獲取系統音量iOS

Question

我的情況很簡單： 我需要播放警告信號，並且要確保用戶能夠聽到它，所以我想檢查系統音量。

我如何知道當前的系統卷是什麼？

Answer 1

音頻會話可以提供輸出音量（iOS> = 6.0）。

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

Answer 2

試試這個：

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

您需要導入MediaPlayer的框架。

Answer 3

這工作得很好：

Float32 volume; 
UInt32 dataSize = sizeof(Float32); 

AudioSessionGetProperty (
        kAudioSessionProperty_CurrentHardwareOutputVolume, 
        &dataSize, 
        &volume 
        ); 

Answer 4

您可以使用系統默認的音量查看和添加，無論你需要它。在我的情況下，我需要在我自己的音樂播放器中播放。這很容易，無憂無慮。只需添加視圖，一切都完成了。這在Apple的MPVolume Class Reference中有解釋。

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

Answer 5

我準備用靜態方法的類，以應付iOS設備的音量。我想與大家分享:)

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 6

對於斯威夫特2：

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

Answer 7

雨燕2.2，確保進口的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 

Answer 8

雨燕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) - 重要