WKWebView JavaScript Message Handling in Swift: Logging Messages

This\ function\ is\ the\ delegate\ method\ for\ handling\ messages\ sent\ from\ JavaScript\ to\ the\ WKWebView.\ \ \ The\ function\ checks\ if\ the\ message\ name\ is\ "log"\ and\ then\ prints\ the\ body\ of\ the\ message.\ This\ allows\ you\ to\ receive\ and\ process\ messages\ sent\ from\ JavaScript\ within\ your\ app.