Passing Data between View Controllers in Swift

Question

I am trying to convert an app from Objective-C to Swift but I can't find how to pass data between views using Swift. My Objective-C code is

UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; AnsViewController *ansViewController; ansViewController = [storyBoard instantiateViewControllerWithIdentifier:@"ansView"]; ansViewController.num = theNum; [self presentViewController:ansViewController animated:YES completion:nil]; 

What that is doing is it basically takes the variable, theNum, and passes it to the variable, num, on a different view controller. I know this may be an easy question but I am getting pretty confused with Swift so if someone could explain how they changed it to Swift that would be greatly appreciated!

Thanks

Answer 1

Let's assumed we stand at the firstView go to the DetailView and want passing data from firstView to Detailview. To do that with storyboard, at the firstView we will have a method:

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {     if (segue.identifier == "segueTest") {       //Checking identifier is crucial as there might be multiple       // segues attached to same view       var detailVC = segue!.destinationViewController as DetailViewController;       detailVC.toPass = textField.text     } } 

and then into the class of DetailView we declared a variable:

var toPass: String! 

then you can use the variable toPass (of course you can change the type of the variable as you want, in this EX I just demo for string type).