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59 lines
1.8 KiB
59 lines
1.8 KiB
//
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// File 2.swift
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//
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//
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// Created by Callum Trounce on 05/06/2019.
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//
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import Foundation
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import SwiftUI
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import Combine
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@available(iOS 13.0, *)
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class ImageLoader {
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static let shared = ImageLoader()
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private let fileManager = FileManager()
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private let cache = ImageCache()
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private lazy var session = URLSession.init(configuration: .default)
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public func load(url: URL, result: @escaping ((CGImage) -> Void)) {
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if let cachedImage = cache.image(for: url) {
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result(cachedImage)
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return
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}
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let request = session.downloadTask(with: url, completionHandler: { [weak self] (downloadLocation, response, error) in
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self?.handleDownload(response: response!, location: downloadLocation!, result: result)
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})
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request.resume()
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}
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func handleDownload(response: URLResponse, location: URL, result: @escaping ((CGImage) -> Void)) {
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guard let url = response.url else { return }
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do {
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let directory = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true).appendingPathComponent(location.lastPathComponent)
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try fileManager.copyItem(at: location, to: directory)
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guard
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let imageSource = CGImageSourceCreateWithURL(directory as NSURL, nil) else {
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fatalError("couldn't create image source")
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}
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guard let image = CGImageSourceCreateImageAtIndex(imageSource, 0, nil)
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else {
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fatalError("Couldn't load image \(directory)")
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}
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cache.store(image: image, for: url)
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result(image)
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} catch {
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fatalError(error.localizedDescription)
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}
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}
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}
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