前言
很多时候我们需要播放音频来提醒用户，调用系统铃声是不错的选择，例如自定义一个截图操作，可以调用系统的快门声；做一个VoIP通话服务，可以循环播放一段自定义铃声和震动，然后接通或者挂断时候手动停止，等等
下文所有的功能均使用系统框架AudioToolbox
播放系统铃声
func AudioServicesPlaySystemSound(_ inSystemSoundID: SystemSoundID)
使用AudioServicesPlaySystemSound方法，参数是你要播放的SoundID，然后系统会播放这个铃声一次，不会循环播放，系统的soundid表见下表
Sound ID
File name (iPhone)
File name (iPod Touch)
Category
Note
1000
new-mail.caf
new-mail.caf
MailReceived
1001
mail-sent.caf
mail-sent.caf
MailSent
1002
Voicemail.caf
Voicemail.caf
VoicemailReceived
1003
ReceivedMessage.caf
ReceivedMessage.caf
SMSReceived
1004
SentMessage.caf
SentMessage.caf
SMSSent
1005
alarm.caf
sq_alarm.caf
CalendarAlert
1006
low_power.caf
low_power.caf
LowPower
1007
sms-received1.caf
sms-received1.caf
SMSReceived_Alert
1008
sms-received2.caf
sms-received2.caf
SMSReceived_Alert
1009
sms-received3.caf
sms-received3.caf
SMSReceived_Alert
1010
sms-received4.caf
sms-received4.caf
SMSReceived_Alert
1011
-
-
SMSReceived_Vibrate
1012
sms-received1.caf
sms-received1.caf
SMSReceived_Alert
1013
sms-received5.caf
sms-received5.caf
SMSReceived_Alert
1014
sms-received6.caf
sms-received6.caf
SMSReceived_Alert
1015
Voicemail.caf
Voicemail.caf
-
Available since 2.1
1016
tweet_sent.caf
tweet_sent.caf
SMSSent
Available since 5.0
1020
Anticipate.caf
Anticipate.caf
SMSReceived_Alert
Available since 4.2
1021
Bloom.caf
Bloom.caf
SMSReceived_Alert
Available since 4.2
1022
Calypso.caf
Calypso.caf
SMSReceived_Alert
Available since 4.2
1023
Choo_Choo.caf
Choo_Choo.caf
SMSReceived_Alert
Available since 4.2
1024
Descent.caf
Descent.caf
SMSReceived_Alert
Available since 4.2
1025
Fanfare.caf
Fanfare.caf
SMSReceived_Alert
Available since 4.2
1026
Ladder.caf
Ladder.caf
SMSReceived_Alert
Available since 4.2
1027
Minuet.caf
Minuet.caf
SMSReceived_Alert
Available since 4.2
1028
News_Flash.caf
News_Flash.caf
SMSReceived_Alert
Available since 4.2
1029
Noir.caf
Noir.caf
SMSReceived_Alert
Available since 4.2
1030
Sherwood_Forest.caf
Sherwood_Forest.caf
SMSReceived_Alert
Available since 4.2
1031
Spell.caf
Spell.caf
SMSReceived_Alert
Available since 4.2
1032
Suspense.caf
Suspense.caf
SMSReceived_Alert
Available since 4.2
1033
Telegraph.caf
Telegraph.caf
SMSReceived_Alert
Available since 4.2
1034
Tiptoes.caf
Tiptoes.caf
SMSReceived_Alert
Available since 4.2
1035
Typewriters.caf
Typewriters.caf
SMSReceived_Alert
Available since 4.2
1036
Update.caf
Update.caf
SMSReceived_Alert
Available since 4.2
1050
ussd.caf
ussd.caf
USSDAlert
1051
SIMToolkitCallDropped.caf
SIMToolkitCallDropped.caf
SIMToolkitTone
1052
SIMToolkitGeneralBeep.caf
SIMToolkitGeneralBeep.caf
SIMToolkitTone
1053
SIMToolkitNegativeACK.caf
SIMToolkitNegativeACK.caf
SIMToolkitTone
1054
SIMToolkitPositiveACK.caf
SIMToolkitPositiveACK.caf
SIMToolkitTone
1055
SIMToolkitSMS.caf
SIMToolkitSMS.caf
SIMToolkitTone
1057
Tink.caf
Tink.caf
PINKeyPressed
1070
ct-busy.caf
ct-busy.caf
AudioToneBusy
There was no category for this sound before 4.0.
1071
ct-congestion.caf
ct-congestion.caf
AudioToneCongestion
There was no category for this sound before 4.0.
1072
ct-path-ack.caf
ct-path-ack.caf
AudioTonePathAcknowledge
There was no category for this sound before 4.0.
1073
ct-error.caf
ct-error.caf
AudioToneError
There was no category for this sound before 4.0.
1074
ct-call-waiting.caf
ct-call-waiting.caf
AudioToneCallWaiting
There was no category for this sound before 4.0.
