Swift viewDidLoad() in second View Controller Scene not working - ios

Question

I'm a beginner at swift and Xcode, so this question may sound very simple.
I have two view controllers, connected by a segue. My first view controller scene runs code from the viewDidLoad() function, and then calls the .performSegue() function for the second view controller scene to get displayed.
But now, I want to run code in that new .swift file. viewDidLoad() doesn't seem to work, so how do I get around this problem? Where else could I put my code, or what function should it be in?
EDIT
// Show main menu
self.performSegue(withIdentifier: "MenuSegue", sender: self)
is how I am switching between view controllers. The buttons display, but anything I write in viewDidLoad() does not work
EDIT 2
My code for ViewController.swift:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var startScreen: UIStackView! // H2O start screen
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// Display start screen for 2 seconds before fading out
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2, execute: {
// Fade out start screen
UIView.animate(withDuration: 1, animations: {self.startScreen.alpha = 0})
// Wait 1 second from when start screen starts to fade out
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1, execute: {
// Show main menu
self.performSegue(withIdentifier: "MenuSegue", sender: self)
})
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
And for MenuViewController.swift:
import UIKit
class MenuViewController: UIViewController {
#IBOutlet weak var playButton: UIButton! // Play button
#IBOutlet weak var settingsButton: UIButton! // Settings button
#IBOutlet weak var volumeButton: UIButton! // Volume button
#IBOutlet weak var volumeStack: UIStackView! // Volume stack
#IBOutlet weak var volumePercentage: UILabel! // Volume percentage
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
print("Hello")
// Slowly display everything
playButton.alpha = 0
settingsButton.alpha = 0
volumeButton.alpha = 0
volumeStack.alpha = 0
// Fade out start screen
UIView.animate(withDuration: 1, animations: {self.playButton.alpha = 1; self.settingsButton.alpha = 1; self.volumeButton.alpha = 1; self.volumeStack.alpha = 1})
print("Hi")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func settings(_ sender: UIButton) {
// If the settings are hidden
if volumeButton.alpha == 0 {
// Rotate settings button to open settings
UIView.animate(withDuration: 0.5, animations: {sender.transform = CGAffineTransform(rotationAngle: .pi * -0.999)})
// Show extended settings
UIView.animate(withDuration: 0.5, animations: {self.volumeButton.alpha = 1})
}
else {
// Rotate settings button back to normal
UIView.animate(withDuration: 0.5, animations: {sender.transform = CGAffineTransform(rotationAngle: 0.0)})
// Hide extended settings
UIView.animate(withDuration: 0.5, animations: {self.volumeButton.alpha = 0})
}
}
#IBAction func volumeSlider(_ sender: UISlider) {
// Get slider value rounded to nearest 5
let value = round(sender.value / 5) * 5
// Set the value to nearest 5
sender.value = value
// Show volume percentage
volumePercentage.text = "\(Int(value))%"
}
#IBAction func playButton(_ sender: UIButton) {
// Hide all settings
settingsButton.alpha = 0
volumeButton.alpha = 0
volumeStack.alpha = 0
// Hide play button
sender.alpha = 0
}
}

Answer 1

Add your animation code inside viewWillAppear() method.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
//Add animation code here
}