How to access Meta Data of a HTML pag开发者_JAVA百科e loaded into a UIWebView in iOS?
You can access the meta tag's content by,
NSString *graphURL = [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByName('facebook_share')
[0].getAttribute('content')"];
where you can change the attribute name declared in 'content'
To extract the author in
<html><head>
<meta name="Author" content="Bloody Mary">
</head><body></body></html>
wrap the javascript in a function, save it as file reportMeta.js and add it to your project.
// file reportMeta.js
function reportMeta(){
alert(document.getElementsByName('author')[0].getAttribute('content'));
}
Then load the file from webViewDidFinishLoad: and execute it:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *path = [[NSBundle mainBundle] pathForResource:@"reportMeta" ofType:@"js"];
NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
[webView stringByEvaluatingJavaScriptFromString:jsCode];
[webView stringByEvaluatingJavaScriptFromString:@"reportMeta()"];
}
Or, if your JS is short you can just inline it inside Objective-C.
By injecting javascript calls -
var metas = document.getElementsByTagName('META');
var i;
for (i = 0; i < metas.length; i++)
{
...
}
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
加载中,请稍侯......
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