objective c - iOS: Accessing device hardware audio volume control

Question

I have implemented this streamer(https://github.com/DigitalDJ/AudioStreamer) inside my app and it runs fantastic, however it doesn't have volume controls implemented, anyone have tips how to get started with volume slide or something?

I was looking trough some similar questions :

• iOS: Change Device Volume

• Accessing hardware infos on iOS devices

• iOS System Volume Control

Didn't find any of these useful to answer to my question, how to change volume(up/down) and of course hook it to some kind of control i.e. slider, any help is appreciated

Answer 1

make sure you add the MediaPlayer framework to your project

you have to define a view in your .h file to put the slider in in this case "viewVolume"

INFO: THIS WONT WORK IN A SIMULATOR ONLY ON A REAL DEVICE.

#import <MediaPlayer/MediaPlayer.h>

- (void)showTheVolumeSlider {

    MPVolumeView *volumeViewSlider = [[MPVolumeView alloc] initWithFrame:viewVolume.bounds] ;
    [viewVolume addSubview:volumeViewSlider];
    [volumeViewSlider sizeToFit];

}

this code is using ARC.

this code wil also work:

musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
    musicPlayer.volume = slider.value;

but if you want to use this you have to make an system that updates the slider as the volume of the device is adjusted from an other place

this wil work for updating the volume but i don't know if it's the best way

  timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(updateSound) userInfo:nil repeats:YES];

this to update the UISlider:

- (void)updateSound {

    musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
    slider.value = musicPlayer.volume;
    // value from 0.0 to 1.0

}