? ? ? ? 最近終于有一點時間抽空來看看最近的新技術(shù)，然后發(fā)現(xiàn)了蘋果在去年出的新框架，可以直接語音轉(zhuǎn)文字，簡直厲害了，直接完爆了某些大公司。但是缺點在于只支持iOS10以上的系統(tǒng)，但是也算是一大進步，贊一個。
一、開發(fā)環(huán)境要求
XCode8以上,只有它之后的編譯器里才有Speech.framework
二、創(chuàng)建工程開發(fā)
1.導(dǎo)入Speech.framework【Build Phases->Link Binary With Libraries->+】
2.info.plist文件中添加
Privacy - Speech Recognition Usage Description
使用語音識別
Privacy - Microphone Usage Description
使用麥克風(fēng)
3.第一種：識別本地錄音
#import "ViewController.h"#import<Speech/Speech.h>
@interface ViewController ()<SFSpeechRecognitionTaskDelegate>
@property (nonatomic ,strong) SFSpeechRecognitionTask *recognitionTask;
@property (nonatomic ,strong) SFSpeechRecognizer? ? ? *speechRecognizer;
@property (nonatomic ,strong) UILabel? ? ? ? ? ? ? ? *recognizerLabel;
@end
@implementation ViewController
- (void)dealloc {
[self.recognitionTask cancel];
self.recognitionTask = nil;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
//0.0獲取權(quán)限
[SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status) {
switch (status) {
case SFSpeechRecognizerAuthorizationStatusNotDetermined:
break;
case SFSpeechRecognizerAuthorizationStatusDenied:
break;
case SFSpeechRecognizerAuthorizationStatusRestricted:
break;
case SFSpeechRecognizerAuthorizationStatusAuthorized:
break;
default:
break;
}
}];
//1.創(chuàng)建SFSpeechRecognizer識別實例
self.speechRecognizer = [[SFSpeechRecognizer alloc] initWithLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];//中文識別
//@"zh"在iOS9之后就不是簡體中文了，而是TW繁體中文
//? ? [SFSpeechRecognizer supportedLocales];//根據(jù)手機設(shè)置的語言識別
//? ? for (NSLocale *lacal in [SFSpeechRecognizer supportedLocales].allObjects) {
//? ? ? ? NSLog(@"countryCode:%@? languageCode:%@ ", lacal.countryCode, lacal.languageCode);
//? ? }
//2.創(chuàng)建識別請求
SFSpeechURLRecognitionRequest *request = [[SFSpeechURLRecognitionRequest alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"1122334455.mp3" ofType:nil]]];
//3.開始識別任務(wù)
self.recognitionTask = [self recognitionTaskWithRequest1:request];
}
- (SFSpeechRecognitionTask *)recognitionTaskWithRequest0:(SFSpeechURLRecognitionRequest *)request{
return [self.speechRecognizer recognitionTaskWithRequest:request resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) {
if (!error) {
NSLog(@"語音識別解析正確--%@", result.bestTranscription.formattedString);
}else {
NSLog(@"語音識別解析失敗--%@", error);
}
}];
}
- (SFSpeechRecognitionTask *)recognitionTaskWithRequest1:(SFSpeechURLRecognitionRequest *)request{
return [self.speechRecognizer recognitionTaskWithRequest:request delegate:self];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
#pragma mark- SFSpeechRecognitionTaskDelegate
- (void)speechRecognitionDidDetectSpeech:(SFSpeechRecognitionTask *)task
{
}
- (void)speechRecognitionTask:(SFSpeechRecognitionTask *)task didHypothesizeTranscription:(SFTranscription *)transcription {
}
- (void)speechRecognitionTask:(SFSpeechRecognitionTask *)task didFinishRecognition:(SFSpeechRecognitionResult *)recognitionResult {
NSDictionary *attributes = @{
NSFontAttributeName:[UIFont systemFontOfSize:18],
};
CGRect rect = [recognitionResult.bestTranscription.formattedString boundingRectWithSize:CGSizeMake(self.view.bounds.size.width - 100, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil];
self.recognizerLabel.text = recognitionResult.bestTranscription.formattedString;
self.recognizerLabel.frame = CGRectMake(50, 120, rect.size.width, rect.size.height);
}
- (void)speechRecognitionTaskFinishedReadingAudio:(SFSpeechRecognitionTask *)task {
}
- (void)speechRecognitionTaskWasCancelled:(SFSpeechRecognitionTask *)task {
}
- (void)speechRecognitionTask:(SFSpeechRecognitionTask *)task didFinishSuccessfully:(BOOL)successfully {
if (successfully) {
NSLog(@"全部解析完畢");
}
}
#pragma mark- getter
- (UILabel *)recognizerLabel {
if (!_recognizerLabel) {
_recognizerLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 120, self.view.bounds.size.width - 100, 100)];
_recognizerLabel.numberOfLines = 0;
_recognizerLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
_recognizerLabel.adjustsFontForContentSizeCategory = YES;
_recognizerLabel.textColor = [UIColor orangeColor];
[self.view addSubview:_recognizerLabel];
}
return _recognizerLabel;
