Is there a way to extract the data from a UIWebView?

Question

Is there a way to extract the data from a UIWebView?

Is there a way to extract the first paragraph of each page from a UIWebView? I'm currently struggling with this task.

I've tried using a regular expression for detection, but unfortunately it's returning the paragraph class name instead of the actual content:

NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(<p\\s[\\
    S]*?=\\s*?['\"](.*?)['\"][\\s\\S]*?>)+?"
                             options:NSRegularExpressionCaseInsensitive
                             error:&error];

[regex enumerateMatchesInString:html
                        options:0
                        range:NSMakeRange(0, [html length])
                        usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL 
    *stop) {

    NSString *img = [html substringWithRange:[result rangeAtIndex:2]];
    NSLog(@"img src %@",img);
}];

NSString *classs=[webView stringByEvaluatingJavaScriptFromString:"document.getElementbyClassName(img)"];

javascript ios xcode uiwebview nsstring

Answer 1

Answer №1

To efficiently achieve this, you can use JavaScript code within the web view to locate and extract the text content of the first paragraph element in the document. This can be done using the

stringByEvaluatingJavaScriptFromString

method of UIWebView.

The following code snippet demonstrates how you can retrieve an array of all elements in the document with the tag name 'P'. It then verifies if there is at least one paragraph element present, returning its text content if so. Otherwise, it returns an empty string.

- (void)webViewDidFinishLoad:(UIWebView *)_webView
{
    NSString *code = @"var paragraphs = document.getElementsByTagName('P');"
                      "paragraphs.length > 0 ? paragraphs[0].innerText : '';";
    NSString *text = [_webView stringByEvaluatingJavaScriptFromString: code];
    // ... implement further actions with the extracted text ...
}

If necessary, you have the flexibility to run additional JavaScript code within the web view to inspect or alter other parts of the document.

Answer 2

To efficiently achieve this, you can use JavaScript code within the web view to locate and extract the text content of the first paragraph element in the document. This can be done using the

stringByEvaluatingJavaScriptFromString

method of UIWebView.

The following code snippet demonstrates how you can retrieve an array of all elements in the document with the tag name 'P'. It then verifies if there is at least one paragraph element present, returning its text content if so. Otherwise, it returns an empty string.

- (void)webViewDidFinishLoad:(UIWebView *)_webView
{
    NSString *code = @"var paragraphs = document.getElementsByTagName('P');"
                      "paragraphs.length > 0 ? paragraphs[0].innerText : '';";
    NSString *text = [_webView stringByEvaluatingJavaScriptFromString: code];
    // ... implement further actions with the extracted text ...
}

If necessary, you have the flexibility to run additional JavaScript code within the web view to inspect or alter other parts of the document.

Is there a way to extract the data from a UIWebView?

Answer №1

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