Objective-C Programmatic title not showing - ios

Question

I have set my self.navigationItem.title = #"Hello"; in ViewController.m but it's not showing:
AppDelegate.m
#import "AppDelegate.h"
#import "ViewController.h"
#interface AppDelegate ()
#end
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
ViewController *viewController = [[ViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
#pragma mark - UISceneSession lifecycle
- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options API_AVAILABLE(ios(13.0)) {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return [[UISceneConfiguration alloc] initWithName:#"Default Configuration" sessionRole:connectingSceneSession.role];
}
- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions API_AVAILABLE(ios(13.0)) {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
#end
ViewController.m
#import "ViewController.h"
#import <UIKit/UIKit.h>
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = #"Hello";
self.view.backgroundColor = [UIColor systemBlueColor];
}
#end
Thanks in advance!

Answer 1

I'm considering that you're not using storyboard.
In your case, you have to do everything programmatically, including allocating the navbar.
- (void)viewDidLoad {
[super viewDidLoad];
UINavigationBar *navbar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, 44)];
UINavigationItem *title = [[UINavigationItem alloc] initWithTitle:#"Hello"];
self.view.backgroundColor = [UIColor systemBlueColor];
[navbar setItems:#[title]];
[self.view addSubview:navbar];
}
If you were using storyboard, this simple command would be working, without needing anything in the appDelegate.
self.navigationItem.title = #"Hello";

Answer 2

It is enough to say: viewController.title = #“Hello”;
https://developer.apple.com/documentation/uikit/uiviewcontroller/1621364-title