iOS 录音 & 播放 oc

//
//  ViewController.m
//  RLAudioRecord
//
//  Created by Rachel on 16/2/26.
//  Copyright © 2016年 Rachel. All rights reserved.
//

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

# define COUNTDOWN 60

@interface ViewController (){

    NSTimer *_timer; //定时器
    NSInteger countDown;  //倒计时
    NSString *filePath;


}

@property (weak, nonatomic) IBOutlet UILabel *noticeLabel;


@property (nonatomic, strong) AVAudioSession *session;


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

@property (nonatomic, strong) AVAudioPlayer *player; //播放器
@property (nonatomic, strong) NSURL *recordFileUrl; //文件地址



@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    
    [[UIDevice currentDevice] setProximityMonitoringEnabled:YES];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sensorStateChange:) name:UIDeviceProximityStateDidChangeNotification object:nil];
}



#pragma mark - 监听是否靠近耳朵
-(void)sensorStateChange:(NSNotificationCenter *)notification;
{
    AVAudioSession *session = [AVAudioSession sharedInstance];
    NSError *sessionError;
    if ([[UIDevice currentDevice] proximityState] == YES)
    {
        //靠近耳朵
        [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
    }
    else
    {
        //远离耳朵
        [session setCategory:AVAudioSessionCategoryPlayback error:&sessionError];
    }
}


- (IBAction)startRecord:(id)sender {
    NSLog(@"开始录音");

    countDown = 60;
    [self addTimer];
    
    AVAudioSession *session =[AVAudioSession sharedInstance];
    NSError *sessionError;
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
    
    if (session == nil) {
        
        NSLog(@"Error creating session: %@",[sessionError description]);
        
    }else{
        [session setActive:YES error:nil];
        
    }
    
    self.session = session;
    
    
    //1.获取沙盒地址
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    filePath = [path stringByAppendingString:@"/RRecord.wav"];
    
    //2.获取文件路径
    self.recordFileUrl = [NSURL fileURLWithPath:filePath];
    
    //设置参数
    NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
                                     //采样率  8000/11025/22050/44100/96000（影响音频的质量）
                                   [NSNumber numberWithFloat: 8000.0],AVSampleRateKey,
                                   // 音频格式
                                   [NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,
                                   //采样位数  8、16、24、32 默认为16
                                   [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
                                   // 音频通道数 1 或 2
                                   [NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
                                   //录音质量
                                   [NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey,
                                   nil];

    
    _recorder = [[AVAudioRecorder alloc] initWithURL:self.recordFileUrl settings:recordSetting error:nil];
    
    if (_recorder) {
        
        _recorder.meteringEnabled = YES;
        [_recorder prepareToRecord];
        [_recorder record];
        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            
            [self stopRecord:nil];
        });
        
    }else{
        NSLog(@"音频格式和文件存储格式不匹配,无法初始化Recorder");
        
    }
    



}


- (IBAction)stopRecord:(id)sender {

   [self removeTimer];
    NSLog(@"停止录音");
    
    if ([self.recorder isRecording]) {
        [self.recorder stop];
    }
    
    
    NSFileManager *manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
        
        _noticeLabel.text = [NSString stringWithFormat:@"录了 %ld 秒,文件大小为 %.2fKb",COUNTDOWN - (long)countDown,[[manager attributesOfItemAtPath:filePath error:nil] fileSize]/1024.0];
        
    }else{
    
        _noticeLabel.text = @"最多录60秒";

    }
    


}



- (IBAction)PlayRecord:(id)sender {
    
    NSLog(@"播放录音");
    [self.recorder stop];
    
    if ([self.player isPlaying])return;
    
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:self.recordFileUrl error:nil];
    
    
    
    NSLog(@"%li",self.player.data.length/1024);
    
   
    
    [self.session setCategory:AVAudioSessionCategoryPlayback error:nil];
    [self.player play];
    

    
    
}


/**
 *  添加定时器
 */
- (void)addTimer
{
    _timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshLabelText) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}

/**
 *  移除定时器
 */
- (void)removeTimer
{
    [_timer invalidate];
    _timer = nil;
    
}


-(void)refreshLabelText{
   
    countDown --;

    _noticeLabel.text = [NSString stringWithFormat:@"还剩 %ld 秒",(long)countDown];


}

@end

https://www.jianshu.com/p/9b8edca8d7c8