Transparent background for WKWebView

Question

For iOS 10+ using Swift:

self.webView = WKWebView()
self.webView!.isOpaque = false
self.webView!.backgroundColor = UIColor.clear
self.webView!.scrollView.backgroundColor = UIColor.clear

This code might help you. Updated for Swift 3+

self.webView = WKWebView()
self.webView.isOpaque = false
self.webView.backgroundColor = UIColor.clear
self.webView.scrollView.backgroundColor = UIColor.clear

using objective c.
wkWebView.backgroundColor = [UIColor clearColor];
wkWebView.scrollView.backgroundColor = [UIColor clearColor];
wkWebView.opaque = false;

It will remove the white background colour in wkwebView.

This bug seems to be fixed in Beta 5.

I know this is a very old question. But I've been struggling with this today. I don't know if it's just me, but webView.backgroundColor was undefined in WKWebView, and webView.opaque was read-only. The only way for me to fix this was to set the web views layer background color to the CGColor clear

webview.wantsLayer = true
webView.layer?.backgroundColor = NSColor.clearColor().CGColor

and the containing NSView the same way

webViewParent.layer?.backgroundColor = NSColor.clearColor().CGColor

That's the only thing that worked for me, I hope it could help someone else as well.