iOS Font Sizes

Below are the font and point sizes used by iOS at the default sizing level. You can read more, including about the accessibility curves, on Apple’s documentation.

.largeTitle 34.0 SFUIDisplay
.title1 28.0 SFUIDisplay (-Light ≤ iOS 10)
.title2 22.0 SFUIDisplay
.title3 20.0 SFUIDisplay
.headline 17.0 SFUIText-Semibold
.subheadline 15.0 SFUIText
.body 17.0 SFUIText
.callout 16.0 SFUIText
.footnote 13.0 SFUIText
.caption1 12.0 SFUIText
.caption2 11.0 SFUIText

Usage

Use preferredFont(forTextStyle:) or scaledFont(for:) with the UIFont.TextStyle constants instead of hard-coding font values in your code.

// update when the user changes their settings
label.adjustsFontForContentSizeCategory = true
label.font = UIFont.preferredFont(forTextStyle: .body)

You can use a modified version of the font with the same scaling:

// use a 16.0 font instead of 17.0 for body, at normal sizing
let adjustedFont = UIFont.systemFont(ofSize: 16.0, weight: .regular)

// use the scaled font version so it still updates automatically
label.adjustsFontForContentSizeCategory = true
label.font = UIFontMetrics(forTextStyle: .body).scaledFont(for: adjustedFont)

This will give you a body point with the default size at 16.0. To use a different font family, change the systemFont(ofSize:weight:) call.