<AudioToolbox/AudioToolbox.h> :这个库是C的接口，偏向于底层，主要用于在线流媒体的播放
<AVFoundation/AVFoundation.h> :提供了音频和回放的底层API，同时也负责管理音频的硬件
//需要遵循一个代理协议<AVAudioRecorderDelegate>
//// ViewController.m// 录音录频//#import "ViewController.h"//提供了音频和回放的底层API，同时也负责管理音频硬件#import <AVFoundation/AVFoundation.h>//这个库是C的接口，偏向于底层，主要用于在线流媒体的播放#import <AudioToolbox/AudioToolbox.h>@interface ViewController () <AVAudioRecorderDelegate>{ //用来录音 AVAudioRecorder *recorder; //设置定时检测，用来监听当前音量大小，控制话筒图片 NSTimer *timer; //设置一个路径，用来保存本地录音的路径 NSURL *urlPlay; }//用来控制录音功能@property (nonatomic, strong) UIButton *btn;//用来播放已经录好的音频文件@property (nonatomic, strong) UIButton *playBtn;//控制音量的图片@property (nonatomic, strong) UIImageView *imageView;//音频播放器@property (nonatomic, strong) AVAudioPlayer *paly;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; //基本步骤：1.进行录音设置（先配置录音机（是一个字典），设置录音的格式，录音的采样率，录音的先行采样位数，录音的通道数，录音质量，录音路径，初始化录音对象，开启音量检测）；2.设置录音按钮的功能（UI设置）3.设置播放按钮并实现播放功能 //1.进行录音设置 [self audio]; //实现录音按钮的功能（UI设置） //2.加图片 self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake((self.view.frame.size.width - 100)/2, 100, 100, 100)]; self.imageView.backgroundColor = [UIColor redColor]; self.btn = [UIButton buttonWithType:UIButtonTypeCustom]; self.btn.frame = CGRectMake(self.imageView.frame.origin.x, 250, 50, 40); [self.btn setTitle:@"开始" forState:UIControlStateNormal]; [self.btn setBackgroundColor:[UIColor greenColor]]; self.playBtn = [UIButton buttonWithType:UIButtonTypeCustom]; self.playBtn.frame = CGRectMake(self.imageView.frame.origin.x + 50, 250, 50, 40); [self.playBtn setTitle:@"播放" forState:UIControlStateNormal]; [self.playBtn setBackgroundColor:[UIColor cyanColor]]; [self.playBtn addTarget:self action:@selector(paly:) forControlEvents:UIControlEventTouchUpInside]; //设置按钮的事件，当按钮被按下时 [self.btn addTarget:self action:@selector(btnDown:) forControlEvents:UIControlEventTouchDown]; //当手指抬起时 [self.btn addTarget:self action:@selector(btnUp:) forControlEvents:UIControlEventTouchUpInside]; //当触摸拖动离开控制范围时 [self.btn addTarget:self action:@selector(btnDragUp:) forControlEvents:UIControlEventTouchDragExit]; [self.view addSubview:self.playBtn]; [self.view addSubview:self.btn]; [self.view addSubview:self.imageView]; }//点击播放按钮的实现播放- (void)paly:(UIButton *)sender{ //加载本地录音文件 self.paly = [[AVAudioPlayer alloc] initWithContentsOfURL:urlPlay error:nil]; //准备播放 [self.paly prepareToPlay]; //播放 [self.paly play]; }//录音设置的方法- (void)audio{ //1.先配置Recorder(录音机) NSMutableDictionary *recorderSetting = [NSMutableDictionary dictionary];
//2.设置录音的格式 / *在2000年被用在MPEG-4中（ISO 14496-3 Audio），所以现在变更为MPEG-4 AAC标准，也就是说，AAC已经成为MPEG4家族的主要成员之一，它是MPEG4第三部分中的音频编码系统。AAC可提供最多48个全音域音频通道。*/
[recorderSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey]; //3.设置录音采样率 --采样频率是指录音设备在一秒钟内对声音信号的采样次数，采样频率越高声音的还原就越真实越自然。在当今的主流声卡上，采样频率一般共分为22.05KHz、44.1KHz、48KHz三个等级，22.05只能达到FM广播的声音品质，44.1KHz则是理论上的CD音质界限，48KHz则更加精确一些 [recorderSetting setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey]; //4.设置录音的通道数 [recorderSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
//5.线性采样位数 8 ，16 ，24 ，32、采样位数可以理解为声卡处理声音的解析度。这个数值越大，解析度就越高，录制和回放的声音就越真实 --一般都是16位的（2的16次方）/*
PCM的基本参数是和采样位深，就是每秒采样多少次，位深就是声音通过拾音器转成的被量化的精细度，同时也代表一次采样会用多少位保存
*/
[recorderSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; //6,录音质量 [recorderSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey]; //设置录音路径 NSString *strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/record.aac",strUrl]]; //记录当前路径 urlPlay = url; //初始化录音对象 NSError *error; recorder = [[AVAudioRecorder alloc] initWithURL:url settings:recorderSetting error:&error]; //开启音量检测 recorder.meteringEnabled = YES; recorder.delegate = self;}- (void)btnDown:(UIButton *)sender{ [sender setTitle:@"停止" forState:UIControlStateNormal]; //创建录音文件，准备录音 if([recorder prepareToRecord]){ //开始 [recorder record]; } //设置定时检测，检测我们的图片 timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(detectionVioce) userInfo:nil repeats:YES]; }- (void)btnUp:(UIButton *)sender{ //UI状态 [sender setTitle:@"开始" forState:UIControlStateNormal]; //记录当前时间 double cTime = recorder.currentTime; if (cTime > 2) { NSLog(@"放出去"); }else{ //删除我们的记录文件 [recorder deleteRecording]; } //停止录音 [recorder stop]; //停止计时器 [timer invalidate];}
