59 lines
1.7 KiB
Swift
59 lines
1.7 KiB
Swift
//
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// ImageCacheService.swift
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// EmployeeDirectory
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//
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// Created by Matt Bruce on 1/20/25.
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//
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import Foundation
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import UIKit
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public class ImageCacheService {
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public static let shared = ImageCacheService() // Default shared instance
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private let memoryCache = NSCache<NSString, UIImage>()
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private let fileManager = FileManager.default
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private let cacheDirectory: URL = {
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FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
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}()
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public init() {}
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public func loadImage(from url: URL) async -> UIImage? {
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let uniqueKey = url.uniqueIdentifier
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let cacheKey = uniqueKey as NSString
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if let cachedImage = memoryCache.object(forKey: cacheKey) {
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return cachedImage
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}
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let diskImagePath = cacheDirectory.appendingPathComponent(uniqueKey)
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if let diskImage = UIImage(contentsOfFile: diskImagePath.path) {
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memoryCache.setObject(diskImage, forKey: cacheKey)
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return diskImage
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}
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if let networkImage = await fetchFromNetwork(url: url) {
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memoryCache.setObject(networkImage, forKey: cacheKey)
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try? saveImageToDisk(image: networkImage, at: diskImagePath)
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return networkImage
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}
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return nil
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}
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private func fetchFromNetwork(url: URL) async -> UIImage? {
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do {
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let (data, _) = try await URLSession.shared.data(from: url)
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return UIImage(data: data)
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} catch {
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return nil
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}
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}
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private func saveImageToDisk(image: UIImage, at path: URL) throws {
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guard let data = image.pngData() else { return }
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try data.write(to: path)
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}
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}
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