getting a NSTextField to grow with the text in auto layout?

Question

I\'m trying to get my NSTextField to have its height grow (much like in iChat or Adium) once the user types enough text to overflow the width of the control (as asked on thi

Answer 1

This solution also works when setting the string value of the text field and when it's resized by AutoLayout. It just uses the attributed text property to calculate the intrinsic content size whenever it's needed.

class AutoGrowingTextField: NSTextField {
    var maximumHeight: CGFloat = 100

    override var intrinsicContentSize: NSSize {
        let height = attributedStringValue.boundingRect(
            with: NSSize(width: bounds.width - 8, height: maximumHeight),
            options: [NSString.DrawingOptions.usesLineFragmentOrigin]
            ).height + 5

        return NSSize(width: NSView.noIntrinsicMetric, height: height)
    }

    override func textDidChange(_ notification: Notification) {
        super.textDidChange(notification)
        invalidateIntrinsicContentSize()
    }

    override func layout() {
        super.layout()
        invalidateIntrinsicContentSize()
    }
}