Calculate UIWebView Content dynamic Height using 'document.body.scrollHeight;' returns bigger value in iOS 10

Question

I am creating on an application using Objective C, where I'm using a UIWebView to display contents in HTML format. I am using below code in UIWebView delegate method webViewDidFinishLoad

NSUInteger contentHeight = [[aWebView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.body.scrollHeight;"]] intValue];

to calculate the webview content height, this is working fine in iOS8, iOS9 and iOS11 but in iOS10 iPhone mobiles the content height returning a much bigger value than the actual content value. Because of this, I am getting some extra white space in bottom of my webview in screen.

I tried all the solutions but getting the same wrong content height only in iOS 10. Please help me to resolve this problem. Thank You in Advance!

Answer 1

I had used following way to get contentSize.

i have added observer(KVO) on webview's scrollview.

self.webView.scrollView.addObserver(self, forKeyPath: "contentSize", options: .new, context: nil);

Now, whenever contentsize of webview will get changed, i get callback in this method

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
}

Now take the contentSize of object from this method and use that.