EasyFont.swift

//
//  EasyFont.swift
//
//  Created by Rodolfo Antonici on 7/12/15.
//  Copyright © 2015 Rodolfo Antonici. All rights reserved.
//
/* Basicaly a font class that wraps the fonts weights and translate it to an Enum with a printable value and complements it with and San Francisco font class*/
/* To download the SF fonts go to: https://developer.apple.com/fonts/ */ 

import UIKit


// Beware that most fonts will _not_ have variants available in all these weights!
public enum FontWeight: CustomStringConvertible {
    case UltraLight
    case Thin
    case Light
    case Regular
    case Medium
    case SemiBold
    case Bold
    case Heavy
    case Black
    
    static func fontWeightFromFloat(weight: CGFloat) -> FontWeight {
        
        switch weight {
        case UIFontWeightUltraLight:
            return FontWeight.UltraLight
        case UIFontWeightThin:
            return FontWeight.Thin
        case UIFontWeightLight:
            return FontWeight.Light
        case UIFontWeightMedium:
            return FontWeight.Medium
        case UIFontWeightSemibold:
            return FontWeight.SemiBold
        case UIFontWeightBold:
            return FontWeight.Bold
        case UIFontWeightHeavy:
            return FontWeight.Heavy
        case UIFontWeightBlack:
            return FontWeight.Black
        default:
            return FontWeight.Regular
        }

    }

    public var description: String {
        var weightString = "Regular"
        
        switch self {
        case UltraLight:
            weightString = "Ultralight"
        case Thin:
            weightString = "Thin"
        case Light:
            weightString = "Light"
        case Regular:
            weightString = "Regular"
        case Medium:
            weightString = "Medium"
        case SemiBold:
            weightString = "Semibold"
        case Bold:
            weightString = "Bold"
        case Heavy:
            weightString = "Heavy"
        case Black:
            weightString = "Black"
        }
        
        return weightString
    }
}

public extension UIFont {
    
    public class func sanFranciscoDisplayFontOfSize(fontSize: CGFloat, weight: CGFloat) -> UIFont? {
        
        return UIFont(name: "SF-UI-Display-\(FontWeight.fontWeightFromFloat(weight).description)", size: fontSize)
    }
    
    public class func sanFranciscoTextFontOfSize(fontSize: CGFloat, weight: CGFloat, italic: Bool) -> UIFont? {
        let italicString = italic ? "Italic" : ""
        
        return UIFont(name: "SF-UI-Text-\(FontWeight.fontWeightFromFloat(weight).description)\(italicString)", size: fontSize)
    }
}