How does Xcode load the main storyboard?
IosObjective CXcodeIos Problem Overview
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 this:
return UIApplicationMain(argc, argv, nil, NSStringFromClass([MyAppDelegate class]));
However if we look at MyAppDelegate.h and MyAppDelegate.m, there is nowhere in the code that references MainStoryboard.storyboard. This differs from a non-storyboard version where we can find the line of code that loads the nib file programmatically.
So my question is, how does the storyboard get loaded? (where should I poke to find it?)
Ios Solutions
Solution 1 - Ios
Look at your Target settings for the Project
Notice the Main Storyboard setting.
If you wanted to do this in code yourself, you would do something like.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:[NSBundle mainBundle]];
UIViewController *vc = [storyboard instantiateInitialViewController];
// Set root view controller and make windows visible
self.window.rootViewController = vc;
[self.window makeKeyAndVisible];
return YES;
}
Solution 2 - Ios
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.
Solution 3 - Ios
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];
Solution 4 - Ios
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>
Solution 5 - Ios
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()
Solution 6 - Ios
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>
Solution 7 - Ios
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
}
}