How to pass value from navigationController to TabBarController

问题

I have a Login project. The first view controller is NavController and I need to pass user data to tabBarController where I have 3 NavigationControllers.

I tried this.

let openNewVC = self.storyboard?.instantiateViewControllerWithIdentifier("mainNavID") as! UITabBarController
//openNewVC.token = token!
self.navigationController?.pushViewController(openNewVC, animated: true)

回答1:

You can pass the data from your first view Controller to view controllers which are embedded like as below in UITabbarController.

UITabBarController -> UINavigationController -> UIViewController

You need to traverse the viewControllers instance of UITabBarController and UINavigationController in order to get the instance of UIViewController. Once you will get the instance of 'UIViewController' which is embedded into UITabbarController, you can assign the data as required.

For Example

if let tabBarController = self.storyboard?.instantiateViewControllerWithIdentifier("mainNavID") as? UITabBarController {

    // Now you need to get View Controllers array from tabBarControllers which is UINavigationControllers
    if let navigationControllers = tabBarController.viewControllers as? [UINavigationController] {
    for navigationController in navigationControllers {
        //Now you need to get the viewControllers from navigationController stack,

         let viewControllers = navigationController.viewControllers

        //Now you can assing desired value in viewControllers, I am assuming you need to assign the same value in all viewControler
        for viewController in viewControllers {

        }
        }
    }
    }

The best way to pass the data in this kind of architecture using Singleton, Assume you created a class Session which member variable token.

class Session {

    //Singleton
    static let sharedInstance = Session()

    //Token which you assign and you can use through out application
    var token : String? = nil
}

Now, you can assign the token while pushing the UITabbarController.

 let openNewVC = self.storyboard?.instantiateViewControllerWithIdentifier("mainNavID") as! UITabBarController
Session.sharedInstance.token = token    
//openNewVC.token = token!
self.navigationController?.pushViewController(openNewVC, animated: true)

Same token you can use within UIViewController

override func viewDidLoad() {
    super.viewDidLoad()

    if let token = Session.sharedInstance.token {
        //Now you have assigned token
    }
}

回答2:

You could try to set the values to the openNewVC as you would set a normal property.

Example:

//set instance
var openNewVC = self.storyboard?.instantiateViewControllerWithIdentifier("mainNavID") as! UITabBarController

// set properties
openNewVC.myFancyString = "Hello world!"

// set view controller active
self.navigationController?.pushViewController(openNewVC, animated: true)

来源：https://stackoverflow.com/questions/33373187/how-to-pass-value-from-navigationcontroller-to-tabbarcontroller

标签

swift

uitabbarcontroller

swift2

ios9