ios 使用AVAudioRecorder錄製音頻,然後用AVAudioPlayer進行播放

iOS為我們提供了AVFoundation FrameWork，即Audio/Video基礎類庫,通過使用這個類庫，可以在應用程式中實現錄製，播放視頻，音頻等功能,使用起來非常方便。

AVFoundation架構的作用
AVFoundation架構提供一系列的Class(類)，在iPhone OS相關結構中，負責對象管理和播放視聽媒體，當引入此標頭檔後，便可以在程式裡使用任何在AVFoundation裡聲明的類：

#import <AVFoundation/AVAudionPlayer.h>

說明：AVAudioPlayer是iPhoneOS中的聲音播放器架構，使程式支援廣泛的音頻格式播放，格式包括AAC、AMR、ALAC、iLBC、IMA4、linearPCM和MP3等。
下面通過代碼的形式介紹AVAudioRecorder，AVAudioPlayer的基本使用。如有不足,還請大家多指點,以達到共同學習的目的!
廢話不多說,直接上代碼。

xib展示:
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說明:1圖和2圖中選中的兩個Button用於錄音時的動畫展示原理是:看圖,
底部一個Button,上面在疊加一個Button,兩個Button的backgroundImage為同一張圖片,但上層的Button大小較下面小一圈,通過調整底層Button的alpha達到動畫效果。

下面是該介面所需的代碼:
提示:添加AVFoundation架構並匯入

#import <AVFoundation/AVFoundation.h>#import "AddAttachmentsViewController.h"@interface SoundRecordingViewController () <AVAudioRecorderDelegate>{    NSTimer *_timer1;    NSTimer *_timer2;    NSString *_audioFilePath;}@property (nonatomic,assign)int minute, second, btnSeconds;  //分,秒,秒數累加@property (weak, nonatomic) IBOutlet UIButton *animateBtn;@property (weak, nonatomic) IBOutlet UILabel *timeLabel;@property (nonatomic, strong) AVAudioRecorder *audioRecorder;@property (nonatomic, strong) AVAudioPlayer *audioPlayer;@property (nonatomic, strong) NSString *fileURL;@end@implementation SoundRecordingViewController- (void)viewDidLoad{    [super viewDidLoad];    [self setAudioSession];}#pragma mark - Outlet Aciton Event//按住開始錄音- (IBAction)clickToStartRecording:(UIButton *)sender{    _minute = 0;    _second = 0;    _btnSeconds = 0;    _timeLabel.text = @"0:00";    if (_audioFilePath.length > 0) {        NSError *error = nil;        [[NSFileManager defaultManager] removeItemAtPath:_audioFilePath error:&error];    }    if (![self.audioRecorder isRecording]) {        [self.audioRecorder prepareToRecord];        //首次使用應用時如果調用record方法會詢問使用者是否允許使用麥克風        [self.audioRecorder record];    }    [_timer1 invalidate];    _timer1 = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(startAnimate) userInfo:nil repeats:YES];    [_timer2 invalidate];    _timer2 = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(changeTimeLabel) userInfo:nil repeats:YES];}//鬆開停止錄音- (IBAction)clickToStopRecording:(UIButton *)sender{    [self.audioRecorder stop];    [_timer1 invalidate];    [_timer2 invalidate];    _animateBtn.transform = CGAffineTransformMakeScale(1, 1);}- (void)startAnimate{    static BOOL alpha = YES;    [UIView animateWithDuration:1.0f animations:^{        _animateBtn.alpha = alpha;    }];    alpha = !alpha;}-(void)changeTimeLabel{    if(_second < 60) { //秒        _second ++;    } else if(_second == 60) { //分        _second = 0;        _minute++;    }    if (_second < 10) {        _timeLabel.text = [NSString stringWithFormat:@"%d:0%d",_minute,_second];    }else{        _timeLabel.text = [NSString stringWithFormat:@"%d:%d",_minute,_second];    }    _btnSeconds ++;}//設定音頻會話- (void)setAudioSession{    AVAudioSession *audioSession = [AVAudioSession sharedInstance];    //設定為播放和錄音狀態，以便可以在錄製完之後播放錄音    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];    [audioSession setActive:YES error:nil];}//擷取錄音檔案設定- (NSDictionary *)getAudioSetting{    NSMutableDictionary *recordSetting = [NSMutableDictionary dictionary];    //設定錄音格式    [recordSetting setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey];    //設定錄音採樣率,8000是電話採樣率,對於一般錄音已經夠用了    [recordSetting setObject:@(8000) forKey:AVSampleRateKey];    //設定通道為單聲道    [recordSetting setObject:@(2) forKey:AVNumberOfChannelsKey];    //每個採樣點位元,分為8,16,24,32    [recordSetting setObject:@(8) forKey:AVLinearPCMBitDepthKey];    //是否使用浮點數採樣    [recordSetting setObject:@(YES) forKey:AVLinearPCMIsFloatKey];    return recordSetting;}//重寫get:錄音機對象- (AVAudioRecorder *)audioRecorder{    if (!_audioRecorder) {        _audioFilePath = [self getSavePathWithFileSuffix:@"caf"];        //錄音檔案儲存路徑        _fileURL = [NSURL fileURLWithPath:_audioFilePath];        //錄音格式設定        NSDictionary *setting = [self getAudioSetting];        //建立錄音機        NSError *error = nil;        _audioRecorder = [[AVAudioRecorder alloc] initWithURL:_fileURL settings:setting error:&error];        if (error) {            NSLog(@"建立錄音機失敗,錯誤資訊:%@",error);            return nil;        }    }    return _audioRecorder;}//播放本地音頻檔案的觸發時間,可以添加按鈕或其他來觸發播放- (void)playAudioFiles{    _audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:_fileURL error:&error];                if (error == nil) {                    _audioPlayer.currentTime = 0;                    [_audioPlayer play];                }} //擷取檔案名稱:由時間+尾碼組成+ (NSString *)getSavePathWithFileSuffix:(NSString *)suffix{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentPath = [paths objectAtIndex:0];    NSDate *date = [NSDate date];    //擷取目前時間    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];    [dateFormat setDateFormat:@"yyyyMMddHHmmss"];    NSString *curretDateAndTime = [dateFormat stringFromDate:date];    //命名檔案    NSString *fileName = [NSString stringWithFormat:@"%@.%@",curretDateAndTime,suffix];    //指定檔案儲存體路徑    NSString *filePath = [documentPath stringByAppendingPathComponent:fileName];    return filePath;}