iOS开发中的录音机

首先一定记得权限

Privacy - Microphone Usage Description

然后先看一下界面

这是三个button

导入库AVFoundation

以及代码实现部分

#import <上述库的头文件>

# define COUNTDOWN 60

全局变量

{

NSTimer *_timer; //定时器

NSInteger countDown;  //倒计时

NSString *filePath;

}

第一个按钮方法

NSLog(@"开始录音");

AVAudioSession *session =[AVAudioSession sharedInstance];

NSError *sessionError;

[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];

if (session == nil) {

NSLog(@"Error creating session: %@",[sessionError description]);

}else{

[session setActive:YES error:nil];

}

self.session = session;

//1.获取沙盒地址

NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

filePath = [path stringByAppendingString:@"/RRecord.wav"];

//2.获取文件路径

self.recordFileUrl = [NSURL fileURLWithPath:filePath];

//设置参数

NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:

//采样率  8000/11025/22050/44100/96000（影响音频的质量）

[NSNumber numberWithFloat: 8000.0],AVSampleRateKey,

// 音频格式

[NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,

//采样位数  8、16、24、32 默认为16

[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,

// 音频通道数 1 或 2

[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,

//录音质量

[NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey,

nil];

_recorder = [[AVAudioRecorder alloc] initWithURL:self.recordFileUrl settings:recordSetting error:nil];

if (_recorder) {

_recorder.meteringEnabled = YES;

[_recorder prepareToRecord];

[_recorder record];

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

[self stopRecord:nil];

});

}else{

NSLog(@"音频格式和文件存储格式不匹配,无法初始化Recorder");

}

第二个按钮方法

NSLog(@"停止录音");

if ([self.recorder isRecording]) {

[self.recorder stop];

}

NSFileManager *manager = [NSFileManager defaultManager];

if ([manager fileExistsAtPath:filePath]){

_noticeLabel.text = [NSString stringWithFormat:@"录了 %ld 秒,文件大小为 %.2fKb",COUNTDOWN - (long)countDown,[[manager attributesOfItemAtPath:filePath error:nil] fileSize]/1024.0];

}else{

_noticeLabel.text = @"最多录60秒";

}

最后一个方法

NSLog(@"播放录音");

[self.recorder stop];

if ([self.player isPlaying])return;

self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:self.recordFileUrl error:nil];

NSLog(@"%li",self.player.data.length/1024);

[self.session setCategory:AVAudioSessionCategoryPlayback error:nil];

[self.player play];