【转】在webview加加载数据时添加一个Loading...动画的两种方法

【转】在webview加加载数据时添加一个Loading...动画的两种方法

 

大家使用iPhone/iPod浏览网页时，一定见过浏览器加载网页时，总会出现一个Loading动画，其实这是实现起来是非常简单的。下面就是两种不同的实现方法： 第一种方法： //创建UIWebView   WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)]; [WebView setUserInteractionEnabled:NO]; [WebView setBackgroundColor:[UIColor clearColor]];   [WebView setDelegate:self];   [WebView setOpaque:NO];//使网页透明   NSString *path = @"http://www.baidu.com";   NSURL *url = [NSURL URLWithString:path];   [WebView loadRequest:[NSURLRequest requestWithURL:url]]; //创建UIActivityIndicatorView背底半透明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];   //以下两个方法是UIWebView的delegate methods //开始加载数据 - (void)webViewDidStartLoad:(UIWebView *)webView {       [activityIndicator startAnimating];   } //数据加载完   - (void)webViewDidFinishLoad:(UIWebView *)webView {        [activityIndicator stopAnimating];        UIView *view = (UIView *)[self.view viewWithTag:103];        [view removeFromSuperview]; } 第二种方法：在UIAlertView上添加一个UIActivityIndicatorView //加载网页动画 - (void)webViewDidStartLoad:(UIWebView *)webView{     if (myAlert==nil){        myAlert = [[UIAlertView alloc] initWithTitle:nil                                                               message: @"正在加载数据，请稍候..."                                                                 delegate: self                                                    cancelButtonTitle: nil f                                                  otherButtonTitles: nil];      UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];      activityView.frame = CGRectMake(120.f, 48.0f, 37.0f, 37.0f);        [myAlert addSubview:activityView];      [activityView startAnimating];      [myAlert show]; } } - (void)webViewDidFinishLoad:(UIWebView *)webView{         [myAlert dismissWithClickedButtonIndex:0 animated:YES]; }