Merge pull request #198 from robertcnst/fix_ios_shared_process_pool_web_view

- added a shared WKProcessPool for webview instances

ios/Classes/FlutterWebViewController.swift

@@ -28,7 +28,7 @@ public class FlutterWebViewController: NSObject, FlutterPlatformView {
         
         let options = InAppWebViewOptions()
         options.parse(options: initialOptions)
-        let preWebviewConfiguration = InAppWebView.preWKWebViewConfiguration(options: options)
+        let preWebviewConfiguration = InAppWebView.preWKWebViewConfiguration(options: options, webViewProcessPool: SwiftFlutterPlugin.webViewProcessPool)
         
         webView = InAppWebView(frame: frame, configuration: preWebviewConfiguration, IABController: nil, IAWController: self)
         let channelName = "com.pichillilorenzo/flutter_inappwebview_" + String(viewId)

ios/Classes/InAppBrowserWebViewController.swift

@@ -113,7 +113,7 @@ class InAppBrowserWebViewController: UIViewController, UIScrollViewDelegate, WKU
     
     override func viewWillAppear(_ animated: Bool) {
         if !viewPrepared {
-            let preWebviewConfiguration = InAppWebView.preWKWebViewConfiguration(options: webViewOptions)
+            let preWebviewConfiguration = InAppWebView.preWKWebViewConfiguration(options: webViewOptions, webViewProcessPool: SwiftFlutterPlugin.webViewProcessPool)
             self.webView = InAppWebView(frame: .zero, configuration: preWebviewConfiguration, IABController: self, IAWController: nil)
             self.containerWebView.addSubview(self.webView)
             prepareConstraints()

ios/Classes/InAppWebView.swift

@@ -191,8 +191,9 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
         }
     }
     
-    public static func preWKWebViewConfiguration(options: InAppWebViewOptions?) -> WKWebViewConfiguration {
+    public static func preWKWebViewConfiguration(options: InAppWebViewOptions?, webViewProcessPool: WKProcessPool) -> WKWebViewConfiguration {
         let configuration = WKWebViewConfiguration()
+        configuration.processPool = webViewProcessPool
         
         if #available(iOS 10.0, *) {
             configuration.mediaTypesRequiringUserActionForPlayback = ((options?.mediaPlaybackRequiresUserGesture)!) ? .all : []

ios/Classes/SwiftFlutterPlugin.swift

@@ -38,6 +38,7 @@ public class SwiftFlutterPlugin: NSObject, FlutterPlugin {
     static var registrar: FlutterPluginRegistrar?
     static var channel: FlutterMethodChannel?
     
+    static let webViewProcessPool: WKProcessPool = WKProcessPool()
     var webViewControllers: [String: InAppBrowserWebViewController?] = [:]
     var safariViewControllers: [String: Any?] = [:]