Created
May 16, 2019 13:31
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Shimmering views
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// | |
// UIView+Shimmer.swift | |
// SearchFlights | |
// | |
// Created by Jessy Hanzo on 16/05/2019. | |
// Copyright © 2019 jho. All rights reserved. | |
// | |
import Foundation | |
import UIKit | |
// inspired by https://github.com/AjayBhanushali/ABLoaderView | |
extension UIView { | |
public func startShimmering() { | |
self.layoutIfNeeded() | |
self.animate() | |
} | |
public func stopShimmering() { | |
self.layoutIfNeeded() | |
let layers = self.layer.sublayers?.filter({$0.name == "colorLayer" || $0.name == "loaderLayer"}) | |
layers?.forEach { $0.removeFromSuperlayer() } | |
} | |
private func animate() { | |
// Add Color Layer | |
let colorLayer = CALayer() | |
colorLayer.backgroundColor = UIColor(white: 0.82, alpha: 1).cgColor | |
colorLayer.frame = CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height) | |
colorLayer.name = "colorLayer" | |
self.layer.addSublayer(colorLayer) | |
self.autoresizesSubviews = true | |
self.clipsToBounds = true | |
// Add loader Layer | |
let gradientLayer = CAGradientLayer() | |
gradientLayer.colors = [ | |
UIColor(white: 0.82, alpha: 1).cgColor, | |
UIColor(white: 0.86, alpha: 1).cgColor, | |
UIColor(white: 0.82, alpha: 1).cgColor | |
] | |
gradientLayer.locations = [0,0.4,0.8, 1] | |
gradientLayer.name = "loaderLayer" | |
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5) | |
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5) | |
gradientLayer.frame = CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height) | |
self.layer.addSublayer(gradientLayer) | |
// Animate loader layer | |
let animation = CABasicAnimation(keyPath: "transform.translation.x") | |
animation.duration = 1.2 | |
animation.fromValue = -self.frame.width | |
animation.toValue = self.frame.width | |
animation.repeatCount = Float.infinity | |
gradientLayer.add(animation, forKey: "smartLoader") | |
} | |
} |
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