iOS10原生的語音轉文字功能

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#import <Foundation/Foundation.h>#import <Speech/Speech.h>@interface SpeechListener : NSObject<SFSpeechRecognitionTaskDelegate,SFSpeechRecognizerDelegate>@property(nonatomic,strong)SFSpeechRecognizer *listener;@property(nonatomic,strong)SFSpeechRecognitionTask *currentTask;@property(nonatomic,assign)SFSpeechRecognizerAuthorizationStatus authorizationStatus;@property(nonatomic,strong)SFSpeechAudioBufferRecognitionRequest *currentRequest;@property(nonatomic,assign)BOOL inRecognizer;@property(nonatomic,copy)void (^haveRecognizerSpeakTextBlock)(NSString *text,NSTimeInterval startLocation,NSTimeInterval length);-(void)startRecognizer;-(void)giveBuffer:(CMSampleBufferRef)buffer;-(void)endRecognizer;@end

#import "SpeechListener.h"@interface SpeechListener()@property(nonatomic,copy)NSString *currentText;@property(nonatomic,assign)NSTimeInterval beginListenLocation;@end@implementation SpeechListener-(instancetype)init{    self = [super init];    if (self) {        self.listener = [[SFSpeechRecognizer alloc] initWithLocale:[NSLocale localeWithLocaleIdentifier:@"zh-CN"]];        [self.listener setDelegate:self];        [self requestAuthorizationStatus];    }    return self;}-(void)requestAuthorizationStatus{    typeof(self) __weak weakself = self;    [SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status) {        typeof(weakself) __strong strongself = weakself;        strongself.authorizationStatus = status;    }];}-(void)startRecognizer{    self.beginListenLocation = CFAbsoluteTimeGetCurrent();    self.currentRequest = [[SFSpeechAudioBufferRecognitionRequest alloc] init];    [self.currentRequest setShouldReportPartialResults:YES];    typeof(self) __weak weakself = self;    self.currentTask = [self.listener recognitionTaskWithRequest:self.currentRequest resultHandler:^(SFSpeechRecognitionResult *result, NSError *error) {        typeof(weakself) __strong strongself = weakself;        if (strongself.inRecognizer) {            if (error != nil) {                [strongself endRecognizer];            }            else                if(result != nil) {                if (strongself.inRecognizer) {                    strongself.currentText = [[result bestTranscription] formattedString];                }                if ([result isFinal]) {                    [strongself endRecognizer];                }            }        }        if (error) {        }    }];    self.inRecognizer = YES;}-(void)endRecognizer{    if (self.currentText.length > 0) {        if (self.haveRecognizerSpeakTextBlock) {            self.haveRecognizerSpeakTextBlock(self.currentText, self.beginListenLocation, CFAbsoluteTimeGetCurrent() - self.beginListenLocation);        }    }        self.inRecognizer = NO;    if (self.currentTask) {        [self.currentTask cancel];        self.currentTask = nil;    }    if (self.currentRequest) {        [self.currentRequest endAudio];        self.currentRequest = nil;    }    self.currentText = @"";}-(void)speechRecognizer:(SFSpeechRecognizer *)speechRecognizer availabilityDidChange:(BOOL)available{    self.inRecognizer = !available;}-(void)giveBuffer:(CMSampleBufferRef)buffer{    if (self.currentRequest) {        [self.currentRequest appendAudioSampleBuffer:buffer];    }    if (self.inRecognizer && (CFAbsoluteTimeGetCurrent() - self.beginListenLocation) > 30) {        [self endRecognizer];        [self startRecognizer];    }}@end

 

iOS10原生的語音轉文字功能