1

我是 iPhone 开发者的新手，

我正在我的 webview 中加载页面，加载需要太多时间，所以我想显示ActivityIndicator直到页面加载，

这是我的代码片段，但它不起作用，

activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    activityIndicator.frame = CGRectMake(200.0, 200.0, 100.0, 40.0);
    activityIndicator.center = self.view.center;
    [self.view addSubview: activityIndicator];

    _webview=[[UIWebView alloc]init];
    [_webview setBackgroundColor:[UIColor grayColor]];
    [_webview setDelegate:(id<UIWebViewDelegate>)self];
    [self.view addSubview:_webview];

    [_webview bringSubviewToFront:activityIndicator];

...

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

     [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

     [activityIndicator startAnimating];
     activityIndicator.hidden=FALSE;
 }

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

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    [activityIndicator stopAnimating];
    activityIndicator.hidden=TRUE;
}

但我看不到我的activityIndicator

任何帮助将不胜感激。

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3 回答 3

3

您正在将UIActivityIndicatorView直接添加到 ，self.view然后您尝试bringSubviewToFront从UIWebView. 检查：

[self.view bringSubviewToFront:activityIndicator];
于 2012-07-05T06:44:22.230 回答
1

更改 [_webview bringSubviewToFront:activityIndicator];为 [self.view bringSubviewToFront:activityIndicator];

于 2012-07-05T06:43:21.030 回答
1

您还可以更改添加子视图的顺序。先添加webview，再添加activity indicator：

_webview=[[UIWebView alloc]init];
[_webview setBackgroundColor:[UIColor grayColor]];
[_webview setDelegate:(id<UIWebViewDelegate>)self];
[self.view addSubview:_webview];

activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activityIndicator.frame = CGRectMake(200.0, 200.0, 100.0, 40.0);//you should also keep the height and width equal
activityIndicator.center = self.view.center;
[self.view addSubview: activityIndicator];

并摆脱以下行：[_webview bringSubviewToFront:activityIndicator];

于 2012-07-05T06:46:21.560 回答