Get URL from Xcode asset catalogs

AssetExtractor.swift

import UIKit

//It basically just gets image from assets, saves its data to disk and return file URL.
class AssetExtractor {

    static func createLocalUrl(forImageNamed name: String) -> URL? {

        let fileManager = FileManager.default
        let cacheDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask)[0]
        let url = cacheDirectory.appendingPathComponent("\(name).png")

        guard fileManager.fileExists(atPath: url.path) else {
            guard
                let image = UIImage(named: name),
                let data = UIImagePNGRepresentation(image)
            else { return nil }

            fileManager.createFile(atPath: url.path, contents: data, attributes: nil)
            return url
        }

        return url
    }

}

Nice workaround 👏 I'd add a file type extension parameter defaulted in png.

/// Retrieves (or creates should it be necessary) a temporary image's local URL on cache directory for testing purposes
/// - Parameter name: image name retrieved from asset catalog
/// - Parameter imageExtension: Image type. Defaults to `.jpg` kind
/// - Returns: Resulting URL for named image
func createLocalUrl(forImageNamed name: String, imageExtension: String = "jpg") -> URL? {
    let fileManager = FileManager.default

    guard let cacheDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first else {
        print("Unable to access cache directory")
        return nil
    }

    let url = cacheDirectory.appendingPathComponent("\(name).\(imageExtension)")

    // If file doesn't exist, creates it
    guard fileManager.fileExists(atPath: url.path) else {
        // Bundle(for: Self.self) is used here instead of .main in order to work on test target as well
        guard let image = UIImage(named: name, in: Bundle(for: Self.self), with: nil),
              let data = image.jpegData(compressionQuality: 1) else {
            print("Impossible to convert to jpg data")
            return nil
        }

        fileManager.createFile(atPath: url.path, contents: data, attributes: nil)
        return url
    }

    return url
}

it is url to cache not to .xcassets catalog

it is url to cache not to .xcassets catalog

it is url to cache not to .xcassets catalog

it is url to cache not to .xcassets catalog

it is url to cache not to .xcassets catalog