How to make a label fade in or out in swift

Question

I am looking to make a label fade in, in viewDidLoad(), and then after a timer is at 3 fade out. I am not familiar with the fadein or fadeout functions.

How would I go about doing this?

Answer 1

My suggestion is to leverage Swift extensions to make the code a bit more modular and easy to use. For example, if you want to make multiple labels fadein/out or one label to fade in/out on multiple views, you would have to pass the animateWithDuration methods everywhere, which can be a hassle. A cleaner alternative is to create a file called UIView.swift (our UIView extension). Add the following code to this file:

import Foundation

extension UIView {


func fadeIn(duration: NSTimeInterval = 1.0, delay: NSTimeInterval = 0.0, completion: ((Bool) -> Void) = {(finished: Bool) -> Void in}) {
    UIView.animateWithDuration(duration, delay: delay, options: UIViewAnimationOptions.CurveEaseIn, animations: {
        self.alpha = 1.0
        }, completion: completion)  }

func fadeOut(duration: NSTimeInterval = 1.0, delay: NSTimeInterval = 3.0, completion: (Bool) -> Void = {(finished: Bool) -> Void in}) {
    UIView.animateWithDuration(duration, delay: delay, options: UIViewAnimationOptions.CurveEaseIn, animations: {
        self.alpha = 0.0
        }, completion: completion)
}

}

Now you can add fadeIn/fadeout functionality to any child of UIView (e.g., UILabel, UIImage, etc). Inside of your viewDidLoad() function, you can add :

self.statusLabel.alpha = 0
self.statusLabel.text = "Sample Text Here"
self.myLabel.fadeIn(completion: {
        (finished: Bool) -> Void in
        self.myLabel.fadeOut()
        })

Now, you can use this sample code for Image views, labels, text views, scroll views, or any child of UIView as well. I hope this helps.