Get System Volume iOS - ios

Question

My case is simple:
I need to play a warning signal and want to make sure the user will hear it, so I want to check the system volume.
How can I find out what the current system volume is?

Answer 1

Update for Swift
let vol = AVAudioSession.sharedInstance().outputVolume
The audio session can provide output volume (iOS >= 6.0).
float vol = [[AVAudioSession sharedInstance] outputVolume];
NSLog(#"output volume: %1.2f dB", 20.f*log10f(vol+FLT_MIN));

Answer 2

Swift 3.1
let audioSession = AVAudioSession.sharedInstance()
var volume: Float?
do {
try audioSession.setActive(true)
volume = audioSession.outputVolume
} catch {
print("Error Setting Up Audio Session")
}
audioSession.setActive(true) - important

Answer 3

Try this:
MPMusicPlayerController *iPod = [MPMusicPlayerController iPodMusicPlayer];
float volumeLevel = iPod.volume;
You need to import the MediaPlayer framework.

Answer 4

This works fine:
Float32 volume;
UInt32 dataSize = sizeof(Float32);
AudioSessionGetProperty (
kAudioSessionProperty_CurrentHardwareOutputVolume,
&dataSize,
&volume
);

Answer 5

For Swift 2:
let volume = AVAudioSession.sharedInstance().outputVolume
print("Output volume: \(volume)")

Answer 6

You can use the default system's volume View and add to wherever you need it. In my case I required it in my own music player. It's easy and hassle free. Just add the view, and everything is done. This is explained in Apple's MPVolume Class Reference.
mpVolumeViewParentView.backgroundColor = [UIColor clearColor];
MPVolumeView *myVolumeView =
[[MPVolumeView alloc] initWithFrame: mpVolumeViewParentView.bounds];
[mpVolumeViewParentView addSubview: myVolumeView];
[myVolumeView release];

Answer 7

I have prepared a class with static methods in order to deal with the volume of ios devices. Let me share with you :)
import AVFoundation
class HeadPhoneDetectHelper {
class func isHeadPhoneConnected() -> Bool
{
do{
let audioSession = AVAudioSession.sharedInstance()
try audioSession.setActive(true)
let currentRoute = audioSession.currentRoute
let headPhonePortDescriptionArray = currentRoute.outputs.filter{$0.portType == AVAudioSessionPortHeadphones}
let isHeadPhoneConnected = headPhonePortDescriptionArray.count != 0
return isHeadPhoneConnected
}catch{
print("Error while checking head phone connection : \(error)")
}
return false
}
class func isVolumeLevelAppropriate() -> Bool
{
let minimumVolumeLevelToAccept = 100
let currentVolumeLevel = HeadPhoneDetectHelper.getVolumeLevelAsPercentage()
let isVolumeLevelAppropriate = currentVolumeLevel >= minimumVolumeLevelToAccept
return isVolumeLevelAppropriate
}
class func getVolumeLevelAsPercentage() -> Int
{
do{
let audioSession = AVAudioSession.sharedInstance()
try audioSession.setActive(true)
let audioVolume = audioSession.outputVolume
let audioVolumePercentage = audioVolume * 100
return Int(audioVolumePercentage)
}catch{
print("Error while getting volume level \(error)")
}
return 0
}
}

Answer 8

Swift 2.2, make sure to import MediaPlayer
private func setupVolumeListener()
{
let frameView:CGRect = CGRectMake(0, 0, 0, 0)
let volumeView = MPVolumeView(frame: frameView)
//self.window?.addSubview(volumeView) //use in app delegate
self.view.addSubview(volumeView) //use in a view controller
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(volumeChanged(_:)), name: "AVSystemController_SystemVolumeDidChangeNotification", object: nil)
}//eom
func volumeChanged(notification:NSNotification)
{
let volume = notification.userInfo!["AVSystemController_AudioVolumeNotificationParameter"]
let category = notification.userInfo!["AVSystemController_AudioCategoryNotificationParameter"]
let reason = notification.userInfo!["AVSystemController_AudioVolumeChangeReasonNotificationParameter"]
print("volume: \(volume!)")
print("category: \(category!)")
print("reason: \(reason!)")
print("\n")
}//eom