前面 我們講了 iOS下播放音效，播放音樂，這一節我們主要講一下iOS錄音功能

上一節地址：http://blog.csdn.net/lwjok2007/article/details/50425324

錄音和播放音樂使用的是同一個框架，都是iOS系統提供的AVFoundation.framwork

首先，還是創建項目 ?

起名：TestAVFoundationRecorder

接下來 導入AVFoundation.framwork

具體操作參照上一節

完成后項目目錄如下

打開項目默認生成ViewController.m 添加代碼

導入頭文件

#import <AVFoundation/AVFoundation.h>
創建變量

@property (nonatomic,strong) AVAudioRecorder *audioRecorder;//音頻錄音機 @property (nonatomic,strong) AVAudioPlayer *audioPlayer;//音頻播放器，用于播放錄音文件 @property (nonatomic,strong) NSTimer *timer;//錄音聲波監控（注意這里暫時不對播放進行監控）@property (strong, nonatomic) UIButton *record;//開始錄音 @property (strong, nonatomic) UIButton *pause;//暫停錄音 @property (strong, nonatomic) UIButton *resume;//恢復錄音 @property (strong, nonatomic) UIButton *stop;//停止錄音 @property (strong, nonatomic) UIProgressView *audioPower;//音頻波動

初始化界面

- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib._record=[[UIButton alloc]initWithFrame:CGRectMake(10, 300, 60, 36)];[_record setTitle:@"錄音" forState:UIControlStateNormal];[_record setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[_record addTarget:self action:@selector(recordClick:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_record];_pause=[[UIButton alloc]initWithFrame:CGRectMake(80, 300, 60, 36)];[_pause setTitle:@"暫停" forState:UIControlStateNormal];[_pause setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[_pause addTarget:self action:@selector(pauseClick:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_pause];_resume=[[UIButton alloc]initWithFrame:CGRectMake(150, 300, 60, 36)];[_resume setTitle:@"恢復" forState:UIControlStateNormal];[_resume setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[_resume addTarget:self action:@selector(resumeClick:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_resume];_stop=[[UIButton alloc]initWithFrame:CGRectMake(220, 300, 60, 36)];[_stop setTitle:@"停止" forState:UIControlStateNormal];[_stop setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[_stop addTarget:self action:@selector(stopClick:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_stop];_audioPower= [[UIProgressView alloc] initWithProgressViewStyle: UIProgressViewStyleDefault];_audioPower.frame=CGRectMake(0, 100, self.view.bounds.size.width, 36);[self.view addSubview:_audioPower];[self setAudioSession]; }

創建一個常量作為錄音文件的名稱

#define kRecordAudioFile @"myRecord.caf"

最后我們實現一下 個個按鈕點擊之后的動作 ?以及錄音等等?

