Saving VC on exit (IOS) - ios

Question

I have the code to save VC on exit.
It works but I use SWRevealViewController but the navigation controller in the application is not displayed
How can I correct it?
ViewController.swift
super.viewDidLoad()
NSUserDefaults.standardUserDefaults().setInteger(0, forKey: "View")
ViewController2.swift
super.viewDidLoad()
NSUserDefaults.standardUserDefaults().setInteger(1, forKey: "View")
AppDelegate.swift
let viewCount = UserDefaults.standard.integer(forKey: "View")
var VC = UIViewController()
let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
print(viewCount)
if viewCount == 0 {
VC = storyboard.instantiateViewController(withIdentifier: "First") as! ViewController
} else if viewCount == 1 {
VC = storyboard.instantiateViewController(withIdentifier: "Second") as! ViewController2
}
self.window?.makeKeyAndVisible()
self.window?.rootViewController = VC
return true
Error
My StoryBoard

Answer 1

So I think the issue is that you are setting the root view controller of the window to be a regular view controller. What you need to do is set this to be a navigation controller with your embedded view controllers. I'm not sure of your exact setup with SWRevealViewController but I guess you need something like this:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
let viewCount = UserDefaults.standard.integer(forKey: "View")
let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let VC = storyboard.instantiateViewController(withIdentifier: "First") as! ViewController
let frontNavigationController = UINavigationController(rootViewController: VC)
let VC2 = storyboard.instantiateViewController(withIdentifier: "TableView") as! TableView
let rearNavigationController = UINavigationController(rootViewController: VC2)
let revealVC = SWRevealViewController(rearViewController: rearNavigationController, frontViewController: frontNavigationController)
revealVC.delegate = self
self.window?.rootViewController = nil
self.window?.rootViewController = revealVC
self.window?.makeKeyAndVisible()
return true
}
If this isn't working, or what you are looking to achieve, please ask in comments.
EDIT:
So, if you want to display the TableView menu on the left, you have to set the storyboard id of it to be TableView (obvs set this in the storyboard). And then the code above should work.
I'm not entirely sure why you are using UserDefaults to save the VC. But you can now use the TableView class to navigate between VCs. If you want to save the last visited VC and display this on application finished launching, you would need this:
var string = ""
switch viewCount {
case 0:
string = "First"
case 1:
string = "Second"
case 2:
string = "Third"
case 3:
string = "Fourth"
case 4:
string = "Fifth"
default:
string = "First"
}
let VC = storyboard.instantiateViewController(withIdentifier: string)
let frontNavigationController = UINavigationController(rootViewController: VC)
Just make sure you have set the storyboard id of each VC to be "First", "Second", "Third" and so on. This would replace the previous declarations of let VC and let frontNavigationController in my above answer.

Answer 2

If in your storyboard your initial ViewController is UINavigationViewController then you can access this navigation controller in AppDelegate's didFinishLaunchingWithOptions as follows:
let navigationController = application.windows[0].rootViewController as! UINavigationController
Also, there is no need to track/save your view controllers in UserDefaults, you can always access the list of ViewControllers like this
AppDelegate
let childViewControllers = window?.rootViewController?.childViewControllers
print("childVC: \(String(describing: childViewControllers))")
In Any other ViewController
let childViewControllers = UIApplication.shared.keyWindow?.rootViewController?.childViewControllers
print("vcs : \(String(describing: childViewControllers))")
And of course, you can compare childViewControllers list
if let childViewControllers = UIApplication.shared.keyWindow?.rootViewController?.childViewControllers {
for viewController in childViewControllers {
if viewController is FirstViewController {
print("firstViewController found...")
}
if viewController is SecondViewController {
print("secondViewController found...")
}
}
}
In case if you're setting SWRevealViewController for side-menu using storyboard then the basic setup should be like
For more detail on SWRevealViewController have a look at their GitHub documentation, check sample project and mentioned tutorials here for deep understanding. Hope it helps.