Setting the same font size for different labels AFTER scaling

Question

I am making an app where I have 3 labels. I am using label auto-shrinking to help adapt the label\'s font size to the device.

These labels are right next to each other,

Answer 1

Programatically change UIlabel font size after dynamic resizing. See the example below. Calculate current font size with length of string & font. And then get minimum font size and apply separately for each UILabel

override func viewWillAppear(_ animated: Bool) {
    let fontSize1 = self.label1.getFontSizeForLabel()
    let fontSize2 = self.label2.getFontSizeForLabel()
    let fontSize3 = self.label3.getFontSizeForLabel()

    let smallestFontSize = min(min(fontSize1, fontSize2), fontSize3)

    self.label1.font = self.label1.font.withSize(smallestFontSize)
    self.label2.font = self.label2.font.withSize(smallestFontSize)
    self.label3.font = self.label3.font.withSize(smallestFontSize)

    self.label1.adjustsFontSizeToFitWidth = false
    self.label2.adjustsFontSizeToFitWidth = false
    self.label3.adjustsFontSizeToFitWidth = false
}

UILabel Extension

extension UILabel {
    func getFontSizeForLabel() -> CGFloat {
        let text: NSMutableAttributedString = NSMutableAttributedString(attributedString: self.attributedText!)
        text.setAttributes([NSAttributedStringKey.font: self.font], range: NSMakeRange(0, text.length))
        let context: NSStringDrawingContext = NSStringDrawingContext()
        context.minimumScaleFactor = self.minimumScaleFactor
        text.boundingRect(with: self.frame.size, options: NSStringDrawingOptions.usesLineFragmentOrigin, context: context)
        let adjustedFontSize: CGFloat = self.font.pointSize * context.actualScaleFactor
        return adjustedFontSize
    }
}

Storyboard

Output