iOS设备发送语音信息相关功能代码

摘要: 通过AVAudioRecorder录取语音信息，用AVAudioPlayer实现对语音的播放试听，再通过AFNetworking的post上传。基本实现了从语音的录取，试听播放，到上传至服务器等一系列的操作。

首先得对AVAudioSession音频会话对象进行设置：

//获取AVAudioSession对象
_audioSession = [AVAudioSession sharedInstance];
//设置类别，该类别允许应用同时进行声音的播放和录制
[_audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];

再对AVAudioRecorder进行基本设置（如通道数，采样率，录音格式等）：

//对AVAudioRecorder进行一些设置
NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithFloat: 44100.0],AVSampleRateKey,
[NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,
[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
[NSNumber numberWithInt: 2], AVNumberOfChannelsKey,
[NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey, nil];

//录音存放的地址文件
_recordingUrl = [NSURL URLWithString:[NSTemporaryDirectory() stringByAppendingString:@"myRecord.wav"]];
//初始化AVAudioRecorder
_audioRecorder = [[AVAudioRecorder alloc] initWithURL:_recordingUrl settings:recordSetting error:nil];
//对录音开启音量检测
_audioRecorder.meteringEnabled = YES;
//设置代理
_audioRecorder.delegate = self;

设置一个录音按钮，添加两个事件，分别在长按按钮和松开长按按钮时执行，长按时录音开始进行，松开后录音结束：

//长按录音
- (void)StartRecordingVoice
{
NSLog(@"开始  录音");

//判断是否是第一次录制
if (recordNumber > 1) {
[self recordAgain];
}

_audioSession = [AVAudioSession sharedInstance];

if (!_audioRecorder.recording) {

recordNumber++;

hasVoice = YES;
_timesLabel.hidden = NO;
_textLabel.text = @"放开  停止";

[_audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[_audioSession setActive:YES error:nil];

[_audioRecorder prepareToRecord];
[_audioRecorder peakPowerForChannel:0.0];
[_audioRecorder record];

recordTime = 0;
//刷新时间
[self recordTimeStart];
}
}
- (void)recordTimeStart
{
timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(recordTime) userInfo:nil repeats:YES];
}

- (void)recordTime
{
recordTime += 1;
if (recordTime == 30) {
recordTime = 0;
[_audioRecorder stop];
[[AVAudioSession sharedInstance] setActive:NO error:nil];

[timer invalidate];
_timesLabel.text = @"00:00";

return;
}
[self updateRecordTime];
}
- (void)updateRecordTime
{
minute = recordTime/60.0;
second = recordTime-minute*60;

_timesLabel.text = [NSString stringWithFormat:@"%02d:%02d", minute, second];
}

//停止录音
- (void)StopRecordingVoice
{
NSLog(@"停止  录音");

_audioSession = [AVAudioSession sharedInstance];

if (_audioRecorder.isRecording) {
int seconds = minute*60+second;
_voiceTimes.text = [NSString stringWithFormat:@"%d\" ",seconds];

_voiceImageView.hidden = NO;
_voiceTimes.hidden = NO;
_textLabel.text = @"长按  录音";

[_audioRecorder stop];
[_audioSession setActive:NO error:nil];
[timer invalidate];

[self updateRecordTime];
}
}

设置一个播放按钮，第一次点击时开始播放，再点击时停止播放：

//播放录音
- (void)PlayVoice
｛
_audioSession = [AVAudioSession sharedInstance];

if (isPlay) {
NSLog(@"暂停");
[_playButton setImage:[UIImage imageNamed:@"voice_play.png"] forState:UIControlStateNormal];
isPlay = NO;

[_voiceImageView stopAnimating];

[_audioPlayer pause];
[_audioSession setActive:NO error:nil];
} else {
NSLog(@"播放中");
_voiceImageView.hidden = NO;
_voiceTimes.hidden = NO;
[_voiceImageView startAnimating];

[_playButton setImage:[UIImage imageNamed:@"voice_pause.png"] forState:UIControlStateNormal];
isPlay = YES;

[_audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[_audioSession setActive:YES error:nil];

NSError *error = nil;
if (_recordingUrl != nil) {
_audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:_recordingUrl error:&error];
}
if (error) {
NSLog(@"error:%@", [error description]);
}

[_audioPlayer prepareToPlay];
_audioPlayer.volume = 1;
[_audioPlayer play];

//播放时间
playDuration = (int)_audioPlayer.duration;
playTimes = 0;
[self audioPlayTimesStart];
}

｝

//播放时间
- (void)audioPlayTimesStart
{
timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(playTimeTick) userInfo:nil repeats:YES];
}
- (void)playTimeTick
{
//当播放时长等于音频时长时，停止跳动。
if (playDuration == playTimes) {
NSLog(@"已播完");

isPlay = NO;
[_playButton setImage:[UIImage imageNamed:@"voice_play.png"] forState:UIControlStateNormal];
[_voiceImageView stopAnimating];

playTimes = 0;
[_audioPlayer stop];
[[AVAudioSession sharedInstance] setActive:NO error:nil];

[timer invalidate];
return;
}
if (!_audioPlayer.isPlaying) {
return;
}
playTimes += 1;
NSLog(@"playDuration:%d playTimes:%d", playDuration, playTimes);
}

设置一个发送语音信息按钮：

(void)postVoice{
MBProgressHUD *HUD = [Utils createHUD];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFOnoResponseSerializer XMLResponseSerializer];

[manager POST:_postUrl
parameters:@{
@"userId": @([Config getOwnID]),
@"message": [Utils convertRichTextToRawText:_edittingArea]
}
constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

if (_recordingUrl.absoluteString.length) {

NSError *error = nil;

NSString *voicePath = [NSString stringWithFormat:@"%@myRecord.wav", NSTemporaryDirectory()];

[formData appendPartWithFileURL:[NSURL fileURLWithPath:voicePath isDirectory:NO]
name:@"amr"
fileName:@"myRecord.wav"
mimeType:@"audio/mpeg"
error:&error];

}
}
success:^(AFHTTPRequestOperation *operation, ONOXMLDocument *responseDocument) {
ONOXMLElement *result = [responseDocument.rootElement firstChildWithTag:@"result"];
int errorCode = [[[result firstChildWithTag:@"errorCode"] numberValue] intValue];
NSString *errorMessage = [[result firstChildWithTag:@"errorMessage"] stringValue];

HUD.mode = MBProgressHUDModeCustomView;
[HUD show:YES];

if (errorCode == 1) {
_edittingArea.text = @"";

HUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"HUD-done"]];
HUD.labelText = @"语音发表成功";
} else {
HUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"HUD-error"]];
HUD.labelText = [NSString stringWithFormat:@"错误：%@", errorMessage];
}

[HUD hide:YES afterDelay:1];

[self dismissViewControllerAnimated:YES completion:nil];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
HUD.mode = MBProgressHUDModeCustomView;
HUD.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"HUD-error"]];
HUD.labelText = @"网络异常，语音发送失败";

[HUD hide:YES afterDelay:1];
}];

}