To create a folder in iOS app development, you can use the createDirectory() method of the FileManager class
let home = FileManager.default.homeDirectoryForCurrentUser let playgroundPath = "Documents/dev/xcode/DatePicker/c" // get your playground URL let playgroundURL = home.appendingPathComponent(playgroundPath) // First create a FileManager instance let fileManager = FileManager.default let path = playgroundURL.appendingPathComponent("test-directory").path do{ try fileManager.createDirectory(atPath: path, withIntermediateDirectories: true, attributes: nil) } catch { print("error") }