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How can I pass data back to the first view controller in Swift?

I have two view controllers and I have this code to navigate between two views

ViewController:
func goToSecondViewController() {
  let aa = self.storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as SecondViewController
  self.navigationController.pushViewController(aa, animated: true)
}

/

SecondViewController:
func goToFirstViewController() {
  self.navigationController.popToRootViewControllerAnimated(true)
}

How do I send some data in the first view before putting it out?

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1 answer


If A is a view controller with the following declaration:

class A : UIViewController {
   var data: String!
}

Then, whenever you have an instance of A, you can simply set the data property directly:

let a = A() // assuming you've defined the init method
a.data = "hello"


Edit

If you want to send data before appearing, you should do something like:

func goToFirstViewController() {
  let a = self.navigationController.viewControllers.first as! A
  a.data = "data"
  self.navigationController.popToRootViewControllerAnimated(true)
}

(did not compile above)

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