WKWebView JavaScript?

I switched from the WebView to the WKWebview. It seems that the stringByEvaluatingJavaScriptFromString method does not exist? Is there a replacement method or a different way to inject JS?

Code:

  Method not found: stringByEvaluatingJavaScriptFromString:, target: <WKWebView: 0x14b0be00; frame = (0 0; 414 667); layer = <CALayer: 0x1467add0>>  

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