iOS WKWebview load local PDF Files some pages become black

Question

I user wkwebview to load a local pdf file and it works fine. But when I scroll up and down to some pages, some pages become black. Have you also come across this problem?

Answer 1

This one works for me.

Assuming you are implementing WKNavigationDelegate (YourWebView.navigationDelegate) in your ViewController.

- (void)webView:(WKWebView *)webView 
didFinishNavigation:(WKNavigation *)navigation 
{
   UIView *v = webView;
    while (v) {
        v.backgroundColor = [UIColor whiteColor];
        v = [v.subviews firstObject];
    }
}

For reference: Rendering PDF in UIWebView iOS 8, causes a black border around PDF

Answer 2

For iOS 11.0+ use PDFView (also see PDFKit) to display a PDF. PDFView does not have the issue with black pages.