How to exchange data between View Controllers
If you have two view controller classes you probably want to exchange data between them. Thanks to two methods we can do that, provided one view controller is presented via a modal segue. Here’s how it works step by step.
Imagine you had two labels on each View Controller. We’ll call them myLabel1 and myLabel2 (1is on ViewController, 2 on MyViewController). Both View Controllers need to be connected as described previously via a segue. You can access properties on ViewController from MyViewController like so:
self.myLabel1.text = ((MyViewController *)self.presentedViewController).myLabel2.text;
Likewise, if you’re in MyViewController you can access properties from ViewController like so:
self.myLabel2.text = ((ViewController *)self.presentingViewController).myLabel1.text;