Custom UIFont with font-family/font-weight/font-style/font-size by UIFontDescriptor

Custom-UIFont.swift

// Put font files to Xcode project.
// Add this properties to Info.plist:
//     Fonts provided by application
//         Item 0: SF-Pro-Display-Regular.otf
//         Item 1: SF-Pro-Display-Bold.otf
//         Item 2: ...

// Tips: To get the list of iOS SDK built-in fonts you can found on http://iosfonts.com
//       Or type "po [UIFont familyNames]" in Xcode lldb console.

// The following strings are Family names, not PostScript name or Full name.
let fonts = ["SF Pro Display", "Georgia", "Avenir Next", "Palatino"]

let fontIndex = 0
let fontBold = true
let fontItalic = true
let fontSize = 32


let descriptor = UIFontDescriptor(fontAttributes:
    [
        UIFontDescriptorFamilyAttribute: fonts[fontIndex],
        UIFontDescriptorTraitsAttribute: [
            UIFontWeightTrait: fontBold ? UIFontWeightBold : UIFontWeightRegular,
            UIFontSlantTrait: fontItalic ? 1.0 : 0.0
        ]
    ]
)

//    Another working implement:
//    let descriptor = UIFontDescriptor(name: "Avenir Next", size: 32).withSymbolicTraits([.traitBold, .traitItalic])

myUILabel.font = UIFont(descriptor: descriptor, size: fontSize)