Fade In & Out Animation With The Same UIImageView - ios

Question

I want to know whether I can create any type of animation with the same UIImageView. Whenever the user clicks a button, it will change the photo using a fade in animation.
import UIKit
class ViewController: UIViewController {
var maximum: Int = 2
var number: Int = 0
var imageNames = ["0", "1"]
#IBOutlet weak var mainImage: UIImageView!
#IBOutlet weak var nextButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Gradient
nextButton.setGradientBackground(colorOne: UIColor(red:0.00, green:0.78, blue:1.00, alpha:1.0), colorTwo: UIColor(red:0.00, green:0.45, blue:1.00, alpha:1.0))
// Drop Shadows
nextButton.layer.shadowColor = UIColor.black.cgColor
nextButton.layer.shadowOffset = CGSize(width: 1, height: 1)
nextButton.layer.shadowRadius = 25
nextButton.layer.shadowOpacity = 0.10
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func changeImages(_ sender: Any) {
number = Int(arc4random_uniform(UInt32(maximum)))
mainImage.image = UIImage(named: "\(number).jpg")
}
}
There is no attempt of me trying to create an animation.
I was just hoping someone could help me create one.

Answer 1

you need to animate alpha value. make a fade in and fade out function like this :
func fadeIn(){
UIView.animate(withDuration: 3) {
self.my.alpha = 0.0
}
}
func fadeOut(){
UIView.animate(withDuration: 3.0) {
self.my.alpha = 1.0
}
}
Then use it when you change your image:
fadeIn()
changeImages() /* your change image logic without animation */
fadeOut()

Answer 2

You can try to animate the alpha
#IBAction func changeImages(_ sender: Any) {
number = Int(arc4random_uniform(UInt32(maximum)))
mainImage.image = UIImage(named: "\(number).jpg")
mainImage.alpha = 0
UIView.animate(withDuration: 1.5, animations: {
self.mainImage.alpha = 1
}
}