UIFont Extension

Font.swift

typealias Font = UIFont
public extension Font {
    convenience init(_ family: FontFamily = .system, size: CGFloat = 17.0, weight: FontWeight = FontWeight.regular) {
        let descriptor: UIFontDescriptor
        
        if family == .system {
            descriptor = UIFont.systemFont(ofSize: size, weight: weight.value).fontDescriptor
        } else {
            var attributes: [String: AnyObject] = [:]
            attributes[UIFontDescriptorNameAttribute] = family.name as AnyObject
            attributes[UIFontWeightTrait] = weight.value as AnyObject
            descriptor = UIFontDescriptor(fontAttributes: attributes)
        }
        
        self.init(descriptor: descriptor, size: size)
    }
}

public enum FontWeight {
    case ultraLight
    case thin
    case light
    case regular
    case medium
    case semibold
    case bold
    case heavy
    case black
    
    var value: CGFloat {
        switch self {
        case .ultraLight: return UIFontWeightUltraLight
        case .thin: return UIFontWeightThin
        case .light: return UIFontWeightLight
        case .regular: return UIFontWeightRegular
        case .medium: return UIFontWeightMedium
        case .semibold: return UIFontWeightSemibold
        case .bold: return UIFontWeightBold
        case .heavy: return UIFontWeightHeavy
        case .black: return UIFontWeightBlack
        }
    }
}

public enum FontFamily: String {
    case academyEngravedLET = "AcademyEngravedLET"
    case alNile = "AlNile"
    case americanTypewriter = "AmericanTypewriter"
    case appleColorEmoji = "AppleColorEmoji"
    case appleSDGothicNeo = "AppleSDGothicNeo"
    case arial = "Arial"
    case arialHebrew = "ArialHebrew"
    case arialRoundedMTBold = "ArialRoundedMTBold"
    case avenir = "Avenir"
    case avenirNext = "AvenirNext"
    case avenirNextCondensed = "AvenirNextCondensed"
    case banglaSangamMN = "BanglaSangamMN"
    case baskerville = "Baskerville"
    case bodoni72 = "Bodoni72"
    case bodoni72Oldstyle = "Bodoni72Oldstyle"
    case bodoni72Smallcaps = "Bodoni72Smallcaps"
    case bodoniOrnaments = "BodoniOrnaments"
    case bradleyHand = "BradleyHand"
    case chalkboardSE = "ChalkboardSE"
    case chalkduster = "Chalkduster"
    case cochin = "Cochin"
    case copperplate = "Copperplate"
    case courier = "Courier"
    case courierNew = "CourierNew"
    case damascus = "Damascus"
    case devanagariSangamMN = "DevanagariSangamMN"
    case didot = "Didot"
    case euphemiaUCAS = "EuphemiaUCAS"
    case farah = "Farah"
    case futura = "Futura"
    case geezaPro = "GeezaPro"
    case georgia = "Georgia"
    case gillSans = "GillSans"
    case gujaratiSangamMN = "GujaratiSangamMN"
    case gurmukhiMN = "GurmukhiMN"
    case heitiSC = "HeitiSC"
    case heitiTC = "HeitiTC"
    case helvetica = "Helvetica"
    case helveticaNeue = "HelveticaNeue"
    case hiraginoMinchoProN = "HiraginoMinchoProN"
    case hiraginoSans = "HiraginoSans"
    case hoeflerText = "HoeflerText"
    case kailasa = "Kailasa"
    case kannadaSangamMN = "KannadaSangamMN"
    case khmerSangamMN = "KhmerSangamMN"
    case kohinoorBangla = "KohinoorBangla"
    case kohinoorDevanagari = "KohinoorDevanagari"
    case kohinoorTelugu = "KohinoorTelugu"
    case laoSangamMN = "LaoSangamMN"
    case malayalamSangamMN = "MalayalamSangamMN"
    case markerFelt = "MarkerFelt"
    case menlo = "Menlo"
    case mishafi = "Mishafi"
    case myanmarSangamMN = "MyanmarSangamMN"
    case noteworthy = "Noteworthy"
    case optima = "Optima"
    case oriyaSangamMN = "OriyaSangamMN"
    case palatino = "Palatino"
    case papyrus = "Papyrus"
    case partyLET = "PartyLET"
    case pingFangHK = "PingFangHK"
    case pingFangSC = "PingFangSC"
    case pingFangTC = "PingFangTC"
    case savoyeLET = "SavoyeLET"
    case sinhalaSangamMN = "SinhalaSangamMN"
    case snellRoundhand = "SnellRoundhand"
    case symbol = "Symbol"
    case system = "SanFransisco"
    case tamilSangamMN = "TamilSangamMN"
    case teluguSangamMN = "TeluguSangamMN"
    case thonburi = "Thonburi"
    case timesNewRoman = "TimesNewRoman"
    case trebuchetMS = "TrebuchetMS"
    case verdana = "Verdana"
    case zapfDingbats = "ZapfDingbats"
    case zapfino = "Zapfino"
    
