iOS11のColor Setを使いたいので、UIColorにextensionを追加してみた ref: http://qiita.com/MTattin/items/c4031fb6c2799baf005c

file0.swift

extension UIColor {
    ///
    /// UIColor.init(named: String)がiOS11以降からしか使えないのでiOS10用処理
    ///
    static func Init(named: String) -> UIColor {
        if #available(iOS 11.0, *) {
            guard let _0_c: UIColor = UIColor.init(named: named) else {
                return UIColor.clear
            }
            return _0_c
        } else {
            switch named {
            case "Accent":     return #colorLiteral(red: 0.3490196078, green: 0.2431372549, blue: 0.9764705882, alpha: 1)
            case "Base":       return #colorLiteral(red: 0.01176470588, green: 0.662745098, blue: 0.9568627451, alpha: 1)
            case "BaseD1":     return #colorLiteral(red: 0.003921568627, green: 0.3411764706, blue: 0.6078431373, alpha: 1)
            case "BaseD1A080": return #colorLiteral(red: 0.003921568627, green: 0.3411764706, blue: 0.6078431373, alpha: 0.8)
            case "BaseD2":     return #colorLiteral(red: 0.007843137719, green: 0.5333333611, blue: 0.8196078539, alpha: 1)
            case "BaseL1":     return #colorLiteral(red: 0.8823529412, green: 0.9607843137, blue: 0.9960784314, alpha: 1)
            case "BaseL2":     return #colorLiteral(red: 0.5058823529, green: 0.831372549, blue: 0.9803921569, alpha: 1)
            case "Overlay":    return #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0.5)
            case "FontD1":     return #colorLiteral(red: 0.2588235294, green: 0.2588235294, blue: 0.2588235294, alpha: 1)
            case "FontD2":     return #colorLiteral(red: 0.4588235319, green: 0.4588235319, blue: 0.4588235319, alpha: 1)
            case "FontL1":     return #colorLiteral(red: 0.9333333373, green: 0.9333333373, blue: 0.9333333373, alpha: 1)
            case "FontL2":     return #colorLiteral(red: 0.741176486, green: 0.741176486, blue: 0.741176486, alpha: 1)
            default: return UIColor.clear
            }
        }
    }
}

file1.swift

UIColor.Init(named: "FontD1")

file2.swift

UIColor.Init(named: 

UIColor.init(named:

file3.swift

///
// MARK: ------------------------------ extension UIStoryboard
///
/// extension UIStoryboard
///
extension UIStoryboard {
    ///
    // MARK: ------------------------------ static method
    ///
    /// UIColor.init(named: String)がiOS11以降からしか使えないのでiOS10用処理
    ///
    static func IOS10(name: String, bundle: Bundle?) -> UIStoryboard {
        if #available(iOS 11.0, *) {
            return UIStoryboard(name: name, bundle: bundle)
        } else {
            return UIStoryboard(name: "\(name)iOS10", bundle: bundle)
        }
    }
}

file4.swift

let sb: UIStoryboard = UIStoryboard.IOS10(name: "StoryboardName", bundle: nil)