How to send data back by popViewControllerAnimated for Swift?

Question

I need to send some data back from secondView to First View by popView. How can i send back the data by popViewControllerAnimated?

Thanks!

Answer 1

You can pass data back using delegate

1. Create protocol in ChildViewController
2. Create delegate variable in ChildViewController
3. Extend ChildViewController protocol in MainViewController
4. Give reference to ChildViewController of MainViewController when navigate
5. Define delegate Method in MainViewController
6. Then you can call delegate method from ChildViewController

Example

In ChildViewController: Write code below...

protocol ChildViewControllerDelegate {      func childViewControllerResponse(parameter) }  class ChildViewController:UIViewController {     var delegate: ChildViewControllerDelegate?     .... } 

In MainViewController

// extend `delegate` class MainViewController:UIViewController,ChildViewControllerDelegate {     // Define Delegate Method     func childViewControllerResponse(parameter)     {        .... // self.parameter = parameter     } } 

There are two options:

A) with Segue

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {    let goNext = segue.destinationViewController as ChildViewController    goNext.delegate = self } 

B) without Segue

let goNext = storyboard?.instantiateViewControllerWithIdentifier("childView") as ChildViewController goNext.delegate = self self.navigationController?.pushViewController(goNext, animated: true) 

Method Call

self.delegate?.childViewControllerResponse(parameter)