iOS语音合成

苹果公司在iOS7中推出了语音合成的技术，无需网络环境也可以实现语音合成。

iOS7语音合成的主要的API如下：

1、AVSpeechUtterance，是语音合成的基本单位，它封装影响语音合成的需要的一些参数：语音、语调、语速和延迟等。

2、AVSpeechSynthesisVoice，是语音合成中的Voice对象，它主要包括语音和地区两个方面。

3、AVSpeechSynthesizer，语音合成器的管理类，通过speakUtterance:方法管理AVSpeechSynthesizer。

4、AVSpeechSynthesizerDelegate，是AVSpeechSynthesizer的委托协议。

代码如下：

#import "DemoVC36.h"

#import

@interface DemoVC36 ()@property (weak, nonatomic) IBOutlet UITextView *textView;

@property (weak, nonatomic) IBOutlet UISlider *slider;

@property (nonatomic, strong) AVSpeechSynthesizer *speechSynthesizer;

@end

@implementation DemoVC36

- (void)viewDidLoad {

[super viewDidLoad];

//为TextView

[self.textView.layer setBorderWidth:0.5f];

[self.textView.layer setBorderColor:[UIColor grayColor].CGColor];

[self.textView setDelegate:self];

self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];

self.speechSynthesizer.delegate = self;

}

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

BOOL retval = TRUE;

if ([text isEqualToString:@"\n"]) {

[self.textView resignFirstResponder];

retval = FALSE;

}

return retval;

}

- (IBAction)speakButtonWasPressed:(UIButton *)sender {

NSString *str = @"wei fang is a handsome man";

AVSpeechUtterance *utt = [AVSpeechUtterance speechUtteranceWithString:str];

utt.rate = [self.slider value];

[self.speechSynthesizer speakUtterance:utt];

}

- (IBAction)speechSpeedShouldChange:(id)sender {

UISlider *slider = (UISlider *)sender;

NSInteger val = round(slider.value);

NSLog(@"%@",[NSString stringWithFormat:@"%ld",val]);

}

#pragma mark--AVSpeechSynthesizerDelegate

-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didStartSpeechUtterance:(AVSpeechUtterance *)utterance{

NSLog(@"语音合成开始");

}

-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance{

NSLog(@"语音合成完成");

}

@end