IOS UIWebView load Loading implementation method

Method 1: use UIView and UIActivityIndicatorView

// create UIWebView

WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)];

[WebView setUserInteractionEnabled:NO];

[WebView setBackgroundColor:[UIColor clearColor]];

[WebView setDelegate:self];

[WebView setOpaque:NO];// Make web pages transparent 

NSString *path = @"http://www.baidu.com";

NSURL *url = [NSURL URLWithString:path];

[WebView loadRequest:[NSURLRequest requestWithURL:url]];

// create UIActivityIndicatorView Back base translucency View   

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

[view setTag:103];

[view setBackgroundColor:[UIColor blackColor]];

[view setAlpha:0.8];

[self.view addSubview:view];

activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];

[activityIndicator setCenter:view.center];

[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];

[view addSubview:activityIndicator];

[self.view addSubview:WebView];

[view release];

[WebView release];

// Start loading data 

- (void)webViewDidStartLoad:(UIWebView *)webView {   

      [activityIndicator startAnimating];        

}

// Data loaded 

- (void)webViewDidFinishLoad:(UIWebView *)webView {

     [activityIndicator stopAnimating];   

     UIView *view = (UIView *)[self.view viewWithTag:103];

     [view removeFromSuperview];

}

The second method: use UIAlertView and UIActivityIndicatorView

// Loading web animation 

- (void)webViewDidStartLoad:(UIWebView *)webView{

    if (myAlert==nil){       

       myAlert = [[UIAlertView alloc] initWithTitle:nil

                                                              message: @" In the reading ..."

                                                                delegate: self

                                                 cancelButtonTitle: nil

                                                 otherButtonTitles: nil]; 

     UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];

     activityView.frame = CGRectMake(120.f, 48.0f, 38.0f, 38.0f);

     [myAlert addSubview:activityView];

     [activityView startAnimating];

     [myAlert show];

     }

}

- (void)webViewDidFinishLoad:(UIWebView *)webView{

      [myAlert dismissWithClickedButtonIndex:0 animated:YES];

}

Method 3: use UIWebView to load gif images. Do not do this unless you are using webView

NSData *gif = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource:@"1" ofType:@"gif"]];  

// view generate   

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(100, 100, 70, 30)];  

webView.userInteractionEnabled = NO;// User non-interaction   

[webView loadData:gif MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];  

[self.view addSubview:webView];  

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