Adding Glow Effect to Uibutton - iOS

Adding glow effect to UIButton - iOS

I suggest you use the Glow Category of UIView made by secret lab.

Example is available here

Glow effect to custom UIButton like info UIButton

I found an easy way to do as I want.
It's by enabling check mark of "Shows Touch On Highlight" property.
See the screenshot..

It's working fine for my custom buttons.

how to create UIButton shadow glow effect?

_closeButton.imageView.layer.cornerRadius = 7.0f; 
_closeButton.layer.shadowRadius = 3.0f; 
_closeButton.layer.shadowColor = [UIColor blackColor].CGColor;
_closeButton.layer.shadowOffset = CGSizeMake(0.0f, 1.0f); 
_closeButton.layer.shadowOpacity = 0.5f;
_closeButton.layer.masksToBounds = NO; 

check this

Need a Glowing Animation around a button

I had been working in your question and this is my results,I define a custom subclass of UIButton,adding a CABasicAnimation animating shadowRadius property, setting autoreverses to true and repeatCount to infinity

Code

//
//  GlowingButton.swift
//  NavigationButtonRotateQuestion
//
//  Created by Reinier Melian on 01/07/2017.
//  Copyright © 2017 Pruebas. All rights reserved.
//

import UIKit

@IBDesignable
class GlowingButton: UIButton {

    @IBInspectable var animDuration : CGFloat = 3
    @IBInspectable var cornerRadius : CGFloat = 5
    @IBInspectable var maxGlowSize : CGFloat = 10
    @IBInspectable var minGlowSize : CGFloat = 0
    @IBInspectable var glowColor : UIColor = nil ?? UIColor.red
    @IBInspectable var animateAlways : Bool = false
    fileprivate var animating : Bool = false

    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        self.contentScaleFactor = UIScreen.main.scale
        self.layer.masksToBounds = false

        if(self.animateAlways){
            self.setupButtonForContinueAnimation()
            self.startAnimation()
        }else{
            self.setupButton()
        }
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

        if(!self.animateAlways){
            let layerAnimation = CABasicAnimation(keyPath: "shadowRadius")
            layerAnimation.fromValue = minGlowSize
            layerAnimation.toValue = maxGlowSize
            layerAnimation.isAdditive = false
            layerAnimation.duration = CFTimeInterval(animDuration/2)
            layerAnimation.fillMode = CAMediaTimingFillMode.forwards
            layerAnimation.isRemovedOnCompletion = false
            self.layer.add(layerAnimation, forKey: "addGlowing")
        }
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

        if(!self.animateAlways){
            let layerAnimation = CABasicAnimation(keyPath: "shadowRadius")
            layerAnimation.fromValue = maxGlowSize
            layerAnimation.toValue = minGlowSize
            layerAnimation.isAdditive = false
            layerAnimation.duration = CFTimeInterval(animDuration/2)
            layerAnimation.fillMode = CAMediaTimingFillMode.forwards
            layerAnimation.isRemovedOnCompletion = false
            self.layer.add(layerAnimation, forKey: "removeGlowing")
        }
    }

    override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {

        if(!self.animateAlways){
            let layerAnimation = CABasicAnimation(keyPath: "shadowRadius")
            layerAnimation.fromValue = maxGlowSize
            layerAnimation.toValue = minGlowSize
            layerAnimation.isAdditive = false
            layerAnimation.duration = CFTimeInterval(animDuration/2)
            layerAnimation.fillMode = CAMediaTimingFillMode.forwards
            layerAnimation.isRemovedOnCompletion = false
            self.layer.add(layerAnimation, forKey: "removeGlowing")
        }
    }

    func setupButton()
    {
        self.layer.cornerRadius = cornerRadius
        self.layer.shadowPath = CGPath(roundedRect: self.bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius, transform: nil)
        self.layer.shadowRadius = 0
        self.layer.shadowColor = self.glowColor.cgColor
        self.layer.shadowOffset = CGSize.zero
        self.layer.shadowOpacity = 1
    }

    func setupButtonForContinueAnimation()
    {
        self.setupButton()
        self.layer.shadowRadius = maxGlowSize
    }

    func startAnimation()
    {
        let layerAnimation = CABasicAnimation(keyPath: "shadowRadius")
        layerAnimation.fromValue = maxGlowSize
        layerAnimation.toValue = minGlowSize
        layerAnimation.autoreverses = true
        layerAnimation.isAdditive = false
        layerAnimation.duration = CFTimeInterval(animDuration/2)
        layerAnimation.fillMode = CAMediaTimingFillMode.forwards
        layerAnimation.isRemovedOnCompletion = false
        layerAnimation.repeatCount = .infinity
        self.layer.add(layerAnimation, forKey: "glowingAnimation")

    }

    func stopAnimations() {
        self.layer.removeAllAnimations()
    }

}

Edited: Added Inspectable attributes for better customization

Edited: Adapted to swift4 and added func to stop animation

How can I add the 'Glow effect' to UIBarButtonItem?

You mean the effect you get when you touch an button? That is a property on an UIButton (also accessible from Interface Builder);

@property(nonatomic) BOOL showsTouchWhenHighlighted

So...

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.showsTouchWhenHighlighted = YES;

If you write a subclass of UIBarButtonItem and put this code in there somewhere it is really easy (and not messy) to re-use it. I'm not sure if there is any other way.

UIButton glow effect

You have to do this yourself. Load a glow png into a UIImageView and add it into the view hierarchy. Then set the view's position based on touches.

http://i.imgur.com/RS2kQ.png

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