Use WKWebView on macOS

 # Changelog
 
+## 5.14.0
+
+- Replace WebView with WKWebView on macOS
+
 ## 5.13.4
 
 - Improve Web Browser detection logic

@@ -215,6 +215,7 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
 //        }
     }
 
+    @available(macOS 11.0, *)
     public func convertHtml(_ data: String, withPageSize size: CGRect, andMargin margin: CGRect, andBaseUrl baseUrl: URL?) {
         let tempFile = NSTemporaryDirectory() + NSUUID().uuidString
         let directoryURL = URL(fileURLWithPath: tempFile)
@@ -230,23 +231,20 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
         printInfo.rightMargin = size.width - margin.maxX
         printInfo.bottomMargin = size.height - margin.maxY
 
-        let webView = WebView()
-        webView.mainFrame.loadHTMLString(data, baseURL: baseUrl)
+        let webView = WKWebView(frame: CGRect.zero)
+        webView.loadHTMLString(data, baseURL: baseUrl)
         let when = DispatchTime.now() + 1
 
         DispatchQueue.main.asyncAfter(deadline: when) {
-            let printOperation = NSPrintOperation(view: webView.mainFrame.frameView.documentView, printInfo: printInfo)
-            printOperation.showsPrintPanel = false
-            printOperation.showsProgressPanel = false
-            printOperation.run()
-
-            do {
-                let data = try Data(contentsOf: directoryURL)
+            webView.createPDF { result in
+                switch result {
+                case .success(let data):
                     self.printing.onHtmlRendered(printJob: self, pdfData: data)
                     let fileManager = FileManager.default
-                try fileManager.removeItem(atPath: tempFile)
-            } catch {
-                self.printing.onHtmlError(printJob: self, error: "Unable to load the pdf file from \(tempFile)")
+                    try? fileManager.removeItem(atPath: tempFile)
+                case .failure(let error):
+                    self.printing.onHtmlError(printJob: self, error: "Unable to create PDF: \(error.localizedDescription)")
+                }
             }
         }
     }
@@ -305,10 +303,15 @@ public class PrintJob: NSView, NSSharingServicePickerDelegate {
     }
 
     public static func printingInfo() -> NSDictionary {
+        var html = false
+        if #available(macOS 11.0, *) {
+            html = true
+    }
         let data: NSDictionary = [
             "directPrint": true,
             "dynamicLayout": true,
             "canPrint": true,
+            "canConvertHtml": html,
             "canShare": true,
             "canRaster": true,
             "canListPrinters": true,

@@ -115,6 +115,7 @@ public class PrintingPlugin: NSObject, FlutterPlugin {
             let marginBottom = CGFloat((args["marginBottom"] as? NSNumber)?.floatValue ?? 0.0)
             let printJob = PrintJob(printing: self, index: args["job"] as! Int)
 
+            if #available(macOS 11.0, *) {
                 printJob.convertHtml(
                     args["html"] as! String,
                     withPageSize: CGRect(
@@ -132,6 +133,9 @@ public class PrintingPlugin: NSObject, FlutterPlugin {
                     andBaseUrl: args["baseUrl"] as? String == nil ? nil : URL(string: args["baseUrl"] as! String)
                 )
                 result(NSNumber(value: 1))
+            } else {
+                result(NSNumber(value: 0))
+            }
         } else if call.method == "printingInfo" {
             result(PrintJob.printingInfo())
         } else if call.method == "rasterPdf" {

@@ -15,7 +15,7 @@ topics:
   - print
   - printing
   - report
-version: 5.13.4
+version: 5.14.0
 
 environment:
   sdk: ">=3.3.0 <4.0.0"