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

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本文介绍在iOS应用中为UIWebView加载网页时显示Loading动画的两种方法。第一种方法通过添加UIActivityIndicatorView到背景透明视图实现；第二种方法是在UIAlertView上添加UIActivityIndicatorView来显示加载提示。

【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];
}