Let's say you've control click dragged from a UIButton to another UIViewController in your storyboard. You've now created a segue.
Click on it, and in the attributes inspector tab, name its identifier segue1
.
In your view controller from which you're leaving for the new one, add this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "segue1") {
let detailVC = segue.destination as! SomeViewController;
detailVC.someValue = "JOHN COLTRANE"
}
}
This says for the identifier segue1
which we named above, cast the UIViewController to SomeViewController
, the name of our destination view controller.
Then set a property on that view controller, named simply via var someValue = "blar"
for example in your destination controller.
Note, as soon as you have detailVC
in the example above, the view controller will be initialised and visible on the screen.