Fade In Fade Out Animation

Question

Here is some code I struggle with for a while.

If you start the fade in animation, the label text fades in. If I start the fade out animation the the label text fades ou

Answer 1

Generic answer : You can use this method to apply animation to any UIView object . First create an extension of UIView class . Create a separate swift file and write the code like this

import Foundation
import UIKit

extension UIView {

    func fadeIn() {
        //Swift 2
        UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: {
            self.alpha = 1.0
        }, completion: nil)

        //Swift 3, 4, 5
        UIView.animate(withDuration: 1.0, delay: 0.0, options: UIView.AnimationOptions.curveEaseIn, animations: {
            self.alpha = 1.0
        }, completion: nil)
    }


    func fadeOut() {
        //Swift 2
        UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
            self.alpha = 0.0
        }, completion: nil)

        //Swift 3, 4, 5
        UIView.animate(withDuration: 1.0, delay: 0.0, options: UIView.AnimationOptions.curveEaseOut, animations: {
            self.alpha = 0.0
        }, completion: nil)
    }


}

Here self refers to any UIView you refer to . You can use buttons, labels etc to call these 2 methods .

Then in any other swift class you can call fadeIn() and fadeOut() like this :

self.yourUIObject.fadeIn()
self.yourUIObject.fadeOut()

This gives the desired effect of animation to any UIObject .