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efrain |
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//
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// ImageLoader.swift
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// twogetskills
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//
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// Created by Efrain Yanez Recanatini on 3/9/22.
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//
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import Combine
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import UIKit
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class ImageLoader: ObservableObject {
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@Published var image: UIImage?
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private(set) var isLoading = false
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private let url: URL
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private var cache: ImageCache?
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private var cancellable: AnyCancellable?
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private static let imageProcessingQueue = DispatchQueue(label: "image-processing")
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init(url: URL, cache: ImageCache? = nil) {
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self.url = url
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self.cache = cache
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}
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deinit {
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cancel()
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}
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func load() {
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guard !isLoading else { return }
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if let image = cache?[url] {
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self.image = image
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return
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}
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let preference = Preference.sharedInstance
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let headerSecurity = HeaderSecurity()
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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request.addValue(preference.deviceUuid, forHTTPHeaderField: Constants.HTTP_HEADER_SECURITY_TOKEN)
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request.addValue(headerSecurity.secret, forHTTPHeaderField: Constants.HTTP_HEADER_SECURITY_SECRET)
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request.addValue(String(headerSecurity.created), forHTTPHeaderField: Constants.HTTP_HEADER_SECURITY_CREATED)
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request.addValue(String(headerSecurity.rand), forHTTPHeaderField: "Content-Type")
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cancellable = URLSession.shared.dataTaskPublisher(for: request)
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.map { UIImage(data: $0.data) }
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.replaceError(with: nil)
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.handleEvents(receiveSubscription: { [weak self] _ in self?.onStart() },
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receiveOutput: { [weak self] in self?.cache($0) },
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receiveCompletion: { [weak self] _ in self?.onFinish() },
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receiveCancel: { [weak self] in self?.onFinish() })
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.subscribe(on: Self.imageProcessingQueue)
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.receive(on: DispatchQueue.main)
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.sink { [weak self] in self?.image = $0 }
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}
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func cancel() {
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cancellable?.cancel()
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}
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private func onStart() {
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isLoading = true
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}
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private func onFinish() {
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isLoading = false
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}
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private func cache(_ image: UIImage?) {
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image.map { cache?[url] = $0 }
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}
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}
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