet allows you to control the general audio volume and includes some Objective C:
A few notes:
Any and all comments welcome...
It appears that iPhones have 2 sets of audio, each with their own volume:
- "General audio" - music, TTS etc
- "Ringer" or "ringtones/alerts" - incoming phone call, SMS arrivals, other notifications AND pseudo camera shutter sound.
http://artoftheiphone.com/2012/02/1...ume-controls-for-ringtones-and-general-audio/
The following code snippet allows you to control the general audio volume and includes some Objective C:
- That originated with this post of Erel's:
- Was extensively modified by me, using bloody-minded determination and lots of googling as a substitute for any Objective C competence, I'm particularly indebted to:
- Required a final nudge by JanPRO:
- Allows you to change the general audio volume (0 = mute, 1= full).
- Theoretically(**) allows you to get the current general audio volume.
- Hides the stupid "general audio volume HUD" (the little grey square with a speaker icon in it) that would otherwise appear.
B4X:
'Code module
#Region Project Attributes
#ApplicationLabel: Control General Audio Volume
#Version: 1.0.0
'Orientation possible values: Portrait, LandscapeLeft, LandscapeRight and PortraitUpsideDown
#iPhoneOrientations: Portrait, LandscapeLeft, LandscapeRight
#iPadOrientations: Portrait, LandscapeLeft, LandscapeRight, PortraitUpsideDown
#Target: iPhone, iPad
#MinVersion: 7
#End Region
Sub Process_Globals
'These global variables will be declared once when the application starts.
'Public variables can be accessed from all modules.
Public App As Application
Public NavControl As NavigationController
Private Page1 As Page
Private xTTS As TTS
Private label1 As Label
Private volume_value As Float
End Sub
Private Sub Application_Start (Nav As NavigationController)
NavControl = Nav
Page1.Initialize("Page1")
Page1.Title = "Page 1"
Page1.RootPanel.Color = Colors.White
NavControl.ShowPage(Page1)
'Initialize TTS
xTTS.Initialize("")
Audiovolume_hide
End Sub
Private Sub Page1_Resize(Width As Int, Height As Int)
Page1.RootPanel.RemoveAllViews
label1.Initialize("")
Page1.RootPanel.AddView(label1, 0, 0, Page1.RootPanel.Width, Page1.RootPanel.Height)
label1.Multiline = True
label1.Text = "Tap screen to change volume" & CRLF & "Volume set at: " & volume_value & CRLF & "Volume reported: " & Audiovolume_get
End Sub
Private Sub Page1_Click
volume_value = volume_value - .25
If volume_value < 0 Then volume_value = 1
Audiovolume_set(volume_value)
label1.Text = "Tap screen to change volume" & CRLF & "Volume set at: " & volume_value & CRLF & "Volume reported: " & Audiovolume_get
'Speak away
xTTS.Stop
xTTS.Speak("testing testing 1 2 3 4 5 6 7 8 9 10", True)
End Sub
Private Sub Application_Background
End Sub
Sub Audiovolume_hide
Dim no As NativeObject = Me
no.RunMethod("audiovol_hide", Null)
End Sub
Sub Audiovolume_get As Float
Dim no As NativeObject = Me
Return no.RunMethod("audiovol_get", Null).AsNumber
End Sub
Sub Audiovolume_set(volumevalue As Float)
Dim no As NativeObject = Me
no.RunMethod("audiovol_set:", Array(volumevalue))
End Sub
#If OBJC
@import MediaPlayer;
- (void) audiovol_hide
{
//following hides "general audio volume HUD" - see:
//http://stackoverflow.com/questions/7430985/hide-grey-volume-overlay-when-using-mpvolumeview
MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:CGRectMake(-2000., -2000., 0.f, 0.f)];
NSArray *windows = [UIApplication sharedApplication].windows;
volumeView.alpha = 0.1f;
volumeView.userInteractionEnabled = NO;
if (windows.count > 0) {
[[windows objectAtIndex:0] addSubview:volumeView];
}
}
- (float) audiovol_get
{
MPVolumeView *volumeView = [[MPVolumeView alloc] init];
//find general audio volumeViewSlider
UISlider* volumeViewSlider = nil;
for (UIView *view in [volumeView subviews]){
if ([view.class.description isEqualToString:@"MPVolumeSlider"]){
volumeViewSlider = (UISlider*)view;
break;
}
}
// get general audio volume here:
static float volval = .123;
// if comment next line out then this method returns .123 - proving that next
// line actually always returns 0 (at least in iOS 9.3)
volval = [volumeViewSlider value];
return volval;
}
- (void) audiovol_set: (float) volval
{
MPVolumeView *volumeView = [[MPVolumeView alloc] init];
//find general audio volumeViewSlider
UISlider* volumeViewSlider = nil;
for (UIView *view in [volumeView subviews]){
if ([view.class.description isEqualToString:@"MPVolumeSlider"]){
volumeViewSlider = (UISlider*)view;
break;
}
}
// set general audio volume here:
[volumeViewSlider setValue:volval animated:YES];
[volumeViewSlider sendActionsForControlEvents:UIControlEventTouchUpInside];
}
#End If(1) Re getting the current general audio volume:
Above I say "Theoretically(**) ..." - if you look closely at the code at the bottom of the - (float) audiovol_get Objective C method you will see that I could only ever get a value of 0 returned.
I could only test on my iPhone 4s running iOS 9.3 and there are some google hits that suggest that [volumeViewSlider value] is broken in iOS 9, for example:
http://stackoverflow.com/questions/35214008/how-to-change-the-volume-in-ios9
I would be really interested to know if getting the current general audio volume with this snippet works in earlier iOS releases.
(2) This only gives control of general audio volume - for control of ringer volume look at the sister snippet here:I could only test on my iPhone 4s running iOS 9.3 and there are some google hits that suggest that [volumeViewSlider value] is broken in iOS 9, for example:
http://stackoverflow.com/questions/35214008/how-to-change-the-volume-in-ios9
I would be really interested to know if getting the current general audio volume with this snippet works in earlier iOS releases.
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