Add glow effect to text of a UI button - swift - swift

Question

my question is quite straight forward. I am aiming to add a basic glow effect to a button in swift. I want the text to glow, not the entire button box.
I have attached an image as an example to illustrate what I am aiming to achieve.
I have looked elsewhere but typically only find animations which is not what I want. Sorry the image is of poor quality.
I am currently using this code but my settings button appears with a very weak glow, how can I make it stronger:
import UIKit
extension UIView {
enum GlowEffect: Float {
case small = 0.4, normal = 2, big = 30
}
func doGlowAnimation(withColor color: UIColor, withEffect effect: GlowEffect = .normal) {
layer.masksToBounds = false
layer.shadowColor = color.cgColor
layer.shadowRadius = 0
layer.shadowOpacity = 1
layer.shadowOffset = .zero
let glowAnimation = CABasicAnimation(keyPath: "shadowRadius")
glowAnimation.fromValue = 20 // effect.rawValue
glowAnimation.toValue = 20
glowAnimation.fillMode = .removed
glowAnimation.repeatCount = .infinity
layer.add(glowAnimation, forKey: "shadowGlowingAnimation")
}
}
Changing the intensity doesn't give that strong color effect near the individual letters

Answer 1

To create an outer glow effect on the title of a UIButton you'll want to make sure you adjust the shadow properties of the UIButton's titleLabel. Meaning you could run your animation by saying:
button.titleLabel?.doGlowAnimation(withColor: UIColor.yellow)
The animation adjusts shadowRadius though currently goes from 20 to 20 so there's no actual animation.
extension UIView {
enum GlowEffect: Float {
case small = 0.4, normal = 2, big = 30
}
func doGlowAnimation(withColor color: UIColor, withEffect effect: GlowEffect = .normal) {
layer.masksToBounds = false
layer.shadowColor = color.cgColor
layer.shadowRadius = 0
layer.shadowOpacity = 0.8
layer.shadowOffset = .zero
let glowAnimation = CABasicAnimation(keyPath: "shadowRadius")
glowAnimation.fromValue = 0
glowAnimation.toValue = effect.rawValue
glowAnimation.fillMode = .removed
glowAnimation.repeatCount = .infinity
glowAnimation.duration = 2
glowAnimation.autoreverses = true
layer.add(glowAnimation, forKey: "shadowGlowingAnimation")
}
}
Provides a pulsating outer glow, growing over the course of two seconds then reversing.