Convert a string to UIImage by using UIGraphicsImageRenderer.

StringToImageConvert.swift

let string = "🤩"

let bounds = CGRect(x: 0, y: 0, width: 30, height: 30)
let image = UIGraphicsImageRenderer(size: bounds.size).image { context in

    let attributes: [NSAttributedString.Key: Any] = [
        .font: UIFont.preferredFont(forTextStyle: .body),
        .foregroundColor: UIColor.label
    ]

    let attributedString = NSAttributedString(string: string, attributes: attributes)

    attributedString.draw(with: bounds, options: .usesLineFragmentOrigin, context: nil)

}