How to replace RootViewController in "Navigation-based application"

Question

I have an application that uses the "navigation-based application" template in XCode.

Now I want to change it so that the first view that loads is a regular (custom) UIView, and if the user clicks a particular button, I push the original RootViewController onto the NavigationController.

I understand that somewhere, someone is calling this with my RootViewController:

- (id)initWithRootViewController:(UIViewController *)rootViewController

I want to know how to replace the argument with my new class.

Answer 1

if you want to replace the root view controller of your navigation stack you can replace the first object of its view controllers array as -

NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];

NewViewController *nvc = [[NewViewController alloc] init];
[viewControllers replaceObjectAtIndex:0 withObject:nvc];
[self.navigationController setViewControllers:viewControllers];

Answer 2

^ These are all ways to do it programmatically. Thats cool. But I use the interface builder and storyboards in Xcode, so this is the easy and fast way to add a new view controller:

• Open the storyboard in question
• Add a new view controller to your storyboard by dragging it from the objects list (right hand tool bar bottom)
• While holding down the CONTROL key, click and drag from the middle of your navigation controller (should be blank and gray) to your new fresh white view.
• On the popup, selection Relation Segue: Root View Controller (should be below the normal push/modal/custom options you have likely seen before)

Tada! Enjoy your new root view controller without holding your day up with programmatic creation.

Answer 3

Look inside the main app delegate .m file and find the method

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

Inside it will be a line like this

self.window.rootViewController = self.navigationController;

You can instantiate a diffent view controller there and assign it to be the rootViewController