*Accurately* calculating text height in Cocoa (for Mac, not iOS)

Question

How can I calculate the height of a string within a particular label (NSTextField), for some given fixed width?

I Googled up various methods and tried this method fr

Answer 1

This is ArtbyKGH's answer for Swift 4+:

extension NSTextField {
    func bestHeight(for text: String, width: CGFloat) -> CGFloat {
        stringValue = text
        let height = cell!.cellSize(forBounds: NSRect(x: 0, y: 0, width: width, height: .greatestFiniteMagnitude)).height

        return height
    }

    func bestWidth(for text: String, height: CGFloat) -> CGFloat {
        stringValue = text
        let width = cell!.cellSize(forBounds: NSRect(x: 0, y: 0, width: .greatestFiniteMagnitude, height: height)).width

        return width
    }
}