iOS开发实用技术之音频开发

录制音频

/** 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);
}

static NSMutableDictionary *_soundIDs;

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

+ (void)playSoundWithSoundName:(NSString *)soundName
{
// 1.从字典中取出之前保存的soundID
SystemSoundID 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

/** 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;
}

- (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];
}