iOS音频——使用System Sound API

是C语言的低层次API，可以播放短的声音，不能暂停或停止等控制。

可以用来制作游戏音效和操作音，以及提醒用户要做某件事，还可以发出振动提醒，但是只能在iphone设备上。

播放系统声音

主要用于游戏音效和操作声音等。

#import "ViewController.h"

#import <AudioToolbox/AudioToolbox.h>

@interface ViewController ()

- (IBAction)playSystemSound:(id)sender;

@end

#pragma mark -定义一个回调函数，用于当声音播放完成之后回调

void SoundFinishedPlayingCallback(SystemSoundID sound_id, void * user_data)

{

    //注销声音播放完成事件回调函数

    AudioServicesRemoveSystemSoundCompletion(sound_id);

    //释放SystemSoundID

    AudioServicesDisposeSystemSoundID(sound_id);

}

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

}

- (IBAction)playSystemSound:(id)sender

{

    NSString *path = [[NSBundle mainBundle] pathForResource:@"AlertChordStroke" ofType:@"wav"];

    NSURL *system_sound_url = [NSURL fileURLWithPath:path];

    SystemSoundID system_sound_id;

    //创建SystemSoundID

    AudioServicesCreateSystemSoundID((__bridge CFURLRef)system_sound_url, &system_sound_id);

    //注销声音播放完成事件回调函数

    AudioServicesAddSystemSoundCompletion(system_sound_id, NULL, NULL, SoundFinishedPlayingCallback, NULL);

    //播放系统声音

    AudioServicesPlaySystemSound(system_sound_id);

}

@end

发出警告提醒

只在iphone下有振动。

- (IBAction)alertSound:(id)sender

{

    NSURL *system_sound_url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"AlertChordStroke" ofType:@"wav"]];

    SystemSoundID system_sound_id;

    AudioServicesCreateSystemSoundID((__bridge CFURLRef)system_sound_url, &system_sound_id);

    AudioServicesAddSystemSoundCompletion(system_sound_id, NULL, NULL, SoundFinishedPlayingCallback, NULL);

    AudioServicesPlayAlertSound(system_sound_id);

}

振动

- (IBAction)vibrate:(id)sender

{

    NSString *deviceModel = [[UIDevice currentDevice] model];

    if ([deviceModel isEqualToString:@"iPhone"])

    {

        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

    }

    else

    {

        UIAlertController *alertC = [[UIAlertController alloc] init];

        [alertC setTitle:@"提示"];

        UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"设备不支持" style:UIAlertActionStyleDefault handler:nil];

        [alertC addAction:alertAction];

        [self presentViewController:alertC animated:YES completion:nil];

    }

}