Easy way to log file name, function, and line number to Console using Unified Logging in Swift. See String format specifiers: https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html

os_log.swift

import os.log

os_log("[%{public}@/%{public}@:%{public}@] This is an error message", log: OSLog(subsystem: "my.system", category: "Networking"), type: OSLogType.error, ("\(#file)" as NSString).lastPathComponent, "\(#function)", "\(#line)")

// Alternatively use a global helper method

enum LogCategory: String {
    case `default` = "Default"
    case networking = "Networking"
}

func log(function: String = #function, file: String = #file, line: Int = #line, _ category: LogCategory = .default, _ type: OSLogType = .default, _ message: String) {
    os_log("[%{public}@/%{public}@:%{public}@] %{public}@", log: OSLog(subsystem: "my.system", category: category.rawValue), type: type, (file as NSString).lastPathComponent, function, "\(line)", message)
}