}
@end
4.第二種:識別即時語音錄入
#import "ViewController.h"
#import <Speech/Speech.h>
@interface ViewController ()<SFSpeechRecognizerDelegate>
@property (nonatomic, strong) AVAudioEngine *audioEngine;? ? ? ? ? ? ? ? ? ? ? ? ? // 聲音處理器
@property (nonatomic, strong) SFSpeechRecognizer *speechRecognizer;? ? ? ? ? ? ? ? // 語音識別器
@property (nonatomic, strong) SFSpeechAudioBufferRecognitionRequest *speechRequest; // 語音請求對象
@property (nonatomic, strong) SFSpeechRecognitionTask *currentSpeechTask;? ? ? ? ? // 當(dāng)前語音識別進程
@property (nonatomic, strong) UILabel *showLb;? ? ? // 用于展現(xiàn)的label
@property (nonatomic, strong) UIButton *startBtn;? ? // 啟動按鈕
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// 初始化
self.audioEngine = [AVAudioEngine new];
// 這里需要先設(shè)置一個AVAudioEngine和一個語音識別的請求對象SFSpeechAudioBufferRecognitionRequest
self.speechRecognizer = [SFSpeechRecognizer new];
self.startBtn.enabled = NO;
[SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status)
{
if (status != SFSpeechRecognizerAuthorizationStatusAuthorized)
{
// 如果狀態(tài)不是已授權(quán)則return
return;
}
// 初始化語音處理器的輸入模式
[self.audioEngine.inputNode installTapOnBus:0 bufferSize:1024 format:[self.audioEngine.inputNode outputFormatForBus:0] block:^(AVAudioPCMBuffer * _Nonnull buffer,AVAudioTime * _Nonnull when)
{
// 為語音識別請求對象添加一個AudioPCMBuffer，來獲取聲音數(shù)據(jù)
[self.speechRequest appendAudioPCMBuffer:buffer];
}];
// 語音處理器準(zhǔn)備就緒（會為一些audioEngine啟動時所必須的資源開辟內(nèi)存）
[self.audioEngine prepare];
self.startBtn.enabled = YES;
}];
}
- (void)onStartBtnClicked
{
if (self.currentSpeechTask.state == SFSpeechRecognitionTaskStateRunning)
{? // 如果當(dāng)前進程狀態(tài)是進行中
[self.startBtn setTitle:@"開始錄制" forState:UIControlStateNormal];
// 停止語音識別
[self stopDictating];
}
else
{? // 進程狀態(tài)不在進行中
[self.startBtn setTitle:@"停止錄制" forState:UIControlStateNormal];
self.showLb.text = @"等待";
// 開啟語音識別
[self startDictating];
}
}
- (void)startDictating
{
NSError *error;
// 啟動聲音處理器
[self.audioEngine startAndReturnError: &error];
// 初始化
self.speechRequest = [SFSpeechAudioBufferRecognitionRequest new];
// 使用speechRequest請求進行識別
self.currentSpeechTask =
[self.speechRecognizer recognitionTaskWithRequest:self.speechRequest resultHandler:^(SFSpeechRecognitionResult * _Nullable result,NSError * _Nullable error)
{
// 識別結(jié)果，識別后的操作
if (result == NULL) return;
self.showLb.text = result.bestTranscription.formattedString;
}];
}
- (void)stopDictating
{
// 停止聲音處理器，停止語音識別請求進程
[self.audioEngine stop];
[self.speechRequest endAudio];
}
#pragma mark- getter
- (UILabel *)showLb {
if (!_showLb) {
_showLb = [[UILabel alloc] initWithFrame:CGRectMake(50, 180, self.view.bounds.size.width - 100, 100)];
_showLb.numberOfLines = 0;
_showLb.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
_showLb.text = @"等待中...";
_showLb.adjustsFontForContentSizeCategory = YES;
_showLb.textColor = [UIColor orangeColor];
[self.view addSubview:_showLb];
}
return _showLb;
}
- (UIButton *)startBtn {
if (!_startBtn) {
_startBtn = [UIButton buttonWithType:UIButtonTypeCustom];
_startBtn.frame = CGRectMake(50, 80, 80, 80);
[_startBtn addTarget:self action:@selector(onStartBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[_startBtn setBackgroundColor:[UIColor redColor]];
[_startBtn setTitle:@"錄音" forState:UIControlStateNormal];
[_startBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[self.view addSubview:_startBtn];
}
return _startBtn;
}
@end
5.引申【各國語言代碼】
6.知其然知其所以然
SpeechFramework框架中的重要類
SFSpeechRecognizer：這個類是語音識別的操作類，用于語音識別用戶權(quán)限的申請，語言環(huán)境的設(shè)置，語音模式的設(shè)置以及向Apple服務(wù)發(fā)送語音識別的請求。
SFSpeechRecognitionTask：這個類是語音識別服務(wù)請求任務(wù)類，每一個語音識別請求都可以抽象為一個SFSpeechRecognitionTask實例，其中SFSpeechRecognitionTaskDelegate協(xié)議中約定了許多請求任務(wù)過程中的監(jiān)聽方法。
SFSpeechRecognitionRequest:語音識別請求類，需要通過其子類來進行實例化。
SFSpeechURLRecognitionRequest：通過音頻URL來創(chuàng)建語音識別請求。
SFSpeechAudioBufferRecognitionRequest:通過音頻流來創(chuàng)建語音識別請求。
SFSpeechRecognitionResult：語音識別請求結(jié)果類。
SFTranscription：語音轉(zhuǎn)換后的信息類。
7.Demo地址
https://github.com/BeanMan/SpeechFramWork
參考文章:
http://www.lxweimin.com/p/c4de4ee2134d
http://www.lxweimin.com/p/487147605e08
站在巨人的肩膀上才有這些總結(jié)
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