 
 // MARK: - Prefetching
 
-#if os(iOS)
 private final class PrefetchingDemoViewController: UICollectionViewController {
     private let prefetcher = ImagePrefetcher()
     private var photos: [URL] = []

        // Gets called when the download progress is updated.
    }
}


import Foundation
import Nuke

#if os(iOS)

import UIKit

private let pipeline = ImagePipeline.shared
private let url = URL(string: "https://example.com/image.jpeg")!
