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1. ViewController
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// hier fehlt Code
}
2/3./4. ViewController, für alle
@IBAction override func unwind(for unwindSegue: UIStoryboardSegue, towards subsequentVC: UIViewController) {
// hier fehlt kein Quellcode
}
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