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我正在使用 iSpeech API。我在他们的论坛上发过帖子，但那里没有太多活动。我可以传递一个字符串并让应用程序说出它。但是现在我想传入一个字符串数组，比如 5。我希望引擎一个接一个地说出这些字符串，但它只说出第一个字符串。我决定使用 NSOperationQueue 所以在我的 viewDidLoad 中我做了：

//Create Queue
    queue = [[NSOperationQueue alloc] init];
    [queue setMaxConcurrentOperationCount:1];

然后我这样做：

  • (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    //Set loop for 5 strings
[self fetchStringsToSpeak:indexPath];

    }

    -(void)fetchStringsToSpeak:(NSIndexPath*)indexPath{

    int stringsToSpeak = 5;

for (int counter = 0; counter < stringsToSpeak; counter++) {

    //Get the string
    NSDictionary *currentString = [self.stringsArray objectAtIndex:indexPath.row+counter];

    //3. Fill im text and image for cell
    NSString *string = [currentString objectForKey:@"text"];

    //Clean the string from URLs
    NSError *error;
    NSDataDetector *linkDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error];
    NSArray *matches = [linkDetector matchesInString:string options:0 range:NSMakeRange(0, [string length])];
    NSLog(@"matches %@", matches);

    if ([matches count] > 0) {
        for (NSTextCheckingResult *match in matches) {
            if ([match resultType] == NSTextCheckingTypeLink) {
                NSString *linkToRemove = [[match URL] absoluteString];
                self.cleanString = [string stringByReplacingOccurrencesOfString:linkToRemove withString:@""];
                NSLog(@"Clean string: %@", self.cleanString);

            }
        }
    } else {
        NSLog(@"NO LINK");
        self.cleanString = string;
    } //END IF/ELSE

NSInvocationOperation *operation = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(speakAString:) object:self.cleanString];
[queue addOperation:operation];

//Message back to the main thread
[self performSelectorOnMainThread:@selector(taDah) withObject:nil waitUntilDone:YES];

} //END FOR LOOP

    }

    • (void)speakAString:(NSString*)stringToSpeak { ISSpeechSynthesis *synthesis = [[ISSpeechSynthesis alloc] initWithText:stringToSpeak]; NSError *错误；if(![synthesis speak:&err]) { NSLog(@"ERROR: %@", err); } self.cleanString = nil; }

它通过以下方法传递值：

它说的是第一个，但后来我明白了：

" Domain=com.ispeech.ispeechsdk.ErrorDomain Code=303 "SDK 已经在执行合成或识别。等待完成后再开始另一个请求。" UserInfo=0xb54f2b0 {NSLocalizedDescription=SDK 已经在执行合成或识别。在开始另一个请求之前等待它完成。}

为什么操作队列不等待？

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