#pragma mark - 私有方法 /*** 設置音頻會話*/ -(void)setAudioSession{AVAudioSession *audioSession=[AVAudioSession sharedInstance];//設置為播放和錄音狀態，以便可以在錄制完之后播放錄音[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];[audioSession setActive:YES error:nil]; }/*** 取得錄音文件保存路徑** @return 錄音文件路徑*/ -(NSURL *)getSavePath{NSString *urlStr=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];NSFileManager *fileManager = [NSFileManager defaultManager];if(![fileManager fileExistsAtPath:urlStr]) //如果不存在{NSLog(@"xxx.txt is not exist");}else{NSLog(@"xxx.txt is exist");}urlStr=[urlStr stringByAppendingPathComponent:kRecordAudioFile];NSLog(@"file path:%@",urlStr);NSURL *url=[NSURL fileURLWithPath:urlStr];return url; }///var/mobile/Applications/F0CCA9DC-FFBE-4701-8396-2E6EB9509292/Documents/myRecord.caf ///var/mobile/Applications/F0CCA9DC-FFBE-4701-8396-2E6EB9509292/Documents/myRecord.caf /*** 取得錄音文件設置** @return 錄音設置*/ -(NSDictionary *)getAudioSetting{NSMutableDictionary *dicM=[NSMutableDictionary dictionary];//設置錄音格式[dicM setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey];//設置錄音采樣率，8000是電話采樣率，對于一般錄音已經夠了[dicM setObject:@(8000) forKey:AVSampleRateKey];//設置通道,這里采用單聲道[dicM setObject:@(1) forKey:AVNumberOfChannelsKey];//每個采樣點位數,分為8、16、24、32[dicM setObject:@(8) forKey:AVLinearPCMBitDepthKey];//是否使用浮點數采樣[dicM setObject:@(YES) forKey:AVLinearPCMIsFloatKey];//....其他設置等return dicM; }/*** 獲得錄音機對象** @return 錄音機對象*/ -(AVAudioRecorder *)audioRecorder{if (!_audioRecorder) {//創建錄音文件保存路徑NSURL *url=[self getSavePath];//創建錄音格式設置NSDictionary *setting=[self getAudioSetting];//創建錄音機NSError *error=nil;_audioRecorder=[[AVAudioRecorder alloc]initWithURL:url settings:setting error:&error];_audioRecorder.delegate=self;_audioRecorder.meteringEnabled=YES;//如果要監控聲波則必須設置為YESif (error) {NSLog(@"創建錄音機對象時發生錯誤，錯誤信息：%@",error.localizedDescription);return nil;}}return _audioRecorder; }/*** 創建播放器** @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(@"創建播放器過程中發生錯誤，錯誤信息：%@",error.localizedDescription);return nil;}}return _audioPlayer; }/*** 錄音聲波監控定制器** @return 定時器*/ -(NSTimer *)timer{if (!_timer) {_timer=[NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(audioPowerChange) userInfo:nil repeats:YES];}return _timer; }/*** 錄音聲波狀態設置*/ -(void)audioPowerChange{[self.audioRecorder updateMeters];//更新測量值float power= [self.audioRecorder averagePowerForChannel:0];//取得第一個通道的音頻，注意音頻強度范圍時-160到0CGFloat progress=(1.0/160.0)*(power+160.0);[self.audioPower setProgress:progress]; }#pragma mark - UI事件 /*** 點擊錄音按鈕** @param sender 錄音按鈕*/- (void)recordClick:(UIButton *)sender { // if (![self.audioPlayer isPlaying]) { // [self.audioPlayer play]; // } //if (![self.audioRecorder isRecording]) {[self.audioRecorder record];//首次使用應用時如果調用record方法會詢問用戶是否允許使用麥克風self.timer.fireDate=[NSDate distantPast];} }/*** 點擊暫定按鈕** @param sender 暫停按鈕*/ - (void)pauseClick:(UIButton *)sender {if ([self.audioRecorder isRecording]) {[self.audioRecorder pause];self.timer.fireDate=[NSDate distantFuture];} }/*** 點擊恢復按鈕* 恢復錄音只需要再次調用record，AVAudioSession會幫助你記錄上次錄音位置并追加錄音** @param sender 恢復按鈕*/ - (void)resumeClick:(UIButton *)sender {[self recordClick:sender]; }/*** 點擊停止按鈕** @param sender 停止按鈕*/ - (void)stopClick:(UIButton *)sender {[self.audioRecorder stop];self.timer.fireDate=[NSDate distantFuture];self.audioPower.progress=0.0; }#pragma mark - 錄音機代理方法 /*** 錄音完成，錄音完成后播放錄音** @param recorder 錄音機對象* @param flag 是否成功*/ -(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{if (![self.audioPlayer isPlaying]) {[self.audioPlayer play];}NSLog(@"錄音完成!"); }

到此 我們基本實現了功能

運行項目看看?

點擊錄音 看看 是不是 可以是用來 。點擊停止之后錄音結束并且自動開發播放錄音

項目代碼我們會上傳群空間【51230AVFoundationRecorder.zip】?

蘋果開發群 ：512298106 ?歡迎加入 ?歡迎討論問題

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