I've been trying to redo the work on my app programmatically. (Without the use of storyboards)
I'm almost done, except making the navigation controller manually.
Currently, I only have 1 viewcontroller. And of course the appDelegate
The navigation Controller, will be used throughout all pages in the application.
If anyone could help me out, or send a link to some proper documentation for doing this programmatically it would be greatly appreciated.
EDIT:
I forgot to mention it's in Swift.
In AppDelegate.swift
Swift 1, 2:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
var nav1 = UINavigationController()
var mainView = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
nav1.viewControllers = [mainView]
self.window!.rootViewController = nav1
self.window?.makeKeyAndVisible()
}
Swift 4+: and Swift 5+
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let nav1 = UINavigationController()
let mainView = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
nav1.viewControllers = [mainView]
self.window!.rootViewController = nav1
self.window?.makeKeyAndVisible()
}
UINavigationController(rootViewController: _) initializer instead of assigning an array with one element to the viewControllers property. But that is just to save one line of code :)
For those building newer projects with SceneDelegate.swift, you can use the 'var window: UIWindow?' in SceneDelegate instead of the removed 'var window' in AppDelegate
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
window?.windowScene = windowScene
window?.makeKeyAndVisible()
let viewController = ViewController()
let navViewController = UINavigationController(rootViewController: viewController)
window?.rootViewController = navViewController
}
I would recommend starting your AppDelegate with this skeleton:
1) use let wherever you can!
2) UINavigationController has the rootViewController property.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let viewController = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
let navigationController = UINavigationController(rootViewController: viewController)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
Here is another take in the SceneDelegate class:
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
let navController = UINavigationController()
let viewController = ViewController()
navController.viewControllers = [viewController]
window.rootViewController = navController
self.window = window
window.makeKeyAndVisible()
}
}
Try this one . It will guide you how to use navigation controller.
Programatically creating UINavigationController in iOS
AppDelegate.h
#import <UIKit/UIKit.h>
#import "LoginViewController.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong,nonatomic) UINavigationController *navigationController;
@property (strong,nonatomic) LoginViewController *loginVC;
@end
AppDelegate.m
#import "AppDelegate.h"
#import "LoginViewController.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.loginVC = [[LoginViewController alloc]initWithNibName:nil bundle:nil];
self.loginVC.title = @"Login Page";
self.navigationController = [[UINavigationController alloc]initWithRootViewController:self.loginVC];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
}
Then when you want to push the other view controller , simple use following code to move to another view controller.
- (IBAction)pushMyProfileView:(id)sender
{
self.myProfileVC = [[MyProfileViewController alloc]initWithNibName:nil bundle:nil];
[appDelegate.navigationController pushViewController:self.myProfileVC animated:YES];
}
It is probably overkill, but I find myself doing this often enough that I just extended UIViewController and created an embedInNavigationController method. So now I can just call viewController.embedInNavigationController.
extension UIViewController {
func embedInNavigationController() -> UINavigationController {
return UINavigationController(rootViewController: self)
}
}
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let storyboard_Secondary = UIStoryboard(name: "Secondary", bundle: nil)
var initialViewController = UIViewController()
let aUser = CommonMethods.loadCustomObject("\(Constants.kUserProfile)") as? User
if aUser?.respCode == 1 {
initialViewController = storyboard_Secondary.instantiateViewController(withIdentifier: "MainTabVC")
UIApplication.shared.statusBarStyle = .lightContent
let navigationController = UINavigationController(rootViewController: initialViewController)
navigationController.isNavigationBarHidden = true
self.window!.rootViewController = navigationController
self.window!.makeKeyAndVisible()
}
