ios webView 加载本地html5

UIWebView *webView=[[UIWebView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
[self.view addSubview:webView];

NSString *filePath = [[NSBundle mainBundle]pathForResource:@"ios_long" ofType:@"html"];
NSString *htmlString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
[webView loadHTMLString:htmlString baseURL:[NSURL URLWithString:filePath]];