我有一个 UIWebView 并且一个页面有一个 AJAX 组件，当用户单击按钮时，它的内容会发生变化.我如何知道内容何时加载到 UIWebView 中?
I have a UIWebView and one page has an AJAX component whose content changes when the user clicks a button. How can I know when the content has loaded inside the UIWebView?
你需要做两件事:
在您的 JavaScript 代码中，使用 XMLHTTPRequest 信号表明 AJAX 请求已通过自定义 URL 完成:
In your JavaScript code, have the XMLHTTPRequest signal that the AJAX request is complete with a custom URL:
var req = new XMLHttpRequest();
req.open('GET', 'http://www.mozilla.org/', true);
req.onreadystatechange = function (aEvt) {
if (req.readyState == 4) {
if(req.status == 200) {
window.location = "myspecialurl:foo"
}
}
};
在您的本机代码中，您需要实现一个 UIWebView 委托来侦听此自定义 URL:
In your native code, you'll need to implement a UIWebView delegate that listens for this custom URL:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
if([[[request URL] absoluteString] isEqualToString:@"myspecialurl:foo"]) {
// Your code for when the AJAX request completes.
return NO;
}
return YES;
}
不保证此代码可以解析/编译，但应该让您知道如何去做.
No assurances this code parses/compiles but should give you the idea how to do it.
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