let textView = UITextView()
let string = NSMutableAttributedString()

// dynamic fonts
string.appendHeadline("Life can rise,\n")

    // call chaining
    .appendFootnote("it can fall.\n\n")

    // color, underline, strike through, superscript and others
    .append("But in the end\nit's just carried ", color: .white)
    .append("with the wind\n", 
        color: .yellow,
        font: .dynamic(.systemFont(ofSize: 10)),
        baselineOffset: 5)
    .append("and one day everything you do will simply cease to be…\n\n",
        color: .green, 
        underlineStyle: .styleDouble)
    .append("Like a child's ", color: .white)

    // and even images
    .append(image: UIImage(named: "balloon")!,
        height: UIFontMetrics.default.scaledValue(for: 20)) // (the image will not auto-adjust its height)

    // In specal cases use AttributesBuilder class for easier attributes set up
    .append("\n\nwhen it's lost, it's a tragic affair\n",
        withAttributes: AttributesBuilder()
                        .color(.white)
                        .shadow(offset: CGSize(width: 7, height: -5),
                                               blurRadius: 5, color: .yellow)
                        .outline(width: -2, color: .red)
                        .build())

    .append("- but it is quickly forgotten.", withAttributes:
        AttributesBuilder().strikeThrough(.styleSingle, color: .white).build())

textView.attributedText = string