第一種方法：使用UIView and UIActivityIndicatorView

1. //創(chuàng)建UIWebView   
2. WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)];   
3. [WebView setUserInteractionEnabled:NO];   
4. [WebView setBackgroundColor:[UIColor clearColor]];   
5. [WebView setDelegate:self];   
6. [WebView setOpaque:NO];//使網(wǎng)頁透明   
7.     
8. NSString *path = @"http://www.baidu.com";   
9. NSURL *url = [NSURL URLWithString:path];   
10. [WebView loadRequest:[NSURLRequest requestWithURL:url]];   
11.         
12. //創(chuàng)建UIActivityIndicatorView背底半透明View      
13. UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];   
14. [view setTag:103];   
15. [view setBackgroundColor:[UIColor blackColor]];   
16. [view setAlpha:0.8];   
17. [self.view addSubview:view];   
18.     
19. activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];   
20. [activityIndicator setCenter:view.center];   
21. [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];   
22. [view addSubview:activityIndicator];   
23. [self.view addSubview:WebView];   
24. [view release];   
25. [WebView release];   
26.     
27. //開始加載數(shù)據(jù)   
28. - (void)webViewDidStartLoad:(UIWebView *)webView {      
29.       [activityIndicator startAnimating];           
30. }   
31.     
32. //數(shù)據(jù)加載完   
33. - (void)webViewDidFinishLoad:(UIWebView *)webView {   
34.      [activityIndicator stopAnimating];      
35.      UIView *view = (UIView *)[self.view viewWithTag:103];   
36.      [view removeFromSuperview];   
37. }  

第二種方法：使用UIAlertView and UIActivityIndicatorView

1. //加載網(wǎng)頁動(dòng)畫   
2. - (void)webViewDidStartLoad:(UIWebView *)webView{   
3.     if (myAlert==nil){          
4.        myAlert = [[UIAlertView alloc] initWithTitle:nil   
5.                                                               message: @"數(shù)據(jù)加載中..."  
6.                                                                 delegate: self   
7.                                                  cancelButtonTitle: nil   
8.                                                  otherButtonTitles: nil];   
9.         
10.      UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];   
11.      activityView.frame = CGRectMake(120.f, 48.0f, 37.0f, 37.0f);   
12.      [myAlert addSubview:activityView];   
13.      [activityView startAnimating];   
14.      [myAlert show];   
15.      }   
16. }   
17.     
18. - (void)webViewDidFinishLoad:(UIWebView *)webView{   
19.       [myAlert dismissWithClickedButtonIndex:0 animated:YES];   
20. }