write-string-on-image.swift

import AppKit

let currentDirectoryURL = URL(fileURLWithPath: FileManager.default.currentDirectoryPath)
let imageURL = URL(fileURLWithPath: "logo.png", relativeTo: currentDirectoryURL)

let args = ProcessInfo.processInfo.arguments

let appVersion = args[1]

func write(_ text: String, on image :NSImage) -> NSImage
{
    let font = NSFont.boldSystemFont(ofSize: 18)
    let imageRect = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)

    let textRect = CGRect(x: 5, y: 5, width: image.size.width - 5, height: image.size.height - 5)
    let textStyle = NSMutableParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
    let textFontAttributes = [
        NSAttributedString.Key.font: font,
        NSAttributedString.Key.foregroundColor: NSColor.white,
        NSAttributedString.Key.paragraphStyle: textStyle
    ]

    let im:NSImage = NSImage(size: image.size)

    let rep:NSBitmapImageRep = NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: Int(image.size.width), pixelsHigh: Int(image.size.height), bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false, colorSpaceName: NSColorSpaceName.calibratedRGB, bytesPerRow: 0, bitsPerPixel: 0)!

    im.addRepresentation(rep)

    im.lockFocus()

    image.draw(in: imageRect)
    text.draw(in: textRect, withAttributes: textFontAttributes)

    im.unlockFocus()

    return im
}



if let img = NSImage(contentsOf: imageURL.absoluteURL) {
    let img = write(appVersion, on: img)
    if let tiff = img.tiffRepresentation {
        do {
            let destUrl = URL(fileURLWithPath: "logo-\(appVersion).png", relativeTo: currentDirectoryURL)
            try tiff.write(to: destUrl)
        } catch let error {
            print("erro ao salvar imagem")
            print(error)
        }
    }
}