swift share information between two classes - swift

Question

I have a tabbed view app that I am working on right now I am wondering if there's any way I can share the information from my FirstViewController.swift to my SecondViewController.swift? Since I know swift doesnt support multiple class inheritance, is there a way that I can use the variables and informations I have on my FirstViewController in my SecondViewController?

Answer 1

You'll need a model outside the context of both your view controllers to store data, and then a way to populate those view controllers with that data and provide a reference to the model to make changes from the view controllers. You could this by creating a new model object that conforms to UITabBarColtronnerDelegate, which will allow you access to a view controller after it is selected. Keep things decoupled by abstracting these relationships into protocols, which then allows your implementations to vary independently as your app scales up.
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
let applicationModel = ApplicationModel()
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
if let tabBarController = window?.rootViewController as? UITabBarController {
tabBarController.delegate = applicationModel
}
return true
}
}
protocol TabbedViewControllerDelegate {
var message: String { set get }
}
class ApplicationModel: NSObject, UITabBarControllerDelegate, TabbedViewControllerDelegate {
var message = "Hello World!"
func tabBarController(tabBarController: UITabBarController, didSelectViewController viewController: UIViewController) {
if var tabbedViewController = viewController as? TabbedViewController {
tabbedViewController.message = message
tabBarController.delegate = self
}
}
}
protocol TabbedViewController {
var message: String { set get }
var delegate: TabbedViewControllerDelegate? { get set }
}
class FirstViewController: UIViewController, TabbedViewController {
var delegate: TabbedViewControllerDelegate?
var message: String = "" {
didSet {
println( "FirstViewController populated with message: \(message)" )
}
}
#IBAction func buttonPressed( sender: AnyObject? ) {
self.delegate?.message = "Updated message from FirstViewController"
}
}
class SecondViewController: UIViewController, TabbedViewController {
var delegate: TabbedViewControllerDelegate?
var message: String = "" {
didSet {
println( "SecondViewController populated with message: \(message)" )
}
}
#IBAction func buttonPressed( sender: AnyObject? ) {
self.delegate?.message = "Updated message from SecondViewController"
}
}