Question

我的情况很简单：我需要发出警告信号，并希望确保用户听到它，所以我想查看系统音量。

如何找出当前系统的容量？

Answer 1

音频会话可以提供输出音量（iOS＆gt; = 6.0）。

float vol = [[AVAudioSession sharedInstance] outputVolume];
NSLog(@"output volume: %1.2f dB", 20.f*log10f(vol+FLT_MIN));

Answer 2

试试这个：

    MPMusicPlayerController *iPod = [MPMusicPlayerController iPodMusicPlayer];
    float volumeLevel = iPod.volume;

您需要导入MediaPlayer框架。

Answer 3

这很好用：

Float32 volume;
UInt32 dataSize = sizeof(Float32);

AudioSessionGetProperty (
                     kAudioSessionProperty_CurrentHardwareOutputVolume,
                     &dataSize,
                     &volume
                     );

Answer 4

Swift 2 ：

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

Answer 5

您可以使用默认系统的卷查看并添加到您需要的任何位置。在我的情况下，我需要在我自己的音乐播放器中。这很简单，无忧无虑。只需添加视图，一切都完成了。这在Apple的MPVolume Class Reference中有解释。

mpVolumeViewParentView.backgroundColor = [UIColor clearColor];
MPVolumeView *myVolumeView =
[[MPVolumeView alloc] initWithFrame: mpVolumeViewParentView.bounds];
[mpVolumeViewParentView addSubview: myVolumeView];
[myVolumeView release];

Answer 6

我已经准备了一个静态方法的类来处理ios设备的数量。让我与您分享:)）

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 7

Swift 2.2，确保导入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

获取系统卷iOS

7 个答案: