调用麦克风录音及播放

导入AVFoundation.framework

引入#import

//定义属性
{
    //录音器
    AVAudioRecorder *recorder;
    //播放器
    AVAudioPlayer *player;
    NSDictionary *recorderSettingsDict;
    //录音名字
    NSString *playName;
}

在  viewDidLoad 里面初始化

NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    playName = [NSString stringWithFormat:@"%@/play.aac",docDir];
    //录音设置
    recorderSettingsDict =[[NSDictionary alloc] initWithObjectsAndKeys:
                           [NSNumber numberWithInt:kAudioFormatMPEG4AAC],AVFormatIDKey,
                           [NSNumber numberWithInt:1000.0],AVSampleRateKey,
                           [NSNumber numberWithInt:2],AVNumberOfChannelsKey,
                           [NSNumber numberWithInt:8],AVLinearPCMBitDepthKey,
                           [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,
                           [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,
                           nil];

录音按钮的UIControlEventTouchUpInside方法响应:

//松开 结束录音
//录音停止
    [recorder stop];
    recorder = nil;

录音按钮的 UIControlEventTouchDown方法响应:

//按下录音
    if ([self canRecord]) {
        
        NSError *error = nil;
        //必须真机上测试,模拟器上可能会崩溃
        recorder = [[AVAudioRecorder alloc] initWithURL:[NSURL URLWithString:playName] settings:recorderSettingsDict error:&error];
        
        if (recorder) {
            recorder.meteringEnabled = YES;
            [recorder prepareToRecord];
            [recorder record];
            
            //启动定时器
            timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(levelTimer:) userInfo:nil repeats:YES];
            
        } else
        {
            int errorCode = CFSwapInt32HostToBig ([error code]);
            NSLog(@"Error: %@ [%4.4s])" , [error localizedDescription], (char*)&errorCode);
            
        }
    }

//判断是否允许使用麦克风7.0新增的方法requestRecordPermission
-(BOOL)canRecord
{
    __block BOOL bCanRecord = YES;
    if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending)
    {
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
            [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                if (granted) {
                    bCanRecord = YES;
                }
                else {
                    bCanRecord = NO;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        [[[UIAlertView alloc] initWithTitle:nil
                                                    message:@"app需要访问您的麦克风。\n请启用麦克风-设置/隐私/麦克风"
                                                   delegate:nil
                                          cancelButtonTitle:@"关闭"
                                          otherButtonTitles:nil] show];
                    });
                }
            }];
        }
    }
    
    return bCanRecord;
}

播放按钮响应方法

NSError *playerError;
    
    //播放
    player = nil;
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:playName] error:&playerError];
    
    if (player == nil)
    {
        NSLog(@"ERror creating player: %@", [playerError description]);
    }else{
        [player play];
    }