For anyone still having this issue you can fix it by adding some viewport constraints to the head of the html of the page you have loaded. I do this with some javascript I add to the end of the document:
lazy var webView: WKWebView = {
let configuration = WKWebViewConfiguration()
let source: String = "var meta = document.createElement('meta');" +
"meta.name = 'viewport';" +
"meta.content = 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no';" +
"var head = document.getElementsByTagName('head')[0];" +
		 "head.appendChild(meta);"
let script: WKUserScript = WKUserScript(source: source, injectionTime: .atDocumentEnd, forMainFrameOnly: true)
configuration.userContentController.addUserScript(script)
let webView = WKWebView(frame: .zero, configuration: configuration)
webView.navigationDelegate = self
return webView
}()
Alternatively if you are loading in html yourself you can get the same result like this:
webView.loadHTMLString("<html><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0 maximum-scale=1.0 user-scalable=no\" charset=\"utf-8\" /></head><body>\(YOUR-HTML-CODE-HERE)</body></html>", baseURL: nil)
Hope this helps!
vrijma
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