UIWebView加载Loading...两种方法

来源：互联网发布：ubuntu启动anaconda 编辑：程序博客网时间：2024/06/05 07:20

第一种方法：使用UIView and UIActivityIndicatorView

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//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 = [NSURLURLWithString:path];
[WebView loadRequest:[NSURLRequestrequestWithURL: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];
 
//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：使用UIAlertView and UIActivityIndicatorView

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//加载网页动画
- (void)webViewDidStartLoad:(UIWebView *)webView{
    if(myAlert==nil){       
       myAlert = [[UIAlertView alloc] initWithTitle:nil
                                                              message: @"正在讀取網路資料"
                                                                delegate:self
                                                 cancelButtonTitle:nil
                                                 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];
}