iphone之打开pdf、doc、xls文件用UIWebView

//文件名字及类型    NSString *path=[[NSBundle mainBundle]pathForResource:@"xls1" ofType:@"xls"];    //获取内容    NSData *data = [[NSData alloc]initWithContentsOfFile:path];    NSString *string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];    NSLog(@"%@",string);        UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 55, 320, 300)];    webView.delegate = self;    webView.multipleTouchEnabled = YES;    webView.scalesPageToFit = YES;        NSURL *url = [NSURL fileURLWithPath:path];    NSURLRequest *request = [NSURLRequest requestWithURL:url];    [webView loadRequest:request];        [self.view addSubview:webView];