ios - AudioServicesPlaySystemSound sound volume dependency -

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i'm making ios keyboard extension.

to play click sound, used audioservicesplaysystemsound.

however users reported click sound depends on 'bell sound volume(bell icon)' , 'normal sound volume(speaker icon)'

i tested on apple memo app , found there cases inconstant dependency.

here code init

func inittypesound(soundindex: int) {     let bundle = nsbundle.mainbundle()     var = 0 ; < max_type_sound_count ; i++ {         if let url = bundle.urlforresource(nsstring(format: "type%d_%d", soundindex, i) string, withextension: "wav") {             // file exist             var soundid : systemsoundid = 0             audioservicescreatesystemsoundid(url, &soundid)             mtypesoundids.insert(soundid, atindex: i)         } else {             // no file         }     } }

and code play

func play(soundtype: kksoundtype) {     if (!mhaspermission || !missound) {         return     }      var session = avaudiosession.sharedinstance()     let systemvolumn = session.outputvolume     if (systemvolumn == 0) {         return     }      var soundid : systemsoundid!     switch (soundtype) {     case .type:         let rand = int(arc4random_uniform(uint32(mtypesoundids.count)));         soundid = mtypesoundids[rand];         break     case .space:         soundid = mspacesoundid;         break     default:         return     }     if missound {         audioservicesplaysystemsound(soundid)     } }


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