[Swift] iOS custom Logger for debugging

Logger.swift

//
//  Logger.swift
//
//  Created by 홍경표 on 2021/05/28.
//

import Foundation

final class Logger {
    
    enum LEVEL: String {
        case DEBUG  = "DEBUG"
        case INFO   = "INFO"
        case ERROR  = "ERROR"
        case FATAL  = "FATAL"
    }
    
    private init() {}
    
    fileprivate func logEvent(_ identifier: String, dateFormat: DateFormatter, content: String) {
        print("\(dateFormat.string(from: Date())): \(identifier) -> \(content)")
    }
    
    class func log(level: LEVEL, message: String, file: String = #file, function: String = #function, line: Int = #line) {
        
        let dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
        let dfmt = DateFormatter()
        dfmt.dateFormat = dateFormat
        
        let filename = file.split(separator: "/").last!
        
        print("[\(level.rawValue) \(dfmt.string(from: Date())) \(filename)(line:\(line))] \(message)")
    }
    
    class func debug(_ message: String, file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .DEBUG, message: message, file: file, function: function, line: line)
    }
    
    class func info(_ message: String, file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .INFO, message: message, file: file, function: function, line: line)
    }
    
    class func error(_ message: String, file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .ERROR, message: message, file: file, function: function, line: line)
    }
    
    class func fatal(_ message: String, file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .FATAL, message: message, file: file, function: function, line: line)
    }
    
    class func debug(_ format: String, _ arguments: CVarArg..., file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .DEBUG, message: String(format: format, arguments), file: file, function: function, line: line)
    }
    
    class func info(_ format: String, _ arguments: CVarArg..., file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .INFO, message: String(format: format, arguments), file: file, function: function, line: line)
    }
    
    class func error(_ format: String, _ arguments: CVarArg..., file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .ERROR, message: String(format: format, arguments), file: file, function: function, line: line)
    }
    
    class func fatal(_ format: String, _ arguments: CVarArg..., file: String = #file, function: String = #function, line: Int = #line) {
        log(level: .FATAL, message: String(format: format, arguments), file: file, function: function, line: line)
    }
}