Passing Data between View Controllers in Swift

lagoon picture lagoon · Jun 14, 2014 · Viewed 49.8k times · Source

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

lee picture lee · Oct 15, 2014

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).