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, and that therefore means that I want them to have them the same font size. What currently happens is (because they have different amounts of text) they end up shrinking to different font sizes.

Is there a way to make it so that after scaling, the label with the smallest font size is the standard font for all of the other labels.

Thanks.

could you provide screenshot with marks on it? not clearly understand what to you want to do. — Anton Novoselov, Mar 27 '18 at 18:23
Possible duplicate of [AutoLayout link two UILabels to have the same font size](https://stackoverflow.com/questions/20262156/autolayout-link-two-uilabels-to-have-the-same-font-size) — Nikaaner, Oct 14 '19 at 11:52

score 8 · Answer 1 · answered Mar 27 '18 at 18:52

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

Mickael Belhassen · Answer 2 · 2022-12-27T07:07:40.977

        let labels = mainContainer
            .arrangedSubviews
            .compactMap { $0 as? UILabel }

        let newFontsSize = labels.map { label in
            var fontSize = label.font.pointSize
            
            while label.isTruncated {
                fontSize -= 0.25
                label.font = label.font.withSize(fontSize)
            }

            return fontSize
        }

        if let smallestFontSize = newFontsSize.min() {
            labels.forEach { label in
                label.font = label.font.withSize(smallestFontSize)
            }
        }

And the extension:

extension UILabel {
    var isTruncated: Bool {
        frame.width < intrinsicContentSize.width
    }
}

Setting the same font size for different labels AFTER scaling

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