A minimal iOS app set up entirely in code using Objective-C rather than using a storyboard and UIApplicationSceneManifest in the Info.plist.

main.m

// A minimal iOS app set up entirely in code using Objective-C rather than using a storyboard and UIApplicationSceneManifest in the Info.plist.
// Last updated for iOS 18.
// Swift version: https://gist.github.com/douglashill/b8125f7e2336b6a47461df0d4898f64d

@import UIKit;

@interface SceneDelegate : UIResponder <UIWindowSceneDelegate>
@end

@implementation SceneDelegate

@synthesize window = _window;

- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {
    self.window = [[UIWindow alloc] initWithWindowScene:(UIWindowScene *)scene];
    self.window.rootViewController = [[UIViewController alloc] init];
    [self.window makeKeyAndVisible];
}

@end

@interface AppDelegate: UIResponder <UIApplicationDelegate>
@end

@implementation AppDelegate

- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {
    UISceneConfiguration *configuration = [[UISceneConfiguration alloc] initWithName:nil sessionRole:connectingSceneSession.role];
    configuration.delegateClass = SceneDelegate.class;
    return configuration;
}

@end

int main(int argc, char * argv[]) {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass(AppDelegate.class));
}

Don't need the window property anymore. The window is retained by the scene in its windows property.

UIWindow *window = [[UIWindow alloc] initWithWindowScene:(UIWindowScene *)scene];
window.rootViewController = [[UIViewController alloc] init];
[window makeKeyAndVisible];

(And maybe fix the indentation of the two return statements while you're at it? :)

Hi @stianhoiland. Thanks for the suggestion, but running from Xcode 16.0 on an iOS 18.0 iPad simulator, I find keeping the window property is still necessary for the window to appear. I don’t see any issues with indentation in this file.