NSSpeechSynthesizer更改語言

Question

我正在編寫一個簡單的程序，該程序基於使用NSSpeechSynthesizer講短語的Cocoa Book的示例。我想知道如何更改用於合成階段的語言。

#import "PHAppDelegate.h" 

@implementation PHAppDelegate 

@synthesize window = _window; 
@synthesize textField = _textField; 

- (id)init{ 

    self = [super init]; 

    if(self){ 

     NSLog(@"init"); 

     _speechSynth = [[NSSpeechSynthesizer alloc] initWithVoice:nil]; 

    } 

     return self; 

} 

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{ 
    // Insert code here to initialize your application 
} 

- (IBAction)stopIt:(id)sender { 

    NSLog(@"stoppping"); 
    [_speechSynth stopSpeaking]; 

} 

- (IBAction)sayit:(id)sender { 

    NSString *string = [_textField stringValue]; 

    if([string length] == 0){ 

     NSLog(@"There is no text to speech."); 

     return; 
    } 

    NSString *voiceID =[[NSSpeechSynthesizer availableVoices] objectAtIndex:10]; 

    [_speechSynth setVoice:voiceID]; 

    [_speechSynth startSpeakingString:string]; 


    NSLog(@"Have started to say: %@", string); 


} 
@end 

此代碼正常工作。

Answer 1

this 2014 document表示只有一種語言可用（美國英語）。

NSVoiceLanguage 
The language of the voice (currently US English only). An NSString Deprecated: Use NSVoiceLocaleIdentifier (page 24) instead. Available in OS X v10.0 and later. 
Deprecated in OS X v10.5. 
Declared in NSSpeechSynthesizer.h. 

Answer 2

for (NSString *voiceIdentifierString in [NSSpeechSynthesizer availableVoices]) { 
    NSString *voiceLocaleIdentifier = [[NSSpeechSynthesizer attributesForVoice:voiceIdentifierString] objectForKey:NSVoiceLocaleIdentifier]; 
    NSLog(@"%@ speaks %@", voiceIdentifierString, voiceLocaleIdentifier); 

}

見Voice Attributes Keys