// Writes `data` to a file named `file`. func writeData(_ data: Data, to file: String) { let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentDirectoryURL.appendingPathComponent(file) try? data.write(to: fileURL) } // Removes file named `file`. func remove(file: String) { let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentDirectoryURL.appendingPathComponent(file) try? FileManager.default.removeItem(at: fileURL) } // Reads `Data` from a file named `file`. If the file doesn't exists returns `nil`. func readData(from file: String) -> Data? { let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let fileURL = documentDirectoryURL.appendingPathComponent(file) return try? Data(contentsOf: fileURL) } final class DiskCache<T>: CacheProtocol { func setValue(_ value: T?, forKey key: String) { } func getValue(forKey key: String) -> T? { } func fetchValue(forKey key: String, completion: @escaping (T?) -> Void) { } }

Companies where asked

Revolut