AVSpeechSynthesizer的问题，任何解决方法？ [英] An issue with AVSpeechSynthesizer, Any workarounds?

问题描述

我使用AVSpeechSynthesizer播放文本。我有一个发音阵列。

I am using AVSpeechSynthesizer to play text. I have an array of utterances to play.

    NSMutableArray *utterances = [[NSMutableArray alloc] init];
    for (NSString *text in textArray) {
        AVSpeechUtterance *welcome = [[AVSpeechUtterance alloc] initWithString:text];
        welcome.rate = 0.25;
        welcome.voice = voice;
        welcome.pitchMultiplier = 1.2;
        welcome.postUtteranceDelay = 0.25;
        [utterances addObject:welcome];
    }
    lastUtterance = [utterances lastObject];
    for (AVSpeechUtterance *utterance in utterances) {
        [speech speakUtterance:utterance];
    }

我有一个取消按钮可停止说话。当我说出第一个话语时点击取消按钮，语音停止，它清除队列中的所有话语。如果在说出第一话语（即第二话语）之后我按取消按钮，则停止话音不刷新话语队列。我使用的代码是：

I have a cancel button to stop speaking. When I click the cancel button when the first utterance is spoken, the speech stops and it clears all the utterances in the queue. If I press the cancel button after the first utterance is spoken (i.e. second utterance), then stopping the speech does not flush the utterances queue. The code that I am using for this is:

  [speech stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];

有人可以确认这是API中的错误还是我使用API​​不正确？如果是错误，是否有解决这个问题的解决方法？

Can someone confirm if this is a bug in the API or am I using the API incorrectly? If it is a bug, is there any workaround to resolve this issue?

推荐答案

很可能是一个错误，委托方法合成器didCancelSpeechUtterance 在第一个语句后不被调用;

quite likely to be a bug, in that the delegate method synthesizer didCancelSpeechUtterance isn't called after the first utterance;

一个解决方法是链接语句，而不是将它们放在数组并立即排队。

A workaround would be to chain the utterances rather than have them in an array and queue them up at once.

使用代理方法 synthesizer didFinishSpeechUtterance 增加数组指针，并从该数组中下一个文本。然后，当试图停止语音时，在尝试说出下一个文本之前，设置在此委托方法中检查的BOOL。

Use the delegate method synthesizer didFinishSpeechUtterance to increment an array pointer and speak the the next text from that array. Then when trying to stop the speech, set a BOOL that is checked in this delegate method before attempting to speak the next text.

例如：

1）在执行语音合成的视图控制器中实现协议

1) implement the protocol in the view controller that is doing the speech synthesis

#import <UIKit/UIKit.h>
@import AVFoundation;
@interface ViewController : UIViewController <AVSpeechSynthesizerDelegate>

@end

2）实例化AVSpeechSynthesizer并将其委托设置为self

2) instantiate the AVSpeechSynthesizer and set its delegate to self

speechSynthesizer   = [AVSpeechSynthesizer new];
speechSynthesizer.delegate = self;

3）使用发音计数器，在发言开始时设置为零

3) use an utterance counter, set to zero at start of speaking

4）使用文本数组说话

4) use an array of texts to speak

textArray           = @[@"Mary had a little lamb, its fleece",
                        @"was white as snow",
                        @"and everywhere that Mary went",
                        @"that sheep was sure to go"];

5）添加委托方法didFinishSpeechUtterance从数组中说出下一个语句
增加语音计数器

5) add delegate method didFinishSpeechUtterance to speak the next utterance from the array of texts and increment the utterance counter

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance{
    if(utteranceCounter < utterances.count){
        AVSpeechUtterance *utterance = utterances[utteranceCounter];
        [synthesizer speakUtterance:utterance];
        utteranceCounter++;
    }
}

5）停止说话，将发声计数器设置为

5) to stop speaking, set the utterance counter to the count of the texts array and attempt to get the synthesizer to stop

utteranceCounter = utterances.count;

BOOL speechStopped =  [speechSynthesizer stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
if(!speechStopped){
    [speechSynthesizer stopSpeakingAtBoundary:AVSpeechBoundaryWord];
}

6）再次发言时，将发声计数器重置为零

6) when speaking again, reset the utterance counter to zero

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