你如何开始活动指标？

Question

我想在用户按下webview上的任何链接时启动活动指示器.

Answer 1

首先将UIWebView出现的ViewController指定为其委托:通过从UIWebView控件拖动到InterfaceBuilder中的File的Owner对象或代码中来执行此操作:

[myWebView setDelegate:myViewController];

然后在ViewController.m文件中,您现在可以使用委托方法来检测何时加载页面.每次在UIWebView中加载链接或新页面时,都会触发这些委托方法.

- (void)webViewDidStartLoad:(UIWebView *)webView {
     [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
     [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
     [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}