iOS How to request HTML page with "Loading..."

<div id="Tables"><div class="load_data"><span>読み込み中</span></div></div>

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse

	NSURL *url = [NSURL URLWithString:[self prefixForURLString:_htmlUrl.text]];
	NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
	_connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    _htmlData = [[NSMutableData alloc] initWithData:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    [_htmlData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSLog(@"");
    
    NSString *error_str = [error localizedDescription];
    UIAlertView *alertView = [[UIAlertView alloc]
                              initWithTitle:@"RequestError"
                              message:error_str
                              delegate:nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
    [alertView show];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSString *htmlString = [[NSString alloc]
                    initWithData:_htmlData
                    encoding:NSUTF8StringEncoding;
    
    [_htmlSource loadHTMLString:htmlString baseURL:nil];
}

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse
{
    if (redirectResponse) {
        NSMutableURLRequest *r = [request mutableCopy]; // original request
        [r setURL: [request URL]];
        return r;
    }
    else {
        return request;
    }
}