Question

我正在obj-c中制作一个ios应用程序，我想要给我发电子邮件。但该应用程序在此行崩溃：[synthesizer speakUtterance:utterance];

这是说出电子邮件的方法：

-(void) speakEmails {
    NSString *currentEmail = [summariesList objectAtIndex:0];
    NSLog(@"Email Being Spoken: %@", currentEmail);

    AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:currentEmail];
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];

    AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc]init];
    [synthesizer speakUtterance:utterance];
}

这就是NSString currentEmail：

 Email Being Spoken: {
    date = Today;
    sender = "tony@starkindustries.com";
    summary = "Blah Blah Blah Blah";
    type = regular;
}

我一直收到错误-[__NSCFDictionary length]: unrecognized selector sent to instance 0x16528b30。我不知道为什么会这样。任何帮助表示赞赏。

Answer 1

您将currentEmail设置为字典（解析的JSON）而不是字符串。试试这个：

NSString *currentEmail = [[summariesList objectAtIndex:0] objectForKey:@"sender"];

为了确保将来不会发生这种情况，您可以像这样快速检查：

-(void) speakEmails {
    NSString *currentEmail = [summariesList objectAtIndex:0];
    NSLog(@"Email Being Spoken: %@", currentEmail);

    if (currentEmail != nil)
    {
        AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:currentEmail];
        utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];

        AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc]init];

        [synthesizer speakUtterance:utterance];
    }
}

iOS 7文本到语音崩溃

1 个答案: