iOS 7文字轉語音崩潰

Question

我正在obj-c中制作一個ios應用程序，我想向我發送電子郵件。 但是應用程序在此行崩潰： [synthesizer speakUtterance:utterance];

這是說電子郵件的方法：

-(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];
}

這是NSString currentEmail是：

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

我不斷收到錯誤-[__NSCFDictionary length]: unrecognized selector sent to instance 0x16528b30 。 我不知道為什么會這樣。 任何幫助表示贊賞。

Answer 1

您正在將currentEmail設置為字典（解析的JSON）而不是字符串。 嘗試以下方法：

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

為了確保將來不會發生這種情況，您可以像這樣進行快速檢查：

-(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];
    }
}