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    <p>Ya.. when I began iPhone dev.. the rootViewController thing threw me for a loop too. But it’s really straight forward.</p> <p>when the app starts, I create a UIWindow object in my app delegate class. Also, in that class, I have a property of type UIWindow called window;</p> <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { UIWindow *w = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; self.window=w; [w release]; // other code here... } </code></pre> <p>I then create a <code>UIViewController</code> whose <code>view</code> will be the first view in the window hierarchy, this could be called the "root view controller".</p> <p>The confusing part is...that often we create a <code>UINavigationController</code> as the "root view controller" and that navigation controller has an init method that asks for a "RootViewController", which is the first viewcontroller it will place on its stack.</p> <p>So, the window gets a "root view controller", which is the <code>UINavigationController</code>, which also has a RootViewController, which is the first view controller you want to show.</p> <p>once you sort that out, its all makes sense.. I think :-) </p> <p>here is some code that does it all.. (taken from a project I have open in front of me)</p> <pre><code>//called with the app first loads and runs.. does not fire on restarts while that app was in memory - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { //create the base window.. an ios thing UIWindow *w = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; self.window=w; [w release]; // this is the home page from the user's perspective //the UINavController wraps around the MainViewController, or better said, the MainViewController is the root view controller MainViewController *vc = [[MainViewController alloc]init]; UINavigationController *nc = [[UINavigationController alloc]initWithRootViewController:vc]; self.navigationController=nc; // I have a property on the app delegate that references the root view controller, which is my navigation controller. [nc release]; [vc release]; //show them [self.window addSubview:nc.view]; [self.window makeKeyAndVisible]; return YES; } </code></pre>
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    1. POProgramming iOS: clarifications about Root View Controller
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    1. USJason Cragun
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    1. COBut this doesn't set window.rootViewController, does it?
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    2. COthe "relatively new" property window.rootViewController (as of 4.0) does add it to the window hierarchy and holds a reference to the windows root view controller.
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      1. USJason Cragun
    3. CORight, so, I don't see it being set, the VC is being added via `[self.window addSubview:nc.view];`, so this example would leave it unset, right?
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