Merge pull request pichillilorenzo#9 from jj-lin/TWECACAPP-547-iOS12-…

…set-cookie-no-completion

Solve the no set cookie completionHandler not called issue

ios/Classes/MyCookieManager.swift

@@ -114,6 +114,15 @@ class MyCookieManager: NSObject, FlutterPlugin {
         MyCookieManager.httpCookieStore!.setCookie(cookie, completionHandler: {() in
             result(true)
         })
+
+        // The `completionHandler` of WKHTTPCookieStore's `setCookie` not called at iOS11 ~ iOS12
+        // The following code could ensure the `completionHandler` will be called after cookie setup.
+        // ref: https://forums.developer.apple.com/message/309275
+        // ref: https://bugs.webkit.org/show_bug.cgi?id=185483
+        guard #available(iOS 13.0, *) else {
+            WKWebsiteDataStore.default().fetchDataRecords(ofTypes: [WKWebsiteDataTypeCookies]) { _ in }
+            return
+        }
     }
 
     public static func getCookies(url: String, result: @escaping FlutterResult) {