Swift macOS generate image previews of files on disk

generateImagePreview.swift

func generatePreview() {
    guard let fileURL = upload?.fileURL else { return }

    do {
        let values = try fileURL.resourceValues(forKeys: [URLResourceKey.typeIdentifierKey])

        if let type = values.typeIdentifier,
            UTTypeConformsTo(type as CFString, kUTTypeImage) {
            if let imageData = FileManager.default.contents(atPath: fileURL.path) {
                self.imagePreview.image = NSImage(data: imageData)
            }
        }
    }
    catch {
        Logger.error("Failed to lookup resource values")
    }
}

NSImage+QuickLook.swift

import AppKit
import QuickLook

extension NSImage {
    static func previewForFile(path fileURL: URL, ofSize size: CGSize, asIcon: Bool) -> NSImage? {
        
        let dict = [
            kQLThumbnailOptionIconModeKey: NSNumber(booleanLiteral: asIcon)
        ] as CFDictionary
        
        
        let ref = QLThumbnailImageCreate(kCFAllocatorDefault, fileURL as CFURL, size, dict)
        
        if let cgImage = ref?.takeUnretainedValue() {
            // Take advantage of NSBitmapImageRep's -initWithCGImage: initializer, new in Leopard,
            // which is a lot more efficient than copying pixel data into a brand new NSImage.
            // Thanks to Troy Stephens @ Apple for pointing this new method out to me.
            let bitmapImageRep = NSBitmapImageRep.init(cgImage: cgImage)
            let newImage = NSImage.init(size: bitmapImageRep.size)
            newImage.addRepresentation(bitmapImageRep)

            ref?.release()
            
            return newImage
        } else {
            // If we couldn't get a Quick Look preview, fall back on the file's Finder icon.
            let icon = NSWorkspace.shared.icon(forFile: fileURL.path)
            
            icon.size = size
            
            return icon
        }
    }
}

NSImage+QuickLook original taken from https://github.com/incbee/NSImage-QuickLook and ported to swift4

hi, any solution for swift?