I want to call my function from another ViewController - ios

Question

I have a scrollView and there is a textView inside it and there is a function that slide my scrollView(with animation) in my main vc also I have a button(inside the black circle) ,when I press it, my pop up viewcontroller opens then I choose a value for animation delay in my function.
When I press my play button (inside the red circle) , I want to dismiss my pop up vc and I want my function to run. See:
func startScrollSlideShow(sliderValue: Float) {
if (scrollView.contentOffset.y <= (scrollView.contentSize.height - scrollView.frame.size.height)){
//reach bottom
UIScrollView.animate(withDuration: TimeInterval(sliderValue), delay: 0.5, options: .allowAnimatedContent, animations: {
self.scrollView.contentOffset.y += 3.5
}) { (completion) in
self.startScrollSlideShow(sliderValue: Float(UserDefaults.standard.string(forKey: "sliderValue")!)!)
}
} else {
return
}
}
#objc func scrollTextView(){
self.present(SliderViewController(title: "Otomatik Kaydırma"), animated: true, completion: nil)
// self.startScrollSlideShow(sliderValue: Float(UserDefaults.standard.string(forKey: "sliderValue")!)!)
}
these are in my main vc not my pop up vc.

Answer 1

You can use the delegate pattern for this:
protocol PlayViewDelegate: class {
func playButtonPressed()
}
// Implement the protocol in your Main VC
extension MainViewController: PlayViewDelegate {
func playButtonPressed() {
// Play
}
}
// Add delegate to the alert like VC
class PlayViewController: UIViewController {
weak var delegate: PlayViewDelegate?
#IBAction
func playPressed() {
self.delegate?.playButtonPressed()
self.dismiss(animated: true, completion: nil)
}
}