Fix per pull request BradLarson#2099.

Author: BradLarson

examples/iOS/SimpleImageFilter/SimpleImageFilter/SimpleImageAppDelegate.m

@@ -11,7 +11,7 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
     self.window.backgroundColor = [UIColor whiteColor];
 
     rootViewController = [[SimpleImageViewController alloc] initWithNibName:nil bundle:nil];
-    [self.window addSubview:rootViewController.view];
+    [self.window setRootViewController:rootViewController];
 
     [self.window makeKeyAndVisible];
     return YES;