    var name: String {
        return self.rawValue
    }
    
    var validWeights: [FontWeight] {
        let fontWeights: [FontWeight]
        switch self {
        case .academyEngravedLET: fontWeights = [.regular]
        case .alNile: fontWeights = [.regular, .bold]
        case .americanTypewriter: fontWeights = [.regular, .light, .semibold, .bold]
        case .appleColorEmoji: fontWeights = [.regular]
        case .appleSDGothicNeo: fontWeights = [.regular, .bold, .ultraLight, .thin, .light]
        case .arial: fontWeights = [.regular]
        case .arialHebrew: fontWeights = [.regular, .bold, .light]
        case .arialRoundedMTBold: fontWeights = [.regular]
        case .avenir: fontWeights = [.regular, .light, .black, .heavy]
        case .avenirNext: fontWeights = [.regular, .ultraLight, .bold, .heavy]
        case .avenirNextCondensed: fontWeights = [.regular, .heavy, .ultraLight, .bold]
        case .banglaSangamMN: fontWeights = [.regular]
        case .baskerville: fontWeights = [.regular, .bold]
        case .bodoni72: fontWeights = [.regular, .bold]
        case .bodoni72Oldstyle: fontWeights = [.regular, .bold]
        case .bodoni72Smallcaps: fontWeights = [.regular]
        case .bodoniOrnaments: fontWeights = [.regular]
        case .bradleyHand: fontWeights = [.regular, .bold]
        case .chalkboardSE: fontWeights = [.regular, .bold, .light]
        case .chalkduster: fontWeights = [.regular]
        case .cochin: fontWeights = [.regular, .bold]
        case .copperplate: fontWeights = [.regular, .light, .bold]
        case .courier: fontWeights = [.regular, .bold]
        case .courierNew: fontWeights = [.regular]
        case .damascus: fontWeights = [.regular]
        case .devanagariSangamMN: fontWeights = [.regular, .bold]
        case .didot: fontWeights = [.regular, .bold]
        case .euphemiaUCAS: fontWeights = [.regular, .bold]
        case .farah: fontWeights = [.regular]
        case .futura: fontWeights = [.regular, .bold]
        case .geezaPro: fontWeights = [.regular, .bold]
        case .georgia: fontWeights = [.regular, .bold]
        case .gillSans: fontWeights = [.regular, .bold, .light]
        case .gujaratiSangamMN: fontWeights = [.regular, .bold]
        case .gurmukhiMN: fontWeights = [.regular, .bold]
        case .heitiSC: fontWeights = [.regular]
        case .heitiTC: fontWeights = [.regular]
        case .helvetica: fontWeights = [.regular, .bold, .light]
        case .helveticaNeue: fontWeights = [.regular, .bold, .ultraLight, .light, .thin]
        case .hiraginoMinchoProN: fontWeights = [.regular]
        case .hiraginoSans: fontWeights = [.regular]
        case .hoeflerText: fontWeights = [.regular, .black]
        case .kailasa: fontWeights = [.regular, .bold]
        case .kannadaSangamMN: fontWeights = [.regular, .bold]
        case .khmerSangamMN: fontWeights = [.regular]
        case .kohinoorBangla: fontWeights = [.regular, .semibold, .light]
        case .kohinoorDevanagari: fontWeights = [.regular, .light, .semibold]
        case .kohinoorTelugu: fontWeights = [.regular, .light]
        case .laoSangamMN: fontWeights = [.regular]
        case .malayalamSangamMN: fontWeights = [.regular, .bold]
        case .markerFelt: fontWeights = [.regular, .thin]
        case .menlo: fontWeights = [.regular, .bold]
        case .mishafi: fontWeights = [.regular]
        case .myanmarSangamMN: fontWeights = [.regular, .bold]
        case .noteworthy: fontWeights = [.regular, .light, .bold]
        case .optima: fontWeights = [.regular, .bold]
        case .oriyaSangamMN: fontWeights = [.regular, .bold]
        case .palatino: fontWeights = [.regular, .bold]
        case .papyrus: fontWeights = [.regular]
        case .partyLET: fontWeights = [.regular]
        case .pingFangHK: fontWeights = [.regular, .semibold, .thin, .light]
        case .pingFangSC: fontWeights = [.regular, .semibold, .thin, .light]
        case .pingFangTC: fontWeights = [.regular, .light, .semibold, .thin]
        case .savoyeLET: fontWeights = [.regular]
        case .sinhalaSangamMN: fontWeights = [.regular, .bold]
        case .snellRoundhand: fontWeights = [.regular, .bold, .black]
        case .symbol: fontWeights = [.regular]
        case .system: fontWeights = [.regular, .bold, .ultraLight, .light, .thin]
        case .tamilSangamMN: fontWeights = [.regular, .bold]
        case .teluguSangamMN: fontWeights = [.regular]
        case .thonburi: fontWeights = [.regular, .bold, .light]
        case .timesNewRoman: fontWeights = [.regular]
        case .trebuchetMS: fontWeights = [.regular, .bold]
        case .verdana: fontWeights = [.regular, .bold]
        case .zapfDingbats: fontWeights = [.regular]
        case .zapfino: fontWeights = [.regular]
        }
        return fontWeights
    }
}