iOS开发实用技术之音频开发

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录制音频

创建一个录音对象

/** 录音对象 */@property (nonatomic, strong) AVAudioRecorder *recorder;

#pragma mark - 懒加载代码- (AVAudioRecorder *)recorder{    if (_recorder == nil) {        // 1.获取音频存放的路径        // 1.1.URL决定的录制的音频的存放的位置        NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];        // 1.2.拼接一个音频的文件名称        NSString *filePath = [path stringByAppendingPathComponent:@"123.caf"];        // 1.3.将路径转成URL        NSURL *url = [NSURL fileURLWithPath:filePath];        // 2.设置音频的相关格式:settings : 决定音频的格式/采样率        NSDictionary *setttings = @{                    AVFormatIDKey : @(kAudioFormatLinearPCM),                    AVSampleRateKey : @(8000)};        // 3.创建录音对象        self.recorder = [[AVAudioRecorder alloc] initWithURL:url settings:setttings error:nil];    }    return _recorder;}

播放音频基本使用

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    // 1.定义一个SystemSoundID    SystemSoundID soundID = 0;    // 2.根据音频文件资源创建SystemSoundID(赋值)    NSURL *url = [[NSBundle mainBundle] URLForResource:@"buyao.wav" withExtension:nil];    CFURLRef urlRef = (__bridge CFURLRef)(url);    AudioServicesCreateSystemSoundID(urlRef, &soundID);    // 3.播放音频    // 播放音效的同时有震动效果    AudioServicesPlayAlertSound(soundID);    // 仅仅是播放音效    // AudioServicesPlaySystemSound(soundID);}

播放音效工具类抽取

建一个静态变量保存声音（字典）

static NSMutableDictionary *_soundIDs;

第一使用初始化赋值

+ (void)initialize{_soundIDs = [NSMutableDictionary dictionary];}

+ (void)playSoundWithSoundName:(NSString *)soundName{// 1.从字典中取出之前保存的soundIDSystemSoundID soundID = [[_soundIDs objectForKey:soundName] unsignedIntValue];// 2.如果取出为0,表示之前没有加载当前声音if (soundID == 0) {    // 2.1.根据资源文件加载soundID    CFURLRef url = (__bridge CFURLRef)[[NSBundle mainBundle] URLForResource:soundName withExtension:nil];    AudioServicesCreateSystemSoundID(url, &soundID);    // 2.2.存入字典    [_soundIDs setObject:@(soundID) forKey:soundName];}// 3.播放声音AudioServicesPlaySystemSound(soundID);}

音乐播放

建一个播放器

 /** 播放器 */ @property (nonatomic, strong) AVAudioPlayer *player;

#pragma mark - 懒加载代码- (AVAudioPlayer *)player{    if (_player == nil) {        // 获取资源的URL        NSURL *url = [[NSBundle mainBundle] URLForResource:@"1201111234.mp3" withExtension:nil];        // 创建播放器        NSError *error = nil;        _player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];    }    return _player;}

建一个字典存储播放器

- (void)playMusicWithMusicName:(NSString *)musicName{    // 1.从字典中取出之前保存的播放器    AVAudioPlayer *player = self.players[musicName];    // 2.判断播放器是否为nil,如果为空,则创建播放器    if (player == nil) {        // 2.1.加载对应的资源        NSURL *url = [[NSBundle mainBundle] URLForResource:musicName withExtension:nil];        // 2.2.创建播放器        player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];        // 2.3.将播放器存入字典        [self.players setObject:player forKey:musicName];    }    // 3.播放音乐    [player play];}

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