Inject javascript into SwiftUI WebKit

user_13435886 0
Viewed 1354

How would I set the text size of a SwiftUI WebKit View to a @State variable? I have this code that allows me to use WebViews in SwiftUI

import SwiftUI
import WebKit

struct WebView : UIViewRepresentable {

   var url : URL;

   func makeUIView(context: Context) -> WKWebView {
       return WKWebView();
   }

   func updateUIView(_ uiView: UIViewType, context: Context) {
       uiView.loadFileURL(url, allowingReadAccessTo: url)
   }
}

I saw this and tried to replicate it,

    class Coordinator : NSObject {
        func webView(_ webView: WKWebView, js : String) {
            webView.evaluateJavaScript(js)
        }
    }

But I wasn't able to get it to work.

Thanks in advance.

swiftui swift webkit
1 Answers

You can try to do this in navigation delegate, after loading did finish, as shown below:

class Coordinator : NSObject, WKNavigationDelegate {
    // ... any other code

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        webView.evaluateJavaScript(js, completionHandler: { (value, error) in
             // .. do anything needed with result, if any
        })
    }
}

struct WebView : UIViewRepresentable {

   var url : URL;

   func makeUIView(context: Context) -> WKWebView {
       let webview = WKWebView()
       webview.navigationDelegate = context.coordinator
       return webview
   }

    func makeCoordinator() -> Coordinator {
        Coordinator()
    }

   func updateUIView(_ uiView: UIViewType, context: Context) {
       uiView.loadFileURL(url, allowingReadAccessTo: url)
   }
}
user_122990300
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