add support for storyboard images

inspired by devgeeks#62

src/ios/PrivacyScreenPlugin.m

@@ -40,7 +40,12 @@ - (void)onAppWillResignActive:(UIApplication *)application
     imageView = [[UIImageView alloc]initWithFrame:[self.viewController.view bounds]];
     imageView.contentMode = UIViewContentModeScaleAspectFill;
     [imageView setImage:splash];
-
+
+    if ([self isUsingCDVLaunchScreen]) {
+      // launch screen expects the image to be scaled using AspectFill.
+      imageView.contentMode = UIViewContentModeScaleAspectFill;
+    }
+
     #ifdef __CORDOVA_4_0_0
         [[UIApplication sharedApplication].keyWindow addSubview:imageView];
     #else
@@ -75,13 +80,27 @@ - (CDV_iOSDevice) getCurrentDevice
   return device;
 }
 
+- (BOOL) isUsingCDVLaunchScreen {
+    NSString* launchStoryboardName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UILaunchStoryboardName"];
+    if (launchStoryboardName) {
+        return ([launchStoryboardName isEqualToString:@"CDVLaunchScreen"]);
+    } else {
+        return NO;
+    }
+}
+
 - (NSString*)getImageName:(UIInterfaceOrientation)currentOrientation delegate:(id<CDVScreenOrientationDelegate>)orientationDelegate device:(CDV_iOSDevice)device
 {
   // Use UILaunchImageFile if specified in plist.  Otherwise, use Default.
   NSString* imageName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UILaunchImageFile"];
 
   NSUInteger supportedOrientations = [orientationDelegate supportedInterfaceOrientations];
-
+
+  // Detect if we are using Launch Storyboard and return the associated image instead
+  if ([self isUsingCDVLaunchScreen]) {
+    imageName = @"LaunchStoryboard";
+    return imageName;
+  }
   // Checks to see if the developer has locked the orientation to use only one of Portrait or Landscape
   BOOL supportsLandscape = (supportedOrientations & UIInterfaceOrientationMaskLandscape);
   BOOL supportsPortrait = (supportedOrientations & UIInterfaceOrientationMaskPortrait || supportedOrientations & UIInterfaceOrientationMaskPortraitUpsideDown);