How to use a custom font with dynamic text sizes in iOS7

Question

In iOS7 there are new API\'s for getting a font that is automatically adjusted to the text size the user has set in their preferences.

It looks something like this to

Answer 1

This is how I do it in Swift. I like this because it's more general, it only requires one table, and it should work well with any font. First I wrote a generalized multiplier (in a getter).

var fontSizeMultiplier : CGFloat {
    get {
        switch UIApplication.sharedApplication().preferredContentSizeCategory {
        case UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: return 23 / 16
        case UIContentSizeCategoryAccessibilityExtraExtraLarge: return 22 / 16
        case UIContentSizeCategoryAccessibilityExtraLarge: return 21 / 16
        case UIContentSizeCategoryAccessibilityLarge: return 20 / 16
        case UIContentSizeCategoryAccessibilityMedium: return 19 / 16
        case UIContentSizeCategoryExtraExtraExtraLarge: return 19 / 16
        case UIContentSizeCategoryExtraExtraLarge: return 18 / 16
        case UIContentSizeCategoryExtraLarge: return 17 / 16
        case UIContentSizeCategoryLarge: return 1.0
        case UIContentSizeCategoryMedium: return 15 / 16
        case UIContentSizeCategorySmall: return 14 / 16
        case UIContentSizeCategoryExtraSmall: return 13 / 16
        default: return 1.0
        }
    }
}

Then I update the font (e.g., in the observer) using a UIFontDescriptor like this:

textView.font = UIFont(descriptor: fontDescriptor!, size: fontDescriptor!.pointSize * fontSizeMultiplier)