How does Xcode load the main storyboard?

Question

When I create a new single view application in Xcode 4.6 using storyboard, we can see that the main function creates a new application using the application delegate like th

Answer 1

Give a look to the UIApplicationMain discussion:

Discussion
This function instantiates the application object from the principal class and instantiates the delegate (if any) from the given class and sets the delegate for the application. It also sets up the main event loop, including the application’s run loop, and begins processing events. If the application’s Info.plist file specifies a main nib file to be loaded, by including the NSMainNibFile key and a valid nib file name for the value, this function loads that nib file.

When UIApplicationMain gets called, a plist file containing all the application info is loaded:

That's how it "understands" that the xib/storyboard file needs to get loaded.

Answer 2

In Xcode 11.3.1, changing Main storyboard file base name alone is not enough, there's a Storyboard Name configuration in the Application Scene Manifest that should also be changed as well.

    <key>UIApplicationSceneManifest</key>
    <dict>
        <key>UIApplicationSupportsMultipleScenes</key>
        <false/>
        <key>UISceneConfigurations</key>
        <dict>
            <key>UIWindowSceneSessionRoleApplication</key>
            <array>
                <dict>
                    <key>UISceneConfigurationName</key>
                    <string>Default Configuration</string>
                    <key>UISceneDelegateClassName</key>
                    <string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
                    <key>UISceneStoryboardFile</key>
                    <string>Home</string>
                </dict>
            </array>
        </dict>
    </dict>

Answer 3

Bit late to the party but you can get to the viewController from the window as shown below

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        var viewController = window?.rootViewController as? ViewController
        if let viewController = viewController {
            // do awesome stuff
        }

        return true
    }
}

Answer 4

If you want to instantiate with Swift

var storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
var vc : AnyObject! = storyboard.instantiateInitialViewController()
self.window!.rootViewController = vc as UIViewController
self.window!.makeKeyAndVisible()

Answer 5

It is started from the UIMainStoryboardFile setting from your info.plist file. Xcode then creates a main window, instantiates your first view controller, and adds it to the window. You can still do this in code similar to the .nib using

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController* initialView = [storyboard instantiateInitialViewController];

Answer 6

In Xcode, the human-readable Info.plist section that determines the main storyboard is:

Main storyboard file base name

In plain text, the key is UIMainStoryboardFile:

<key>UIMainStoryboardFile</key>
<string>Main</string>