Swift – Instantiating a navigation controller without storyboards in App Delegate
Solution 1
In Swift 3
Place this code inside didFinishLaunchingWithOptions method in AppDelegate class.
window = UIWindow(frame: UIScreen.main.bounds)
let mainController = MainViewController() as UIViewController
let navigationController = UINavigationController(rootViewController: mainController)
navigationController.navigationBar.isTranslucent = false
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
Solution 2
In AppDelegate
var window: UIWindow?
var navController: UINavigationController?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
navController = UINavigationController()
var viewController: ViewController = ViewController()
self.navController!.pushViewController(viewController, animated: false)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window!.rootViewController = navController
self.window!.backgroundColor = UIColor.whiteColor()
self.window!.makeKeyAndVisible()
return true
}
In ViewController
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.title = "FirstVC"
var startFinishButton = UIButton.buttonWithType(UIButtonType.System) as! UIButton
startFinishButton.frame = CGRectMake(100, 100, 100, 50)
startFinishButton.backgroundColor = UIColor.greenColor()
startFinishButton.setTitle("Test Button", forState: UIControlState.Normal)
startFinishButton.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(startFinishButton)
}
func buttonAction(sender:UIButton!)
{
println("Button tapped")
let vc = SecondViewController()
self.navigationController?.pushViewController(vc, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Zack Shapiro
Updated on April 12, 2020Comments
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Zack Shapiro about 4 years
I'm rebuilding an app without storyboards and the part of it that I'm having the most trouble with is navigating view-to-view programatically. Few things are written out there which don't use storyboards, so finding an answer for this has been tough.
My problem is pretty simple. I have my
ViewController
and mySecondViewController
and I want to push from the former to the latter.In
AppDelegate
:func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { // Override point for customization after application launch. window = UIWindow(frame: UIScreen.mainScreen().bounds) window?.backgroundColor = UIColor.whiteColor() window?.rootViewController = ViewController() window?.makeKeyAndVisible() return true }
Then in
ViewController.swift
:class ViewController: UIViewController, AVAudioPlayerDelegate, UITextFieldDelegate { override func viewDidLoad() { super.viewDidLoad() startFinishButton.setTitle("Begin", forState: .Normal) startFinishButton.addTarget(self, action: "moveToSecondViewController", forControlEvents: .TouchUpInside) view.addSubview <*> startFinishButton } func moveToSecondViewController(sender: UIButton) { let vc = SecondViewController() println(self.navigationController) // returns nil self.navigationController?.pushViewController(vc, animated: true) } }
Printing
self.navigationController
returns nil. I've tried doing:var navController = UINavigationController()
when theViewController
class is created (but outside of ViewDidLoad, right under the class declaration) and done the push using thenavController
var but that hasn't worked.I'm thinking maybe the solution is to create a navigation controller in App Delegate that the whole app would use, I guess as a global variable?
My hope is that this post can serve many others who are new to Swift and want to remove storyboards from their app.
Thanks for taking a look and for your help.