TextImage.swift

//: Playground - noun: a place where people can play

import UIKit

func createImage(text: String, fontSize: CGFloat, imageSize: CGSize) -> UIImage? {
    UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
    guard let context = UIGraphicsGetCurrentContext() else { return nil }
    
    let rect = CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height)
    
    // Fill background
    context.setFillColor(UIColor.white.cgColor)
    context.fill(rect)

    // Draw text
    let textStyle = NSMutableParagraphStyle()
    textStyle.alignment = .center
    let textFontAttributes = [
        NSFontAttributeName: UIFont.systemFont(ofSize: fontSize),
        NSForegroundColorAttributeName: UIColor.black,
        NSParagraphStyleAttributeName: textStyle
    ]
    let textRect = CGRect(x: 0, y: (rect.height - fontSize) / 2, width: rect.width, height: fontSize)
    text.draw(in: textRect, withAttributes: textFontAttributes)

    // Create image
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    
    return image
}

let image = createImage(text: NSDate().description, fontSize: 32, imageSize: CGSize(width: 512, height: 512))