Can UIWebView can load and display a HTML from a local file at iPhone?
Yes, It can working in my test case.

test case 1, loading a resroutce file. failed

NSString *pdfPath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];
NSURL *url = [NSURL URLWithString:pdfPath];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
[myWebView loadRequest:urlRequest];

test case 2, loading a recource file. Working

NSString *pdfPath2 = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];
NSURL *pdfURL = [NSURL fileURLWithPath:pdfPath2];
NSURLRequest *URLReq = [NSURLRequest requestWithURL:pdfURL];
[myWebView loadRequest:URLReq];