How to use new San Francisco font in iOS 9?

In iOS 9 it is the system font, so you could do:

let font = UIFont.systemFontOfSize(18)

You can use the font name directly, but I don't think this is safe:

let font = UIFont(name: ".SFUIText-Medium", size: 18)!

You can also create the font with specific weight, like so:

let font = UIFont.systemFontOfSize(18, weight: UIFontWeightMedium)

or

let font = UIFont.systemFontOfSize(18, weight: UIFontWeightLight)

Swift 4

label.font = UIFont.systemFont(ofSize: 22, weight: UIFont.Weight.bold)

Details

• Xcode Version 10.2.1 (10E1001), Swift 5

Solution

import UIKitextension UIFont {    enum Font: String {        case SFUIText = "SFUIText"        case SFUIDisplay = "SFUIDisplay"    }    private static func name(of weight: UIFont.Weight) -> String? {        switch weight {            case .ultraLight: return "UltraLight"            case .thin: return "Thin"            case .light: return "Light"            case .regular: return nil            case .medium: return "Medium"            case .semibold: return "Semibold"            case .bold: return "Bold"            case .heavy: return "Heavy"            case .black: return "Black"            default: return nil        }    }    convenience init?(font: Font, weight: UIFont.Weight, size: CGFloat) {        var fontName = ".\(font.rawValue)"        if let weightName = UIFont.name(of: weight) { fontName += "-\(weightName)" }        self.init(name: fontName, size: size)    }}

Usage

guard let font = UIFont(font: .SFUIText, weight: .light, size: 14) else { return }// ...let font = UIFont(font: .SFUIDisplay, weight: .bold, size: 17)!