maximumContentSizeCategory in iOS 14

Question

In our recent project, we're trying to add Dynamic Text Sizing support. Our app is supporting iOS 14 and above.

In iOS 15, we can limit the text sizing using the property maximumContentSizeCategory and minimumContentSizeCategory.

label.maximumContentmSizeCategory = .accessibilityLarge

Question - What is the alternative of maximumContentSizeCategory and minimumContentSizeCategory in iOS 14?

Answer 1

Use UIApplication.shared.preferredContentSizeCategory to decide which preferredContentSizeCategory to use with UITraitCollection

Example:

func getPreferredFont(textStyle: UIFont.TextStyle, weight: UIFont.Weight? = nil) -> UIFont {
    let preferredContentSizeCategory: UIContentSizeCategory
    switch UIApplication.shared.preferredContentSizeCategory {
    case .extraSmall, .small, .medium:
        preferredContentSizeCategory = .large
    case .accessibilityExtraLarge, .accessibilityExtraExtraLarge, .accessibilityExtraExtraExtraLarge:
        preferredContentSizeCategory =  .accessibilityLarge
    default:
        preferredContentSizeCategory = UIApplication.shared.preferredContentSizeCategory
    }
    let traitCollection = UITraitCollection(preferredContentSizeCategory: preferredContentSizeCategory)
    let fontDescriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: textStyle, compatibleWith: traitCollection)
    let fontMetrics = UIFontMetrics(forTextStyle: textStyle)
    let font: UIFont
    if let weight = weight {
        font = UIFont.systemFont(ofSize: fontDescriptor.pointSize, weight: weight)
    } else {
        font = UIFont.systemFont(ofSize: fontDescriptor.pointSize)
    }
    return fontMetrics.scaledFont(for: font, maximumPointSize: fontDescriptor.pointSize, compatibleWith: traitCollection)
}