Override values from Info.plist while building the project

OverrideInfoPlist.swift

#!/usr/bin/env xcrun --sdk macosx swift

// Use this gist in order to write values in your Info.plist as a run phase
// Remember to add a custom Build Phase in your targets running this file as a first step

import Foundation

let relativePlistFilesFolder = "/YOUR_INFO_LIST_FOLDER/"

let currentDirectoryPath = FileManager.default.currentDirectoryPath

func readPlistFile(atPath path: String) -> [String : Any] {
    var plistData: [String : Any] = [:]
    
    guard let plistFileData = FileManager.default.contents(atPath: path) else {
        print("File doesn't exist")
        exit(1)
    }

    do {
        plistData = try PropertyListSerialization.propertyList(from: plistFileData,
                                                              options: [],
                                                              format: nil 
                                                              ) as! [String : Any]
    }
    catch {
        print("Error fetching list file")
    }

    return plistData
}

func writePlistFile(withData data: NSDictionary, atPath path: String) -> Bool {
    guard FileManager.default.fileExists(atPath: path) else {
        return false
    }

    return data.write(toFile: path, atomically: false)
}

// Create plist path and read data
let infoListPath =  currentDirectoryPath + relativePlistFilesFolder + "Info.plist"
var plistData: [String : Any] = readPlistFile(atPath: infoListPath)

// Replace the values you want
// Remember that the dictionary contains the raw key 
plistData["CFBundleVersion"] = 1 // Update existing values
plistData["YOUR_CUSTOM_KEY"] = "Value" // Add custom values

// Write data
if !writePlistFile(withData: plistData as NSDictionary, atPath: infoListPath) {
    print("Error writing list \(infoListPath)")
    exit(1)
}

exit(0)