79 lines
1.9 KiB
Swift
79 lines
1.9 KiB
Swift
//
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// ArticleExtractorButton.swift
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 9/24/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import UIKit
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enum ArticleExtractorButtonState {
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case error
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case animated
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case on
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case off
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}
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class ArticleExtractorButton: UIButton {
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var buttonState: ArticleExtractorButtonState = .off {
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didSet {
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if buttonState != oldValue {
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switch buttonState {
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case .error:
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stripSublayer()
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setImage(AppAssets.articleExtractorError, for: .normal)
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case .animated:
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setImage(nil, for: .normal)
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setNeedsLayout()
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case .on:
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stripSublayer()
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setImage(AppAssets.articleExtractorOn, for: .normal)
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case .off:
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stripSublayer()
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setImage(AppAssets.articleExtractorOff, for: .normal)
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}
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}
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}
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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guard case .animated = buttonState else {
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return
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}
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stripSublayer()
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addAnimatedSublayer(to: layer)
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}
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private func stripSublayer() {
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if layer.sublayers?.count ?? 0 > 1 {
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layer.sublayers?.last?.removeFromSuperlayer()
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}
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}
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private func addAnimatedSublayer(to hostedLayer: CALayer) {
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let image1 = AppAssets.articleExtractorOffTinted.cgImage!
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let image2 = AppAssets.articleExtractorOnTinted.cgImage!
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let images = [image1, image2, image1]
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let imageLayer = CALayer()
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let imageSize = AppAssets.articleExtractorOff.size
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imageLayer.bounds = CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height)
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imageLayer.position = CGPoint(x: bounds.midX, y: bounds.midY)
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hostedLayer.addSublayer(imageLayer)
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let animation = CAKeyframeAnimation(keyPath: "contents")
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animation.calculationMode = CAAnimationCalculationMode.linear
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animation.keyTimes = [0, 0.5, 1]
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animation.duration = 2
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animation.values = images as [Any]
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animation.repeatCount = HUGE
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imageLayer.add(animation, forKey: "contents")
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}
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}
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