iOS录音简单实现

<AVFoundation/AVFoundation.h>

#import <AVFoundation/AVFoundation.h>

/** 时间显示 */
@property (weak, nonatomic) IBOutlet UILabel      *timeLabel;

/** 播放按钮 */
@property (weak, nonatomic) IBOutlet UIButton     *playButton;

/** 重置按钮 */
@property (weak, nonatomic) IBOutlet UIButton     *resetButton;

/** 录音 */
@property (nonatomic, strong) AVAudioRecorder *recorder;

/** 播放 */
@property (nonatomic, strong) AVAudioPlayer   *player;

/** 定时器 */
@property (nonatomic, strong) NSTimer         *timer;

/** 录音url */
@property (nonatomic, strong) NSString        *playName;

- (void)viewDidLoad {

[super viewDidLoad];

[self setupRecorder];

self.timeLabel.text = @"00:00.00";

}

- (void)setupRecorder {

if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending) {
//7.0第一次运行会提示，是否允许使用麦克风
AVAudioSession *session = [AVAudioSession sharedInstance];
NSError *sessionError;
//AVAudioSessionCategoryPlayAndRecord用于录音和播放
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
if(session == nil)
NSLog(@"Error creating session: %@", [sessionError description]);
else
[session setActive:YES error:nil];
}

NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
self.playName = [NSString stringWithFormat:@"%@/play.aac",docDir];
//录音设置
self.recorderSettingsDict =[[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatMPEG4AAC],AVFormatIDKey,
[NSNumber numberWithInt:44100.0],AVSampleRateKey,
[NSNumber numberWithInt:2],AVNumberOfChannelsKey,
[NSNumber numberWithInt:8],AVLinearPCMBitDepthKey,
[NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,
[NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,
nil];

NSError *error = nil;
//必须真机上测试,模拟器上可能会崩溃
self.recordering = [[AVAudioRecorder alloc] initWithURL:[NSURL URLWithString:self.playName]
settings:self.recorderSettingsDict
error:&error];

if (self.recordering) {

// 打开音量检测
self.recordering.meteringEnabled = YES;

// 创建文件准备录音
[self.recordering prepareToRecord];

// 开始录音
[self.recordering record];

//启动定时器
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(levelTimer:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
}
}
- (void)levelTimer:(NSTimer *)time {

// 后面stringFormatWithTimeInterval是自己写的方法用于转换时间格式
self.timeLabel.text = [NSString stringFormatWithTimeInterval:self.recordering.currentTime];

}

[self.recordering stop];
self.recordering = nil;

[self.timer invalidate];
self.timer = nil;

self.player = nil;
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:self.playName] error:&playerError];

//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] forKey:AVSampleRateKey];
//录音通道数 1 或 2
[recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
//线性采样位数 8、16、24、32
[recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
//录音的质量
[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];