iOS原生录音功能

//

// ViewController.m

// 录音

//

// Created by cjw on 16/7/11.

// Copyright © 2016年 ch. All rights reserved.

//

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

#define kRecordAudioFile @"myRecord.caf"

@interface
ViewController ()<AVAudioRecorderDelegate>

@property (nonatomic,strong)AVAudioRecorder
* audioRecorder;//音频录音机

@property (nonatomic,strong)AVAudioPlayer
* audioPlayer;//音频播放器，用于播放录音

@property (nonatomic,strong)NSTimer
* timer;//录音声波监控；

@property (weak,
nonatomic) IBOutlet
UIButton *record;

@property (weak,
nonatomic) IBOutlet
UIButton *pause;

@property (weak,
nonatomic) IBOutlet
UIButton *resume;

@property (weak,
nonatomic) IBOutlet
UIButton *stop;

@property (weak,
nonatomic) IBOutlet
UIProgressView *audioPower;

@end

@implementation ViewController

- (void)viewDidLoad {

[super
viewDidLoad];

[self
setAudioSession];

}

#pragma mark - 私有方法

/**

* 设置音频会话

*

*/

-(void)setAudioSession

{

AVAudioSession * audioSession = [AVAudioSession
sharedInstance];

//设置为播放和录制状态，以便在录制完成之后播放录音

[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord
error:nil];

[audioSession setActive:YES
error:nil];

}

/**

* 取得录音文件的保存路径

*

* @return 录音文件的路径

*/

-(NSURL *)getSavePath

{

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

urlStr = [urlStr stringByAppendingPathComponent:kRecordAudioFile];

NSLog(@"file:path:%@",urlStr);

NSURL * url = [NSURL
fileURLWithPath:urlStr];

return url;

}

/**

* 取得录音文件的设置

*

* @return 录音设置

*/

-(NSDictionary *)getAudioSettion

{

NSMutableDictionary * dicM = [NSMutableDictionary
dictionary];

//设置录音格式

[dicM setObject:@(kAudioFormatLinearPCM)
forKey:AVFormatIDKey];

//设置录音采样率，8000是电话采样率，对于一般的录音已经够了

[dicM setObject:@(8000)
forKey:AVSampleRateKey];

//设置通道，这里采用单声道

[dicM setObject:@(1)
forKey:AVNumberOfChannelsKey];

//每个采样点位数，分为8，16，24，32

[dicM setObject:@(8)
forKey:AVLinearPCMBitDepthKey];

//是否使用浮点数采样

[dicM setObject:@(YES)
forKey:AVLinearPCMIsFloatKey];

//。。。。是他设置

return dicM;

}

/**

* 获得录音机对象

*

* @return 录音机对象

*/

-(AVAudioRecorder * )audioRecorder

{

if (!_audioRecorder) {

//创建录音文件保存路径

NSURL * url =[self
getSavePath];

//创建录音格式设置

NSDictionary * setting = [self
getAudioSettion];

//创建录音机

NSError * error =
nil;

_audioRecorder = [[AVAudioRecorder
alloc]initWithURL:url
settings:setting
error:&error];

_audioRecorder.delegate =
self;

_audioRecorder.meteringEnabled =
YES;//如果要控制声波则必须设置为YES

if(error)

{

NSLog(@"创建录音机对象发生错误，错误信息是：%@",error.localizedDescription);

return
nil;

}

}

return
_audioRecorder;

}

/**

* 创建播放器

*

* @return 播放器

*/

-(AVAudioPlayer *)audioPlayer

{

if (!_audioPlayer) {

NSURL * url = [self
getSavePath];

NSError * error =
nil;

_audioPlayer =[[AVAudioPlayer
alloc]initWithContentsOfURL:url
error:&error];

_audioPlayer.numberOfLoops =
0;

[_audioPlayer
prepareToPlay];

if (error) {

NSLog(@"创建播放器过程出错：错误信息是：%@",error.localizedDescription);

return
nil;

}

}

return
_audioPlayer;

}

/**

* 录音声波监控定时器

*

* @return 定时器

*/

-(NSTimer * )timer

{

if (!_timer) {

_timer = [NSTimer
scheduledTimerWithTimeInterval:0.1f
target:self
selector:@selector(audioPowerChange)
userInfo:nil
repeats:YES];

}

return
_timer;

}

-(void)audioPowerChange

{

[self.audioRecorder
updateMeters];//跟新检测值

float power = [self.audioRecorder
averagePowerForChannel:0];//获取第一个通道的音频，注音音频的强度方位-160到0

CGFloat progerss = (1.0/160)*(power+160);

[self.audioPower
setProgress:progerss];

}

#pragma mark - 按钮点击事件

/**

* 点击录音按钮

*

* @param sender 录音按钮

*/

- (IBAction)recordClick:(id)sender {

if (![self.audioRecorder
isRecording]) {

[self.audioRecorder
record];

self.timer.fireDate = [NSDate
distantPast];

}

}

/**

* 点击暂停按钮

*

* @param sender 暂停按钮

*/

- (IBAction)pauseClick:(id)sender {

if ([self.audioRecorder
isRecording]) {

[self.audioRecorder
pause];\

self.timer.fireDate=[NSDate
distantFuture];

}

}

/**

* 点击恢复按钮

* 恢复录音只需要再次调用record，AVAudioSession会帮助你记录上次录音位置并追加录音

*

* @param sender 恢复按钮

*/

- (IBAction)resumeClick:(id)sender {

[self
recordClick:sender];

}

/**

* 点击停止按钮

*

* @param sender 停止按钮

*/

- (IBAction)stopClick:(id)sender {

[self.audioRecorder
stop];

self.timer.fireDate = [NSDate
distantFuture];

self.audioPower.progress =
0.0;

}

#pragma mark - 录音机代理方法

/**

* 录音完成，录音完成后播放录音

*

* @param recorder 录音机对象

* @param flag 是否成功

*/

-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{

if (![self.audioPlayer
isPlaying]) {

[self.audioPlayer
play];

}

NSLog(@"录音完成!");

}

- (void)didReceiveMemoryWarning {

[super
didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end