- (void)btnDragUp:(UIButton *)sender{ [sender setTitle:@"开始" forState:UIControlStateNormal]; //删除录制文件 [recorder deleteRecording]; //停止录音 [recorder stop]; //停止计时器 [timer invalidate]; NSLog(@"取消发送"); }//检测当前声音- (void)detectionVioce{ //刷新当前音量数据 [recorder updateMeters]; //获取音量的平均值 double lowPassResults = pow(10, (0.05 * [recorder peakPowerForChannel:0]));//×于当前音量 //现在取值范围在0~1 (每隔0.7) if(0 < lowPassResults < 0.06){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(1)"]]; }else if( 0.06< lowPassResults <= 0.13){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(2)"]]; }else if( 0.13<lowPassResults <= 0.20){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(3)"]]; }else if( 0.20 <lowPassResults <= 0.27){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(4)"]]; }else if( 0.27 <lowPassResults <= 0.34){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(5)"]]; }else if( 0.34 <lowPassResults <= 0.41){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(6)"]]; }else if( 0.41 <lowPassResults <= 0.48){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(7)"]]; }。。。。。){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(8)"]]; }else if( 0.55 <lowPassResults <= 0.62){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(9)"]]; }else if( 0.62 <lowPassResults <= 0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(8)"]]; }else if( 0.55 <lowPassResults <= 0.62){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(9)"]]; }else if( 0.62 <lowPassResults <= 0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }else if( 0.69 <lowPassResults <= 0.76){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(11)"]]; }else if( 0.76 <lowPassResults <= 0.83){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(12)"]]; }else if( 0.83 <lowPassResults <= 0.90){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(13)"]]; }else{ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(14)"]]; }else if( 0.48 <lowPassResults <= 0.55){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(8)"]]; }else if( 0.55 <lowPassResults <= 0.62){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(9)"]]; }else if( 0.62 <lowPassResults <= 0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }else if( 0.69 <lowPassResults <= 0.76){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(11)"]]; }else if( 0.76 <lowPassResults <= 0.83){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(12)"]]; }else if( 0.83 <lowPassResults <= 0.90){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(13)"]]; }else{ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(14)"]]; }else if( 0.48 <lowPassResults <= 0.55){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(8)"]]; }else if( 0.55 <lowPassResults <= 0.62){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(9)"]]; }else if( 0.62 <lowPassResults <= 0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }else if( 0.69 <lowPassResults <= 0.76){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(11)"]]; }else if( 0.76 <lowPassResults <= 0.83){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(12)"]]; }else if( 0.83 <lowPassResults <= 0.90){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(13)"]]; }else{ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(14)"]]; }else if( 0.48 <lowPassResults <= 0.55){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(8)"]]; }else if( 0.55 <lowPassResults <= 0.62){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(9)"]]; }else if( 0.62 <lowPassResults <= 0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }else if( 0.69 <lowPassResults <= 0.76){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(11)"]]; }else if( 0.76 <lowPassResults <= 0.83){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(12)"]]; }else if( 0.83 <lowPassResults <= 0.90){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(13)"]]; }else{ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(14)"]]; }){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(8)"]]; }else if( 0.55 <lowPassResults <= 0.62){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(9)"]]; }else if( 0.62 <lowPassResults <= 0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }else if( 0.69 <lowPassResults <= 0.76){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(11)"]]; }else if( 0.76 <lowPassResults <= 0.83){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(12)"]]; }else if( 0.83 <lowPassResults <= 0.90){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(13)"]]; }else{ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(14)"]]; }0.69){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(10)"]]; }else if( 0.69 <lowPassResults <= 0.76){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(11)"]]; }else if( 0.76 <lowPassResults <= 0.83){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(12)"]]; }else if( 0.83 <lowPassResults <= 0.90){ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(13)"]]; }else{ [self.imageView setImage:[UIImage imageNamed:@"iconfont-huatong(14)"]];