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

The solution of DouglasHeriot works great for me.

Here is the same code on Swift 4

class GrowingTextField: NSTextField {

    var editing = false
    var lastIntrinsicSize = NSSize.zero
    var hasLastIntrinsicSize = false

    override func textDidBeginEditing(_ notification: Notification) {
        super.textDidBeginEditing(notification)
        editing = true
    }

    override func textDidEndEditing(_ notification: Notification) {
        super.textDidEndEditing(notification)
        editing = false
    }

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

    override var intrinsicContentSize: NSSize {
        get {
            var intrinsicSize = lastIntrinsicSize

            if editing || !hasLastIntrinsicSize {

                intrinsicSize = super.intrinsicContentSize

                // If we’re being edited, get the shared NSTextView field editor, so we can get more info
                if let textView = self.window?.fieldEditor(false, for: self) as? NSTextView, let textContainer = textView.textContainer, var usedRect = textView.textContainer?.layoutManager?.usedRect(for: textContainer) {
                    usedRect.size.height += 5.0 // magic number! (the field editor TextView is offset within the NSTextField. It’s easy to get the space above (it’s origin), but it’s difficult to get the default spacing for the bottom, as we may be changing the height
                    intrinsicSize.height = usedRect.size.height
                }

                lastIntrinsicSize = intrinsicSize
                hasLastIntrinsicSize = true
            }

            return intrinsicSize
        }
    }
}