Synchronised splash animation

ViewController.swift

//
//  ViewController.swift
//  splashanimation
//
//  Created by Muhammad Zeeshan on 05/04/2020.
//  Copyright © 2020 mzeeshanid. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet var imageView: UIImageView!
    @IBOutlet var loader: UIActivityIndicatorView!
        
    var images: [UIImage] = []
    
    var currentIndex: Int = 0
    
    var isScreenVisible: Bool = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        for i in 1..<7 {
            let imageName = "image_slice_" + "\(i)"
            let image = UIImage(named: imageName)!
            
            self.images.append(image)
        }
        
        
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
                
        self.isScreenVisible = true
        self.animateImageChange()
        self.loader.startAnimating()
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        self.isScreenVisible = false
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        
        self.loader.stopAnimating()
    }

    //MARK: My Methods
    
    func animateImageChange() {
        UIView.transition(with: self.imageView, duration: 1.8, options: .transitionCrossDissolve, animations: {
            self.imageView.image = self.images[self.currentIndex]
        }) { (finished) in
            if self.isScreenVisible {
                
                self.currentIndex += 1
                
                if self.currentIndex > (self.images.count - 1) {
                    self.currentIndex = 0
                }
                
                self.animateImageChange()
            }
        }
    }


}