124 lines
4.0 KiB
Swift
124 lines
4.0 KiB
Swift
//
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// BackgroundCircles.swift
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// PrivadoVPN
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//
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// Created by Lizaveta Malinouskaya on 6/18/21.
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// Copyright © 2021 Privado LLC. All rights reserved.
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//
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import UIKit
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public class BackgroundCircles: UIView {
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enum Constants {
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enum Geometry {
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static let viewHeight: CGFloat = 1250
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}
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enum Image {
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static let logo = "create.logo.dark"
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}
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}
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private var numberOfCircles: Int = 0
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private var multiplier: CGFloat = 0 {
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didSet {
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if multiplier <= 0 {
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multiplier = 1.20
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} else if multiplier < 1 {
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multiplier = abs(1 / multiplier)
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}
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setOffset()
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}
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}
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private var circlesAlpha: CGFloat = 0.04
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private var parent: UIView?
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private var circles: [UIView] = []
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private var circleRadiuses: [CGFloat] = []
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private var offset: CGFloat = 104
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init(numberOfCircles: Int = 5, multiplier: CGFloat = 1.2, alpha: CGFloat = 0.05) {
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super.init(frame: .zero)
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self.frame = CGRect(x: 0, y: 0, width: Constants.Geometry.viewHeight, height: Constants.Geometry.viewHeight)
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self.numberOfCircles = numberOfCircles
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self.multiplier = multiplier
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self.circlesAlpha = alpha
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configureUI()
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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private func configureUI() {
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setOffset()
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initializeRadiuses()
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for radius in circleRadiuses {
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circles.append(initializeGradientCircle(with: self, radius: radius, alpha: circlesAlpha))
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}
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self.layer.cornerRadius = self.bounds.height / 2
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for (circle, radius) in zip(circles, circleRadiuses) {
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NSLayoutConstraint.activate([
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circle.centerXAnchor.constraint(equalTo: self.centerXAnchor),
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circle.centerYAnchor.constraint(equalTo: self.centerYAnchor),
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circle.widthAnchor.constraint(equalToConstant: 2 * radius),
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circle.heightAnchor.constraint(equalToConstant: 2 * radius)
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])
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}
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let image = self.initializeLogoImage(with: self)
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NSLayoutConstraint.activate([
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image.centerXAnchor.constraint(equalTo: self.centerXAnchor),
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image.centerYAnchor.constraint(equalTo: self.centerYAnchor)
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])
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}
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private func initializeRadiuses() {
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var radius = self.bounds.height/2
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for _ in 0..<self.numberOfCircles {
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circleRadiuses.append(radius)
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radius = calculateNewRadius(of: radius, with: self.offset)
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}
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}
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private func initializeLogoImage(with container: UIView) -> UIImageView {
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let image = UIImage(imageLiteralResourceName: Constants.Image.logo)
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let view = UIImageView(image: image)
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view.translatesAutoresizingMaskIntoConstraints = false
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view.contentMode = .scaleAspectFit
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container.addSubview(view)
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return view
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}
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private func calculateNewRadius(of circleRadius: CGFloat, with offset: CGFloat) -> CGFloat {
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if circleRadius > offset {
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return (circleRadius - offset)
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} else {
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return 0
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}
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}
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private func setOffset() {
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offset = Constants.Geometry.viewHeight / 2 * (multiplier - 1) / multiplier
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}
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private func initializeGradientCircle(with container: UIView, radius: CGFloat, alpha: CGFloat) -> UIView {
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let gradientView = GradientView()
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gradientView.translatesAutoresizingMaskIntoConstraints = false
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gradientView.cornerRadius = radius
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gradientView.horizontalMode = false
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gradientView.stops = [
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.init(color: Colors.AnimationBackgrounds.loadingCircleTop.color, location: 0),
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.init(color: Colors.AnimationBackgrounds.loadingCircleBottom.color, location: 1)
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]
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gradientView.backgroundColor = .red
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gradientView.alpha = alpha
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container.addSubview(gradientView)
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return gradientView
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}
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}
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