在Xcode9中,创建一个项目,导入Siri的库speech
#import <Speech/Speech.h>
1.1 创建一个项目,导入speech库
1.2 在viewdidload中开始实例化需要的属性
1.2.1 首先需要判断用户是否支持siri使用和录音权限
1.2.2 实例化语音识别器并实现代理方法
//语音识别器的代理方法
- (void)speechRecognizer:(SFSpeechRecognizer *)speechRecognizer availabilityDidChange:(BOOL)available {
if (available) {
self.siriButton.enabled = YES;
}else{
self.siriButton.enabled = NO;
}
}
1.2.3 实例化语音引擎,因为需要出发点击我在这里创建了一个button和一个展示录音转文字以后的textField
self.audioEngine = [AVAudioEngine new];
// 按钮触发开始录音
[self.siriButton addBlockForControlEvents:UIControlEventTouchUpInside block:^(id _Nonnull sender) {
//判断语音引擎是不是在执行中,如果在则停止引擎
if ([self.audioEngine isRunning]) {
[self.audioEngine stop];
[self.recognitionRequest endAudio];
self.recognitionRequest = nil;
self.audioEngine = nil;
[self.siriButton setTitle:@"开始录制" forState:UIControlStateNormal];
}else{
[self.siriButton setTitle:@"停止录制" forState:UIControlStateNormal];
//如果存在任务
if (self.recognitionTask) {
[self.recognitionTask cancel];
self.recognitionTask = nil;
}
/// 一个会话任务
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
bool audioBool = [audioSession setCategory:AVAudioSessionCategoryRecord error:nil];
bool audioBool1= [audioSession setMode:AVAudioSessionModeMeasurement error:nil];
bool audioBool2= [audioSession setActive:true withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];
if (audioBool || audioBool1|| audioBool2) {
NSLog(@"可以使用");
}else{
NSLog(@"这里说明有的功能不支持");
}
///录音请求
self.recognitionRequest = [[SFSpeechAudioBufferRecognitionRequest alloc]init];
self.recognitionRequest.shouldReportPartialResults = YES;
// 语音识别任务
self.recognitionTask = [self.recognizer recognitionTaskWithRequest:self.recognitionRequest resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) {
bool isFinal = false;
if (result) {
self.textPages.text = [[result bestTranscription] formattedString]; //语音转文本
isFinal = [result isFinal];
}
if (error || isFinal) {
[self.audioEngine stop];
[self.audioEngine.inputNode removeTapOnBus:0];
self.recognitionRequest = nil;
self.recognitionTask = nil;
self.siriButton.enabled = true;
}
}];
// 拼接录音buffer
AVAudioFormat *recordingFormat = [self.audioEngine.inputNode outputFormatForBus:0];
[self.audioEngine.inputNode installTapOnBus:0 bufferSize:1024 format:recordingFormat block:^(AVAudioPCMBuffer * _Nonnull buffer, AVAudioTime * _Nonnull when) {
[self.recognitionRequest appendAudioPCMBuffer:buffer];
}];
[self.audioEngine prepare];
bool audioEngineBool = [self.audioEngine startAndReturnError:nil];
NSLog(@"%d",audioEngineBool);
}
}];
1.3 需要在plist添加属性,用户允许使用siri
1.4 运行在手机上,就可以录音转文字了
1.4.1 效果如下
