Printing file name, function name, line number in Swift.

debug.swift

func log(_ items: Any...,
         withShortFileName: Bool = true,
         file: String = #file,
         function: String = #function,
         line: Int = #line)
{
    #if DEBUG
        var fileName: String = ""

        if withShortFileName {
            fileName = (file as NSString).lastPathComponent
        } else {
            fileName = file
        }

        print("\n########Debug Start########")
        print("Detail Info:")
        print("File: ", fileName)
        print("Function: ", function)
        print("Line: ", line)
        print("Detail:")
        print(items)
        print("########Debug End############ \n")
    #endif
}

/*
How to use:
let model = MyTreeViewModel()
log(model)

If you want a good-looking print result, you can try SwiftPrettyPrint
https://github.com/YusukeHosonuma/SwiftPrettyPrint
*/

/*

Display results

########Debug Start########
Detail Info:
File:  MainViewController.swift
Function:  tableView(_:cellForRowAt:)
Line:  135
Detail:
[
    data(
        id: 1,
        content: "Hello World"
    )
]
########Debug End############ 
*/