录音要借助于AVAudioPlayer ，它是 AVFoundation.framework 中定义的一个类，所以使用要先在工程中引入AVFoundation.framework。我们可以把 AVAudioPlayer看作是一个高级的播放器，它支持广泛的音频格式。
MainViewController.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface MainViewController : UIViewController<AVAudioRecorderDelegate>
{
AVAudioRecorder *recorder;
NSTimer *timer;
NSURL *urlPlay;
}
@property(nonatomic,retain)UIButton *btn;
@property(nonatomic,retain)UIButton *playButton;
@property(nonatomic,retain)UIImageView *imageView;
@property(nonatomic,retain)AVAudioPlayer *avPlay;
@end
MainViewController.m
#import "MainViewController.h"
@interface MainViewController ()
@end
@implementation MainViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self audio];
self.btn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
self.btn.frame=CGRectMake(50, 300, 100, 80);
[self.btn setTitle:@"录音" forState:UIControlStateNormal];
self.btn.backgroundColor=[UIColor redColor];
self.btn.alpha=0.6;
//按录音按钮的方法
[self.btn addTarget:self action:@selector(btnDown:) forControlEvents:UIControlEventTouchDown];
//松开录音按钮的方法
[self.btn addTarget:self action:@selector(btnUP:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.btn];
self.playButton=[UIButton buttonWithType:UIButtonTypeRoundedRect];
self.playButton.frame=CGRectMake(190, 300, 100, 80);
[self.playButton setTitle:@"播放" forState:UIControlStateNormal];
self.playButton.backgroundColor=[UIColor redColor];
self.playButton.alpha=0.6;
//按播放按钮的方法
[self.playButton addTarget:self action:@selector(playButtonAction:) forControlEvents:UIControlEventTouchDown];
[self.view addSubview:self.playButton];
self.imageView=[[UIImageView alloc]initWithFrame:CGRectMake(80, 30, 160, 200)];
self.imageView.backgroundColor=[UIColor greenColor];
[self.view addSubview:self.imageView];
}
#pragma mark - 录音按钮按下的方法
-(void)btnDown:(UIButton *)sender
{
//创建录音文件，准备录音
if ([recorder prepareToRecord])
{
NSFileManager *fm = [NSFileManager defaultManager];
[fm createFileAtPath:urlPlay.description contents:nil attributes:nil];
//开始
[recorder record];
//设置定时监测
timer=[NSTimer scheduledTimerWithTimeInterval:0 target:self selector:@selector(detectionVoice:) userInfo:nil repeats:YES];
NSLog(@"down");
}
}
//这里其实可以根据音量大小的比例 用一个view的高度来显示
-(void)detectionVoice:(NSTimer *)time
{
[recorder updateMeters];//刷新音量数据
//获取音量的平均值 [recorder averagePowerForChannel:0];
//音量的最大值 [recorder peakPowerForChannel:0];
double lowPassResults=pow(10, (0.05*[recorder peakPowerForChannel:0]));
NSLog(@"%lf",lowPassResults);
//图片 小->大
if (0<lowPassResults<=0.06)
{
[self.imageView setImage:[UIImage imageNamed:@"record_animate_01.png"]];
}else if (0.06<lowPassResults<=0.13) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_02.png"]];
}else if (0.13<lowPassResults<=0.20) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_03.png"]];
}else if (0.20<lowPassResults<=0.27) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_04.png"]];
}else if (0.27<lowPassResults<=0.34) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_05.png"]];
}else if (0.34<lowPassResults<=0.41) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_06.png"]];
}else if (0.41<lowPassResults<=0.48) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_07.png"]];
}else if (0.48<lowPassResults<=0.55) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_08.png"]];
}else if (0.55<lowPassResults<=0.62) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_09.png"]];
}else if (0.62<lowPassResults<=0.69) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_10.png"]];
}else if (0.69<lowPassResults<=0.76) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_11.png"]];
}else if (0.76<lowPassResults<=0.83) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_12.png"]];
}else if (0.83<lowPassResults<=0.9) {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_13.png"]];
}else {
[self.imageView setImage:[UIImage imageNamed:@"record_animate_14.png"]];
}
}
- (void) updateImage
{
[self.imageView setImage:[UIImage imageNamed:@"record_animate_01.png"]];
}
/* audioRecorderDidFinishRecording:successfully: is called when a recording has been finished or stopped. This method is NOT called if the recorder is stopped due to an interruption. */
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag
{
NSLog(@"%d",flag);
}
/* if an error occurs while encoding it will be reported to the delegate. */
- (void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)recorder error:(NSError *)error
{
NSLog(@"%@",[error description]);
}
#pragma mark - 松开录音按钮方法
-(void)btnUP:(UIButton *)sender
{
NSLog(@"up");
double cTime=recorder.currentTime;
if (cTime>1)//录制时间<1不发送
{
NSLog(@"发送出去");
}
else
{
//删除记录文件-之前的文件
[recorder deleteRecording];
}
[recorder stop];
[timer invalidate];
[self updateImage];
}
#pragma -mark - 播放按钮的方法
-(void)playButtonAction:(UIButton *)sender
{
if (self.avPlay.playing)
{
[self.avPlay stop];
return;
}
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
AVAudioPlayer *player=[[AVAudioPlayer alloc]initWithContentsOfURL:urlPlay error:nil];
self.avPlay=player;
[self.avPlay play];
}
-(void)audio
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryRecord error:nil];
//录音设置
NSMutableDictionary *recordSetting=[[NSMutableDictionary alloc]init];
//设置录音格式 AVFormatIDKey==kAudioFormatLinearPCM
[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
//设置录音采样率（Hz）如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
[recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
//录音通道数
[recordSetting setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
//[recordSetting setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey];//解码率
//线性采样位数 8/16/24/32
[recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
//录音质量
[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];
NSString *strUrl=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
NSURL *url=[NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/lll.caf",strUrl]];
NSLog(@"%@",url);
urlPlay=url;
NSError *error;
//初始化
recorder=[[AVAudioRecorder alloc]initWithURL:url settings:recordSetting error:&error];
//开启音量检测
recorder.meteringEnabled=YES;
recorder.delegate=self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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