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September 9, 2017 03:14
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UIView+GlowBackground.swift
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// | |
// UIView+GlowBackground.swift | |
// GlowBackgroundView | |
// | |
// Created by Javier Loucim on 9/8/17. | |
// Copyright © 2017 Qeeptouch. All rights reserved. | |
// | |
import Foundation | |
import UIKit | |
private var UIViewGlowColorKey: UInt8 = 12 | |
extension UIView { | |
var glowBackground: UIColor? { | |
get { | |
return objc_getAssociatedObject(self, &UIViewGlowColorKey) as? UIColor | |
} | |
set { | |
objc_setAssociatedObject(self, &UIViewGlowColorKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN) | |
if let color = glowBackground { | |
addGlowView(color: color) | |
} | |
} | |
} | |
fileprivate func addGlowView(color:UIColor) { | |
self.backgroundColor = color | |
let variance:CGFloat = 0.3 | |
let gradient = CAGradientLayer() | |
var rgba = [CGFloat](repeating: 0.0, count: 4) | |
color.getRed(&rgba[0], green: &rgba[1], blue: &rgba[2], alpha: &rgba[3]) | |
let startColor = UIColor(red: max(rgba[0] + variance, 0.0), green: max(rgba[1] + variance, 0.0), blue: max(rgba[2] + variance, 0.0), alpha: rgba[3]) | |
let targetColor = UIColor(red: max(rgba[0] + variance, 0.0), green: max(rgba[1] + variance, 0.0), blue: max(rgba[2] + variance, 0.0), alpha:0.0) | |
gradient.frame = self.bounds | |
gradient.colors = [startColor.cgColor, targetColor.cgColor] | |
self.layer.insertSublayer(gradient, at: 0) | |
} | |
} |
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