OS7 的這個功能確實不錯。我剛試了下，用官方提供的API ，簡單的幾句代碼就能實現文本轉語音！

Xcode 5.0

工程建好後首先把AVFoundation.framework 加入到工程

 

 

 AVSpeechSynthesizer *av = [[AVSpeechSynthesizer alloc]init];
AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc]initWithString:@"Hello qingjoin"]; //需要轉換的文本
[av speakUtterance:utterance];
//以上三行代碼就可以搞定文本轉語音   有API就是省事。哈哈
/*******************************************************/
//具體可參考以下demo   記得.h文件裡別忘記了這個哦
#import <AVFoundation/AVSpeechSynthesis.h>

//
//  ViewController.m
//  AVideoSpeechDemo
//
//  Created by qingyun on 6/28/13.
//  Copyright (c) 2013 qingyun. All rights reserved.
//
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];
_textS.delegate = self;
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (IBAction)textToSpeechBtnPress:(id)sender
{
AVSpeechSynthesizer *av = [[AVSpeechSynthesizer alloc]init];
AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc]initWithString:_textS.text];  //需要轉換的文本
[av speakUtterance:utterance];
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}

@end
2013-06-28 14:54:07.817 AVideoSpeechDemo[5468:60b] Enqueue: <AXSpeechAction: 0x166d9820> hello :Pitch 1.000000 : Language: (null)

2013-06-28 14:54:22.791 AVideoSpeechDemo[5468:60b] Enqueue: <AXSpeechAction: 0x166f94f0> hello， qingjoin :Pitch 1.000000 : Language: (null)

2013-06-28 15:06:42.424 AVideoSpeechDemo[5468:60b] Enqueue: <AXSpeechAction: 0x166f3af0> 你好，我是qingjoin ! hello :Pitch 1.000000 : Language: (null)