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];