SwiftLog、XcodeのOutput出力であれば、バックエンド使わず、Extension追加で賄う

SwiftLog

https://github.com/apple/swift-log

Swift Packageです。

Extension

import Logging

extension Logger {
    static var level = Logger.Level.info

    init(function: String = #function) {
        self.init(label: function)
        self.logLevel = Logger.level
    }

    func trace(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.trace(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }

    func debug(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.debug(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }

    func info(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.info(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }

    func notice(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.notice(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }

    func warning(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.warning(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }

    func error(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.error(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }

    func critical(_ message: String = "" , function: String = #function, line: Int = #line) {
        self.critical(Logger.Message(stringLiteral: String("[\(function):\(line)] \(message)")))
    }
}

Example

import UIKit
import Logging

class ViewController: UIViewController {

    let logger = Logger()

    override func viewDidLoad() {
        super.viewDidLoad()
        logger.info()
        logger.info("start")
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