ios7 adjusting iPodMusicPlayer volume

Question

I'm writing an app for ios7 that needs to control the volume of the built in music player or the master volume level in general. I've tried using the MediaPlayer.framework but not sure if that's right. I'm wondering what the best way to go about this is. Thanks!

Answer 1

According to Apple, in iOS7 setting MPMusicPlayerController's volume is deprecated:

// The current volume of playing music, in the range of 0.0 to 1.0.
// This property is deprecated -- use MPVolumeView for volume control instead.
@property(nonatomic) float volume NS_DEPRECATED_IOS(3_0, 7_0);

Apple recommends using MPVolumeView, so I came up with this:

Add volumeSlider property:

@property (nonatomic, strong) UISlider *volumeSlider;

Init MPVolumeView and add somewhere to your view (can be hidden, without frame, or empty because of showsRouteButton = NO and showsVolumeSlider = NO):

MPVolumeView *volumeView = [MPVolumeView new];
volumeView.showsRouteButton = NO;
volumeView.showsVolumeSlider = NO;
[self.view addSubview:volumeView];

Find and save reference to UISlider:

__weak __typeof(self)weakSelf = self;
[[volumeView subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    if ([obj isKindOfClass:[UISlider class]]) {
        __strong __typeof(weakSelf)strongSelf = weakSelf;
        strongSelf.volumeSlider = obj;
        *stop = YES;
    }
}];

Add target action for UIControlEventValueChanged:

[self.volumeSlider addTarget:self action:@selector(handleVolumeChanged:) forControlEvents:UIControlEventValueChanged];

And then detect volume changing (i.e. by the hardware volume controls):

- (void)handleVolumeChanged:(id)sender
{
    NSLog(@"%s - %f", __PRETTY_FUNCTION__, self.volumeSlider.value);
}

and also other way around, you can set volume by:

self.volumeSlider.value = < some value between 0.0f and 1.0f >;

Hope this helps (and that Apple doesn't remove MPVolumeSlider from MPVolumeView).

Answer 2

try this

[[MPMusicPlayerController applicationMusicPlayer] setVolume:(use a value between 0.0 and 1.0)]

try this if you want to provide volume control

 MPVolumeView *myVolumeView =
    [[MPVolumeView alloc] initWithFrame: CGRectMake(70, 300, 200, 40)];
    [myVolumeView setShowsVolumeSlider:YES];
    [myVolumeView setShowsRouteButton:YES];
    [myVolumeView sizeToFit];
    [myVolumeView setBackgroundColor:[UIColor cyanColor]];
    CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI * 0.5);
    myVolumeView.transform = trans;
    [moviePlayerContlr.view addSubview: myVolumeView];

ALTERNATE:

UISlider  * aSlider;
    aSlider = [[UISlider alloc] initWithFrame:CGRectMake(70, 200, 100, 40)];
    [aSlider setMaximumValue:0];
    [aSlider setMaximumValue:1];
    [aSlider addTarget:self action:@selector(aSliderAction:) forControlEvents:UIControlEventValueChanged];
    [moviePlayerContlr.view addSubview:aSlider];

    UIImage *stetchTrack = [[UIImage imageNamed:@"faderTrack.png"]
                            stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
    [aSlider setThumbImage: [UIImage imageNamed:@"faderKey.png"] forState:UIControlStateNormal];
    [aSlider setMinimumTrackImage:stetchTrack forState:UIControlStateNormal];
    [aSlider setMaximumTrackImage:stetchTrack forState:UIControlStateNormal];
    CGAffineTransform tran = CGAffineTransformMakeRotation(M_PI * -0.5);
    aSlider.transform = trans;



- (void)aSliderAction:(id)sender
{
    NSLog(@"%d",(int)[aSlider value]);;

[[MPMusicPlayerController applicationMusicPlayer] setVolume:aSlider.value];
}

Answer 3

Using iPodMusicPlayer would affect the actual iPod volume setting as well. If you want to avoid that, use this

#import <MediaPlayer/MediaPlayer.h>
// ...
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
musicPlayer.volume = slider.value; //float value for volume

Or Try with:

MPMusicPlayerController *musicPlayer = = [MPMusicPlayerController iPodMusicPlayer];
musicPlayer.volume = slider.value; //float value for volume