1075
ct-keytone2.caf
ct-keytone2.caf
AudioToneKey2
There was no category for this sound before 4.0.
1100
lock.caf
sq_lock.caf
ScreenLocked
1101
unlock.caf
sq_lock.caf
ScreenUnlocked
1102
-
-
FailedUnlock
1103
Tink.caf
sq_tock.caf
KeyPressed
1104
Tock.caf
sq_tock.caf
KeyPressed
1105
Tock.caf
sq_tock.caf
KeyPressed
1106
beep-beep.caf
sq_beep-beep.caf
ConnectedToPower
1107
RingerChanged.caf
RingerChanged.caf
RingerSwitchIndication
1108
photoShutter.caf
photoShutter.caf
CameraShutter
1109
shake.caf
shake.caf
ShakeToShuffle
Available since 3.0
1110
jbl_begin.caf
jbl_begin.caf
JBL_Begin
Available since 3.0
1111
jbl_confirm.caf
jbl_confirm.caf
JBL_Confirm
Available since 3.0
1112
jbl_cancel.caf
jbl_cancel.caf
JBL_Cancel
Available since 3.0
1113
begin_record.caf
begin_record.caf
BeginRecording
Available since 3.0
1114
end_record.caf
end_record.caf
EndRecording
Available since 3.0
1115
jbl_ambiguous.caf
jbl_ambiguous.caf
JBL_Ambiguous
Available since 3.0
1116
jbl_no_match.caf
jbl_no_match.caf
JBL_NoMatch
Available since 3.0
1117
begin_video_record.caf
begin_video_record.caf
BeginVideoRecording
Available since 3.0
1118
end_video_record.caf
end_video_record.caf
EndVideoRecording
Available since 3.0
1150
vc~invitation-accepted.caf
vc~invitation-accepted.caf
VCInvitationAccepted
Available since 4.0
1151
vc~ringing.caf
vc~ringing.caf
VCRinging
Available since 4.0
1152
vc~ended.caf
vc~ended.caf
VCEnded
Available since 4.0
1153
ct-call-waiting.caf
ct-call-waiting.caf
VCCallWaiting
Available since 4.1
1154
vc~ringing.caf
vc~ringing.caf
VCCallUpgrade
Available since 4.1
1200
dtmf-0.caf
dtmf-0.caf
TouchTone
1201
dtmf-1.caf
dtmf-1.caf
TouchTone
1202
dtmf-2.caf
dtmf-2.caf
TouchTone
1203
dtmf-3.caf
dtmf-3.caf
TouchTone
1204
dtmf-4.caf
dtmf-4.caf
TouchTone
1205
dtmf-5.caf
dtmf-5.caf
TouchTone
1206
dtmf-6.caf
dtmf-6.caf
TouchTone
1207
dtmf-7.caf
dtmf-7.caf
TouchTone
1208
dtmf-8.caf
dtmf-8.caf
TouchTone
1209
dtmf-9.caf
dtmf-9.caf
TouchTone
1210
dtmf-star.caf
dtmf-star.caf
TouchTone
1211
dtmf-pound.caf
dtmf-pound.caf
TouchTone
1254
long_low_short_high.caf
long_low_short_high.caf
Headset_StartCall
1255
short_double_high.caf
short_double_high.caf
Headset_Redial
1256
short_low_high.caf
short_low_high.caf
Headset_AnswerCall
1257
short_double_low.caf
short_double_low.caf
Headset_EndCall
1258
short_double_low.caf
short_double_low.caf
Headset_CallWaitingActions
1259
middle_9_short_double_low.caf
middle_9_short_double_low.caf
Headset_TransitionEnd
1300
Voicemail.caf
Voicemail.caf
SystemSoundPreview
1301
ReceivedMessage.caf
ReceivedMessage.caf
SystemSoundPreview
1302
new-mail.caf
new-mail.caf
SystemSoundPreview
1303
mail-sent.caf
mail-sent.caf
SystemSoundPreview
1304
alarm.caf
sq_alarm.caf
SystemSoundPreview
1305
lock.caf
sq_lock.caf
SystemSoundPreview
1306
Tock.caf
sq_tock.caf
KeyPressClickPreview
The category was SystemSoundPreview before 3.2.
