汉字转拼音

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NSString *hanziText = @"我是中国人";  if ([hanziText length]) {      NSMutableString *ms = [[NSMutableString alloc] initWithString:hanziText];      if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformMandarinLatin, NO)) {          NSLog(@"pinyin: %@", ms);      }      if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO)) {          NSLog(@"pinyin: %@", ms);      }  }