fix: Unsupported URL issue on Ionic WKWebView

Author: liammazy

lib/imgcache.js

@@ -175,11 +175,21 @@ LOG_LEVEL_ERROR = 3;
     return (Helpers.isCordovaAndroid() && device.version && (device.version.indexOf('2.') === 0 || device.version.indexOf('3.') === 0));
   };
 
+  // special case for #223 #237 #246
+  Helpers.ionicNormalizer =  window.Ionic &&
+      ((window.Ionic.WebView && window.Ionic.WebView.convertFileSrc) || window.Ionic.normalizeURL);
+
+  Helpers.isIonicNormalizerFunctionExist = function() {
+    return (typeof Helpers.ionicNormalizer === 'function');
+  };
+
   // Fix for #42 (Cordova versions < 4.0)
   Helpers.EntryToURL = function (entry) {
     if (Helpers.isCordovaAndroidOlderThan4() && typeof entry.toNativeURL === 'function') {
       return entry.toNativeURL();
-    } else if (typeof entry.toInternalURL === 'function') {
+    } else if (
+        !Helpers.isIonicNormalizerFunctionExist() && // Fix for #223 #237 #246
+        (typeof entry.toInternalURL === 'function')) {
       // Fix for #97
       return entry.toInternalURL();
     } else {
@@ -190,7 +200,9 @@ LOG_LEVEL_ERROR = 3;
   // Returns a URL that can be used to locate a file
   Helpers.EntryGetURL = function (entry) {
     // toURL for html5, toURI for cordova 1.x
-    return (typeof entry.toURL === 'function' ? Helpers.EntryToURL(entry) : entry.toURI());
+    var url = (typeof entry.toURL === 'function' ? Helpers.EntryToURL(entry) : entry.toURI());
+    // Fix for #223 #237 #246
+    return Helpers.isIonicNormalizerFunctionExist() ? Helpers.ionicNormalizer(url) : url;
   };
 
   // Returns the full absolute path from the root to the FileEntry