1307
sms-received1.caf
sms-received1.caf
SMSReceived_Selection
1308
sms-received2.caf
sms-received2.caf
SMSReceived_Selection
1309
sms-received3.caf
sms-received3.caf
SMSReceived_Selection
1310
sms-received4.caf
sms-received4.caf
SMSReceived_Selection
1311
-
-
SMSReceived_Vibrate
1312
sms-received1.caf
sms-received1.caf
SMSReceived_Selection
1313
sms-received5.caf
sms-received5.caf
SMSReceived_Selection
1314
sms-received6.caf
sms-received6.caf
SMSReceived_Selection
1315
Voicemail.caf
Voicemail.caf
SystemSoundPreview
Available since 2.1
1320
Anticipate.caf
Anticipate.caf
SMSReceived_Selection
Available since 4.2
1321
Bloom.caf
Bloom.caf
SMSReceived_Selection
Available since 4.2
1322
Calypso.caf
Calypso.caf
SMSReceived_Selection
Available since 4.2
1323
Choo_Choo.caf
Choo_Choo.caf
SMSReceived_Selection
Available since 4.2
1324
Descent.caf
Descent.caf
SMSReceived_Selection
Available since 4.2
1325
Fanfare.caf
Fanfare.caf
SMSReceived_Selection
Available since 4.2
1326
Ladder.caf
Ladder.caf
SMSReceived_Selection
Available since 4.2
1327
Minuet.caf
Minuet.caf
SMSReceived_Selection
Available since 4.2
1328
News_Flash.caf
News_Flash.caf
SMSReceived_Selection
Available since 4.2
1329
Noir.caf
Noir.caf
SMSReceived_Selection
Available since 4.2
1330
Sherwood_Forest.caf
Sherwood_Forest.caf
SMSReceived_Selection
Available since 4.2
1331
Spell.caf
Spell.caf
SMSReceived_Selection
Available since 4.2
1332
Suspense.caf
Suspense.caf
SMSReceived_Selection
Available since 4.2
1333
Telegraph.caf
Telegraph.caf
SMSReceived_Selection
Available since 4.2
1334
Tiptoes.caf
Tiptoes.caf
SMSReceived_Selection
Available since 4.2
1335
Typewriters.caf
Typewriters.caf
SMSReceived_Selection
Available since 4.2
1336
Update.caf
Update.caf
SMSReceived_Selection
Available since 4.2
1350
-
-
RingerVibeChanged
1351
-
-
SilentVibeChanged
4095
-
-
Vibrate
There was no category for this sound before 2.2.In the SDK this is the constant kSystemSoundID_Vibrate
播放自定义铃声
首先把要播放的音频文件放到工程里，Bundle读取url之后，用AudioServicesCreateSystemSoundID方法获取我们这个音频注册之后的SystemSoundID，就可以用AudioServicesPlaySystemSound直接播放出来了，这里我们假定播放注册一个名为“sound.m4a”的音频文件
var soundId: SystemSoundID = SystemSoundID()
let path = Bundle.main.path(forResource: "sound", ofType: "m4a")
let url = URL.init(fileURLWithPath: path!)
AudioServicesCreateSystemSoundID(url as CFURL, &soundId)
AudioServicesPlaySystemSound(soundId)
循环播放
@available(iOS 2.0, *)
public func AudioServicesAddSystemSoundCompletion(_ inSystemSoundID: SystemSoundID, _ inRunLoop: CFRunLoop?, _ inRunLoopMode: CFString?, _ inCompletionRoutine: @escaping AudioToolbox.AudioServicesSystemSoundCompletionProc, _ inClientData: UnsafeMutableRawPointer?) -> OSStatus
使用AudioServicesAddSystemSoundCompletion方法，可以为一个SystemSoundID绑定一个播放完成之后的回调，我们可以在回调里继续播放这个SystemSoundID，播放后会继续回到回调，这样就做到了循环播放的效果，记住，这个方法是全局的，如果你为一个SystemSoundID绑定过回调之后，不取消的话，其他地方播放这个SystemSoundID也会进入回调，所以停止播放时记得用AudioServicesRemoveSystemSoundCompletion方法移除回调绑定。至于停止播放，使用AudioServicesDisposeSystemSoundID方法传入SystemSoundID就可以了。全部的示例代码看下面
var soundId: SystemSoundID?
//注册音频文件，获取SystemSoundID
func getSoundId() -> SystemSoundID {
var soundId: SystemSoundID = SystemSoundID()
let path = Bundle.main.path(forResource: "sound", ofType: "m4a")
let url = URL.init(fileURLWithPath: path!)
AudioServicesCreateSystemSoundID(url as CFURL, &soundId)
return soundId
}
//播放自定义铃声和震动
func playAlertSound() {
if soundId == nil {
soundId = self.getSoundId()
}
AudioServicesAddSystemSoundCompletion(soundId!, nil, nil, { (SystemSoundID, pointer: UnsafeMutableRawPointer?) in
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate)
AudioServicesPlaySystemSound(SystemSoundID)
}, nil)
//kSystemSoundID_Vibrate是震动的id
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate)
AudioServicesPlaySystemSound(soundId!)
}
//停止播放
func stopAlertSoundWithSoundID() {
if soundId != nil {
AudioServicesDisposeSystemSoundID(soundId!)
AudioServicesRemoveSystemSoundCompletion(soundId!)
soundId = nil
}
AudioServicesDisposeSystemSoundID(kSystemSoundID_Vibrate)
}
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