如何在iPhone中使用水平滑动逐页显示PDF？

 UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake( 0, 0, 320, 480 )];
 NSString *path = [[NSBundle mainBundle] pathForResource:@\"about\" ofType:@\"pdf\"];
 NSURL *targetURL = [NSURL fileURLWithPath:path];
 NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
 [webView loadRequest:request];
 webView.scalesPageToFit = YES;
 [self.view addSubview:webView];
 [webView release];