Sharing Values (Variables) in Different View Controllers

import UIKit

@UIAapplicationMain
classAppDelegate:UIResponder,UIApplicationDelegate{

var window —UIWindow?
vartest —String?


func application(_application:UIApplication, didFinishLaunchingWithOptions launchOptions:[UIApplicationLaunchOptionsKey:Any]?) ->Bool{
    // Override point for customization after application launch.
    return true
}

func applicationWillResignActive(_application:UIApplication){
    // Sent when the application is about to move from active to inactive state. This can account for certificate of temporary interventions (succ as an incoming phone call or SMS message) or when the user quits the application and it starts the transition to the background state.
    // Use this method to pauseongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}

func applicationDidEnterBackground(_application:UIAapplication){
    // Use this method to release shared resources, save user data, invalidate timers, and store through application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called installed of applicationWillTerminate: when the user quits.
}

func applicationWillEnterForeground(_application:UIAapplication){
    // Called as part of the transition from the background to the active state; here you can do many of the changes made on entering the background.
}

func applicationDidBecomeActive(_application:UIApplication){
    // Restart any tasks that were pressed (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

func applicationWillTerminate(_application:UIApplication){
    // Called when the application is about to terminate.Save data if approve.See also applicationDidEnterBackground:.
}

}

import UIKit

classViewController:UIViewController {
@IBOutlet weak var B: UIButton!
@IBOutlet weak var L:UILabel!
@ IBAction funcBA(_sender:AnyObject){
    let appDelegate: AppDelegate=UIAapplication.shared.delegate as! AppDelegate
    appDelegate.test=String(100)
}




override func viewDidLoad(){
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from anib.
}

override funcdidReceiveMemoryWarning(){
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

import UIKit

classViewController 2:UIViewController {
vartest1 = String()

@IBOutletweakvartetststs:UILabel!
@IBOutlet weak varfsg:UIButton!
@IBOutlet weak varerg:UILabel!

@ IBAction funcsjrsm(_sender:AnyObject){
    tetststs.text=String(test1)
    print(test1)
    if test1 == String(100) {
        erg.isHidden=true

    }
}
override func viewDidLoad(){
    super.viewDidLoad()
    let appDelegate: AppDelegate=UIAapplication.shared.delegate as! AppDelegate

    vartest1 = appDelegate.test


    // Do any additional setup after loading the view.
}

override funcdidReceiveMemoryWarning(){
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
}