Resize font size to fill UITextView?

Question

How would I set the font size of text in a UITextView such that it fills the entire UITextView? I\'d like the user to type in their text, then have the text fill the entire

Answer 1

Hope that's clearer:

extension UITextView {
    @objc public func fitText() {
        fitText(into: frame.size)
    }

    @objc public func fitText(into originalSize: CGSize) {
        let originalWidth = originalSize.width
        let expectedSize = sizeThatFits(CGSize(width: originalWidth, height: CGFloat(MAXFLOAT)))

        if expectedSize.height > originalSize.height {
            while let font = self.font, sizeThatFits(CGSize(width: originalWidth, height: CGFloat(MAXFLOAT))).height > originalSize.height {
                self.font = font.withSize(font.pointSize - 1)
            }
        } else {
            var previousFont = self.font
            while let font = self.font, sizeThatFits(CGSize(width: originalWidth, height: CGFloat(MAXFLOAT))).height < originalSize.height {
                previousFont = font
                self.font = font.withSize(font.pointSize + 1)
            }
            self.font = previousFont
        }
    }
}