iOS - 系统提醒短音频

iPhone端系统Audio资源路径：

/System/Library/Audio/UISounds

首先，通过 NSFileManager 获取资源路径下的所有路径（文件夹／文件）

NSFileManager * fileManager = [NSFileManager defaultManager];
NSURL * _soundDataURL = [NSURL URLWithString:@"/System/Library/Audio/UISounds"];
NSDirectoryEnumerator * _soundDirectoryEnum = [fileManager enumeratorAtURL:_soundDataURL
includingPropertiesForKeys:@[NSURLIsDirectoryKey]
options:0
errorHandler:^BOOL(NSURL * _Nonnull url, NSError * _Nonnull error) {
return YES;
}];

接着遍历枚举，然后获取系统音频的SoundID：

/*!
@typedef        SystemSoundID
@abstract       SystemSoundIDs are created by the System Sound client application
for playback of a provided AudioFile.
*/
typedef UInt32      SystemSoundID;

通过使用 AudioServicesCreateSystemSoundID 方法：

/*!
@function       AudioServicesCreateSystemSoundID
@abstract       Allows the application to designate an audio file for playback by the System Sound server.
@discussion     SystemSoundIDs are used passed to
AudioServicesPlayAlertSound() & AudioServicesPlaySystemSound(),
designating the audio data to be played by the System Sound server.
@param          inFileURL
A CFURLRef for an AudioFile.
@param          outSystemSoundID
Returns a SystemSoundID.
*/
extern OSStatus
AudioServicesCreateSystemSoundID(   CFURLRef                    inFileURL,
SystemSoundID*              outSystemSoundID)

获取SoundID后，最后，使用 AudioServicesPlaySystemSound 播放这个SoundID 音频：

AudioServicesPlaySystemSound(SystemSoundID inSystemSoundID)