Zhandos Bolatbekov
110 lines
3.3 KiB
Swift
110 lines
3.3 KiB
Swift
//
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// LoaderView.swift
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// Privado
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//
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// Created by Viktor on 29.06.2020.
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// Copyright © 2020 Privado LLC. All rights reserved.
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//
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import Foundation
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import UIKit
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final class LoaderView: UIView {
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static let shared = LoaderView(frame: .zero)
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private var loader: UIImageView?
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private var spinnerTask: DispatchWorkItem?
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private var currentAnimationStep = 0
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private enum Constants {
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static let loaderImageName = "navigation_loader"
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static let loaderSize: CGFloat = 120
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// see image named above in asset (it has 6 sectors)
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static let arcCount: Int = 6
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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self.setup()
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}
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@available(*, unavailable)
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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 infinteAnimation() {
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self.spinnerTask = DispatchWorkItem { [weak self] in
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guard let self = self else {
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return
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}
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self.loader?.transform = CGAffineTransform(rotationAngle: 2*CGFloat(self.currentAnimationStep%Constants.arcCount)*CGFloat.pi/CGFloat(Constants.arcCount))
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self.currentAnimationStep += 1
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self.infinteAnimation()
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}
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guard let task = self.spinnerTask else {
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return
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}
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DispatchQueue.main.asyncAfter(deadline: .now()+0.12, execute: task)
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}
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func startAnimation() {
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if self.loader == nil {
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let image = UIImage(imageLiteralResourceName: Constants.loaderImageName)
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self.loader = UIImageView(image: image)
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self.loader?.translatesAutoresizingMaskIntoConstraints = false
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guard let imageLoader = self.loader else {
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return
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}
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self.addSubview(imageLoader)
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NSLayoutConstraint.activate([
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imageLoader.centerXAnchor.constraint(equalTo: self.centerXAnchor),
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imageLoader.centerYAnchor.constraint(equalTo: self.centerYAnchor),
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imageLoader.widthAnchor.constraint(lessThanOrEqualToConstant: Constants.loaderSize),
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imageLoader.heightAnchor.constraint(lessThanOrEqualToConstant: Constants.loaderSize)
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])
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}
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if self.isHidden == true {
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self.spinnerTask?.cancel()
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}
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self.isHidden = false
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self.infinteAnimation()
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}
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func stopAnimation() {
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self.spinnerTask?.cancel()
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self.isHidden = true
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self.loader?.removeFromSuperview()
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self.loader = nil
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}
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private func setup() {
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self.backgroundColor = UIColor(rgb: 0x151935)
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self.alpha = 0.87
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self.translatesAutoresizingMaskIntoConstraints = false
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self.isHidden = true
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guard let window = UIApplication.shared.keyWindow else {
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return
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}
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window.addSubview(self)
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NSLayoutConstraint.activate([
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self.topAnchor.constraint(equalTo: window.topAnchor),
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self.bottomAnchor.constraint(equalTo: window.bottomAnchor),
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self.trailingAnchor.constraint(equalTo: window.trailingAnchor),
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self.leadingAnchor.constraint(equalTo: window.leadingAnchor)
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])
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}
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}
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